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1. Catalytic behaviour of the Cu(i)/L/TEMPO system for aerobic oxidation of alcohols – a kinetic and predictive model

Author:
Afnan Al-Hunaiti; Batool Abu-Radaha; Darren Wraith; Timo Repo
Source:
RSC advances 2022 v.12 no.13 pp. 7864-7871
ISSN:
2046-2069
Subject:
acetonitrile; air; ambient temperature; catalytic activity; copper; data collection; imines; kinetics; ligands; models; oxidation
Abstract:
... Here, we disclose a new copper(i)-Schiff base complex series for selective oxidation of primary alcohols to aldehydes under benign conditions. The catalytic protocol involves 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO), N-methylimidazole (NMI), ambient air, acetonitrile, and room temperature. This system provides a straightforward and rapid pathway to a series of Schiff bases, particularly, the c ...
DOI:
10.1039/d1ra09359b

2. Development and evaluation of a semi-automatic single-step clean-up apparatus for rapid analysis of 18 antibiotics in fish samples

Author:
Shuhe Mu; Tengwang Teng; Ruidong Zhou; Huan Liu; Huiwu Sun; Jincheng Li
Source:
Journal of food composition and analysis 2022 v.113 pp. 104718
ISSN:
0889-1575
Subject:
acetonitrile; air; chemical species; filtration; fish; food composition; liquids; nitrogen; rapid methods; syringes; tandem mass spectrometry; trimethoprim
Abstract:
... Here we report a novel semi-automatic pre-treatment apparatus to fulfill a single-step clean-up aim for rapid quantification of 18 antibiotics in fish samples. Trimethoprim and 17 sulfonamides were extracted from fish samples by acetonitrile solution based on ultrasonic-assisted extraction. Cheap analytical filtration syringe (CAFS) clean-up column was used to fulfill single-step clean-up of the e ...
DOI:
10.1016/j.jfca.2022.104718

3. Oxidative Damage of Aliphatic Amino Acid Residues by the Environmental Pollutant NO₃·: Impact of Water on the Reactivity

Author:
Joses Grady Nathanael; Bing Yuan; Uta Wille
Source:
Environmental science & technology 2022 v.56 no.12 pp. 7687-7695
ISSN:
1520-5851
Subject:
acetonitrile; air; amino acids; density functional theory; dipeptides; electron transfer; hydrogen; moieties; nitrates; nitrogen dioxide; ozone; photolysis; protonation; technology
Abstract:
... The rate of oxidative damage of aliphatic amino acids and dipeptides by the environmental pollutant nitrate radical (NO₃·) in an aqueous acidic environment was studied by laser flash photolysis. The reactivity dropped by a factor of about four for amino acid residues with secondary amide bonds and by a factor of up to nearly 20 for amino acid residues with tertiary amide bonds, compared with that ...
DOI:
10.1021/acs.est.2c00863

4. Persistent Influence of Wildfire Emissions in the Western United States and Characteristics of Aged Biomass Burning Organic Aerosols under Clean Air Conditions

Author:
Ryan Farley; Noah Bernays; Daniel A. Jaffe; Damien Ketcherside; Lu Hu; Shan Zhou; Sonya Collier; Qi Zhang
Source:
Environmental science & technology 2022 v.56 no.6 pp. 3645-3657
ISSN:
1520-5851
Subject:
Siberia; acetonitrile; aerosols; air; biomass; carbon; climate; environmental science; furfural; oxidation; summer; technology; troposphere; wildfires
Abstract:
... Wildfire-influenced air masses under regional background conditions were characterized at the Mt. Bachelor Observatory (∼2800 m a.s.l.) in summer 2019 to provide a better understanding of the aging of biomass burning organic aerosols (BBOAs) and their impacts on the remote troposphere in the western United States. Submicron aerosol (PM₁) concentrations were low (average ± 1σ = 2.2 ± 1.9 μg sm–³), ...
DOI:
10.1021/acs.est.1c07301
CHORUS:
10.1021/acs.est.1c07301

5. Separation of Cr(VI), acetonitrile, and tetrahydrofuran from water using reducing sugars and HCl

Author:
Alicia Telepanich; Tatianna Marshall; Alejandro G. Marangoni; Erica Pensini
Source:
Water, air, and soil pollution 2022 v.233 no.3 pp. 70
ISSN:
0049-6979
Subject:
acetonitrile; air; discoloration; fructose; groundwater; hydrogen; industrial wastewater; pH; soil pollution; tetrahydrofuran; toxicity
Abstract:
... Acetonitrile (AN), tetrahydrofuran (THF), and Cr(VI) are toxic pollutants found in industrial wastewater and groundwater. The reducing sugar fructose separates AN and THF from water, at either neutral or acidic pH (pH = 4), either with or without Cr(VI) (as observed in bottle tests). This is because it preferentially hydrogen bonds water, inhibiting its interactions with AN and THF. When HCl is ad ...
DOI:
10.1007/s11270-022-05551-7

6. Accessing 14-Connected Nets: Continuous Breathing, Hydrophobic Rare-Earth Metal Organic Frameworks Based on 14-c Hexanuclear Clusters with High Affinity for Non-Polar Vapors

Author:
Edward Loukopoulos; Giasemi K. Angeli; Konstantinos Kouvidis; Constantinos Tsangarakis; Pantelis N. Trikalitis
Source:
ACS applied materials & interfaces 2022 v.14 no.19 pp. 22242-22251
ISSN:
1944-8252
Subject:
X-ray diffraction; acetonitrile; air; benzene; crystal structure; cyclohexanes; ethanol; hexane; hydrophobicity; sorption; vapors
Abstract:
... Highly connected metal organic frameworks (MOFs) in which at least one building block has connectivity higher than twelve are very rare and much desirable. We report here the first examples of isostructural 14-connected MOFs, RE-frt-MOF-1, constructed from the assembly of 14-c hexanuclear rare-earth clusters, [RE₆(μ₃-X)₈(COO)₁₂]²– (RE: Y³⁺, Tb³⁺, Dy³⁺, Ho³⁺, Er³⁺, Yb³⁺ and X: OH–/F–) with a tritop ...
DOI:
10.1021/acsami.2c05961

7. Appraisal of regional haze event and its relationship with PM2.5 concentration, crop residue burning and meteorology in Chandigarh, India

Author:
Khaiwal Ravindra; Tanbir Singh; Vinayak Sinha; Baerbel Sinha; Surender Paul; S.D. Attri; Suman Mor
Source:
Chemosphere 2021 v.273 pp. 128562
ISSN:
0045-6535
Subject:
acetonitrile; air; air pollution; air quality; biomass; industrialization; meteorology; organic carbon; pollution load; remote sensing; rice; stubble; urbanization; India; Indo-Gangetic Plain
Abstract:
... Air pollution affects not only the air quality in megacities but also in medium and small-sized cities due to rapid urbanization, industrialization, and other anthropogenic activities. From October 28, 2015 to November 3, 2015, the Indo-Gangetic Plains region, including Chandigarh encountered an episode of poor visibility during the daytime. The daily average PM₂.₅ concentration reached 191 μg/m³, ...
DOI:
10.1016/j.chemosphere.2020.128562

8. Liquid-phase hydrodechlorination of trichloroethylene driven by nascent H2 under an open system: Hydrogenation activity, solvent effect and sulfur poisoning

Author:
Weilai Wang; Fan Zhang; Yunfei Zhang; Lei Xu; Yuansheng Pei; Junfeng Niu
Source:
Journal of environmental sciences (China) 2021 v.108 pp. 96-106
ISSN:
1001-0742
Subject:
acetonitrile; air; catalysts; cathodes; dechlorination; hydrogen; hydrogenation; remediation; solvents; sulfur; surface water; trichloroethylene; China
Abstract:
... Hydrodechlorination is a promising technology for the remediation of water body contaminated with trichloroethylene (TCE). In this work, the liquid-phase hydrogenation of TCE by Raney Ni (R-Ni) and Pd/C under an open system have been studied, in which nascent H₂ (Nas-H₂) generated in situ from the cathode acted as a hydrogen source. Experimental results showed that TCE was completely eliminate fro ...
DOI:
10.1016/j.jes.2021.02.015

9. A New Method for Detecting Environmental Pollutant Sodium Pentachlorophenate (PCP-Na) Based on PAX Solid-Phase Extraction and UPLC-MS/MS

Author:
Lina Xin; Dingzhi Jiang; Feiyan Liang; Hongliang Zhang; Kai Wei; Jie Wang
Source:
Water, air, and soil pollution 2022 v.233 no.2 pp. 51
ISSN:
0049-6979
Subject:
acetonitrile; air; ceramics; chlorinated hydrocarbons; homogenizers; methanol; pentachlorophenol; pollutants; soil pollution; solid phase extraction; tandem mass spectrometry; water
Abstract:
... Pentachlorophenol (PCP) and sodium pentachlorophenate (PCP-Na) are both organochlorine pesticides. Excessive use of PCP-Na can cause water and soil pollution. In this study, a new method was established to verify the residual amount of PCP-Na in samples through the combination of PAX solid-phase extraction and ultra-high performance liquid chromatography-tandem mass spectrometry. The sample contai ...
DOI:
10.1007/s11270-022-05511-1

10. C[sbnd]H functionalization of (hetero)arenes: Direct selanylation mediated by Selectfluor

Author:
Andrei L. Belladona; Rodrigo Cervo; Diego Alves; Thiago Barcellos; Roberta Cargnelutti; Ricardo F. Schumacher
Source:
Tetrahedron letters 2020 v.61 no.26 pp. 152035
ISSN:
0040-4039
Subject:
acetonitrile; air; ambient temperature; aromatic hydrocarbons; oxidants; pyridines; selenides; thiazoles
Abstract:
... The direct selanylation of a diverse array of (hetero)arenes, including imidazo[2,1-b]thiazole, imidazo[1,2-a]pyridine, 1H-indole, 1H-pyrazole, isoxazole and naphthalen-2-ol is presented. The reactions are mediated by Selectfluor, as a stable, easy to handle and commercially available oxidant. The methodology features simple, mild and safe reaction conditions to produce non-symmetrical diorganyl s ...
DOI:
10.1016/j.tetlet.2020.152035

11. Dopant-Enriched Nitrogen Gas for Enhanced Electrospray Ionization of Released Glycans in Negative Ion Mode

Author:
Katarina Madunić; Sander Wagt; Tao Zhang; Manfred Wuhrer; Guinevere S.M. Lageveen-Kammeijer
Source:
Analytical chemistry 2021 v.93 no.18 pp. 6919-6923
ISSN:
1520-6882
Subject:
acetonitrile; air; analytical chemistry; chemical species; electrospray ionization mass spectrometry; ethanol; ionization; isopropyl alcohol; methanol; nitrogen; polysaccharides
Abstract:
... The desolvation and ionization process of analytes can significantly be improved by enriching the nebulizing gas with a dopant (dopant enriched nitrogen (DEN) gas) in the electrospray source. However, for the analysis of released glycans in negative ion mode, the usage of DEN gas remains largely unexplored. For this purpose, we investigated the effect of different polar protic solvents (methanol, ...
DOI:
10.1021/acs.analchem.1c00023

12. Humidity-robust scalable metal halide perovskite film deposition for photovoltaic applications

Author:
Carlo Andrea Riccardo Perini; Anil Reddy Pininti; Samuele Martani; Peter Topolovsek; Andrea Perego; Daniele Cortecchia; Annamaria Petrozza; Mario Caironi
Source:
Journal of materials chemistry A 2020 v.8 no.47 pp. 25283-25289
ISSN:
2050-7496
Subject:
acetonitrile; air; industrial applications; lead; methylamine; relative humidity; silicon; solar cells; solar energy; solvents
Abstract:
... Organic–inorganic perovskite photovoltaics have now achieved power conversion efficiencies at par with silicon devices on a lab-scale. To enable industrial application of the technology, developing a perovskite deposition route compatible with scalable, large-area deposition methods, which exploits safer processing solvents and is robust to variations of the processing parameters, particularly hum ...
DOI:
10.1039/d0ta05003b

13. Metal-Free Catalyst with Large Carbon Defects for Efficient Direct Overall Water Splitting in Air at Room Pressure

Author:
Qingyao Wu; Mengmeng Zhu; Jingjing Cao; Xiao Wang; Yang Liu; Chensheng Xiang; Mingwang Shao; He Tian; Zhenhui Kang
Source:
ACS applied materials & interfaces 2020 v.12 no.27 pp. 30280-30288
ISSN:
1944-8252
Subject:
acetonitrile; air; catalysts; clean energy; electric power; energy conversion; graphene; hydrogen; light; mixing; oxygen; photocatalysis; solar energy; topology
Abstract:
... Hydrogen can be used as a conventional clean energy resource, only by obtaining it in a cheap, simple, and feasible way. From the perspective of solar energy utilization, photocatalytic water splitting is essentially limited by high electric energy and intermittent solar energy. Here, we demonstrate that the carbon defects could decompose water directly by using low-value mechanical energy in the ...
DOI:
10.1021/acsami.0c02544

14. Sugaring-out: a novel sample preparation method for determination of fucoxanthin in Icelandic edible seaweeds

Author:
Yuetuan Zhang; Maonian Xu; Björn Viðar Aðalbjörnsson
Source:
Journal of applied phycology 2021 v.33 no.1 pp. 515-521
ISSN:
0921-8971
Subject:
Ascophyllum nodosum; Fucus vesiculosus; Saccharina; acetonitrile; air; algology; antioxidant activity; carotenoids; cell culture; freshness; glucose; macroalgae; markets; microalgae; phlorotannins; separation
Abstract:
... Fucoxanthin is an oxygenated carotenoid with a broad spectrum of bioactivities, ranging from antioxidant activity to antimicrobial activities. Micro-algae are well-recognized resources for their production of fucoxanthin, which can be enhanced by cell culture and genetic engineering, and macro-algae or seaweeds are readily available natural resources for harvesting and fucoxanthin purification. Pr ...
DOI:
10.1007/s10811-020-02321-y

15. A multicomponent palladium-catalyzed carbonylative approach to imidazopyridinyl-N,N-dialkylacetamides

Author:
Lucia Veltri; Patrizio Russo; Tommaso Prestia; Paola Vitale; Roberto Romeo; Bartolo Gabriele
Source:
Journal of catalysis 2020 v.386 pp. 53-59
ISSN:
0021-9517
Subject:
acetonitrile; air; catalytic activity; central nervous system; chemical bonding; gamma-aminobutyric acid; heterocyclic compounds; isomerization; oxidants; oxygen; palladium; secondary amines; solvents
Abstract:
... A novel, multicomponent approach to 2-(imidazo[1,2-a]pyridin-3-yl)-N,N-dialkylacetamides (very important class of fused heterocyclic derivatives, known to act on central nervous system by enhancing the activity of the GABA) is reported. It is based on the carbonylation reaction of N-Boc-(prop-2-yn-1-yl)pyridin-2-amines carried out in the presence of secondary amines (2–3 equiv) under oxidative con ...
DOI:
10.1016/j.jcat.2020.03.026

16. Barrier properties of anti-gas military garments, considering exposure to gas organic compounds

Author:
Pavel Otrisal; Karel Friess; Martin Urban; Simona Bungau; Delia Mirela Tit; Danut-Eugeniu Mosteanu; Zdenek Melicharik; Constantin Bungau; Lotfi Aleya
Source:
Science of the total environment 2020 v.714 pp. 136819
ISSN:
0048-9697
Subject:
acetonitrile; air; clothing; iso-octanes; permeability; permeameters; pollutants; polymers; solvents; toxic substances; vapors
Abstract:
... The problems of determining the protective properties of barrier materials used for the production of body surface protection products of an isolative type are very actual. These garments are expected to have long-term resistance against permeation of toxic substances. The paper deals with the study of the effect of organic solvent vapours on the changes in protective properties of selected anti-g ...
DOI:
10.1016/j.scitotenv.2020.136819

17. Denitrative thiocyanation of β-nitrostyrenes through visible light photoredox catalysis: An easy access to (E)-vinyl thiocyanates

Author:
Ritu Kapoor; Ruchi Chawla; Lal Dhar S. Yadav
Source:
Tetrahedron letters 2020 v.61 no.46 pp. 152505
ISSN:
0040-4039
Subject:
acetonitrile; air; ambient temperature; ammonium thiocyanate; catalytic activity; eosin; light; protocols; redox reactions; yields
Abstract:
... Eosin Y efficiently catalyzes the aerobic visible light mediated formation of sp² C-SCN bond through denitrative reaction of β-nitrostyrenes with ammonium thiocyanate in acetonitrile to afford (E)-vinyl thiocyanates in good to excellent yields. Metal-free conditions, use of sustainable resources (visible light and air) and ambient temperature are the exclusive attributes of the present protocol. ...
DOI:
10.1016/j.tetlet.2020.152505

18. Formation of highly porous electrochemically etched silicon carbide: A novel reusable adsorbent for air purification technology

Author:
Jaganathan Senthilnathan; Ambika Selvaraj; Jechan Lee; Ki-Hyun Kim; Masahiro Yoshimura
Source:
Journal of cleaner production 2019 v.218 pp. 521-528
ISSN:
0959-6526
Subject:
Raman spectroscopy; X-ray diffraction; acetonitrile; activated carbon; adsorbents; adsorption; air; atomic force microscopy; electrochemistry; formaldehyde; glutaraldehyde; models; porous media; silicon; silicon carbide; surface area; volatile organic compounds
Abstract:
... In this study, carbon-rich mesoporous silicon carbide (CRP-SiC: thickness of 1.3 μm and surface area of 77.3 m2/g) was obtained by electrochemical etching of polycrystalline SiC using HF/acetonitrile (1:5.6 ratio) at an optimum current density of 30 mA/cm2. The selective etching of Si from SiC was validated by Raman and X-ray diffraction analyses. High resolution-transmission electron microscope a ...
DOI:
10.1016/j.jclepro.2019.02.032

19. Ruthenium-Catalyzed Asymmetric Allylic Alkylation of Isatins

Author:
Barry M. Trost; Christopher A. Kalnmals; Divya Ramakrishnan; Michael C. Ryan; Rebecca W. Smaha; Sean Parkin
Source:
Organic letters 2020 v.22 no.7 pp. 2584-2589
ISSN:
1523-7052
Subject:
acetonitrile; air; alkylation; catalysts; catalytic activity; chemical structure; drugs
Abstract:
... A new ruthenium-based catalytic system for branched-selective asymmetric allylic alkylation is disclosed and applied to the synthesis of chiral isatin derivatives. The catalyst, which is generated in situ from commercially available CpRu(MeCN)₃PF₆ and a BINOL-derived phosphoramidite, is both highly active (TON up to 180) and insensitive to air and moisture. Additionally, the N-alkylated isatins ac ...
DOI:
10.1021/acs.orglett.0c00504

20. Acetonitrile contamination in the cathode of proton exchange membrane fuel cells and cell performance recovery

Author:
Yunfeng Zhai; Jean St-Pierre
Source:
Applied energy 2019 v.242 pp. 239-247
ISSN:
0306-2619
Subject:
acetonitrile; air; air flow; catalysts; catalytic activity; cathodes; dielectric spectroscopy; electrochemistry; electrolytes; fuel cells; hydrogen; nitrogen
Abstract:
... Acetonitrile contamination in an operating cell and performance recovery are investigated in detail by a series of electrochemical characterizations, including constant current operation, electrochemical impedance spectroscopy, cyclic voltammetry, linear scanning voltammetry and chronoamperometry. We demonstrate that 20 ppm of acetonitrile in the air stream causes an approximate 40% reduction in c ...
DOI:
10.1016/j.apenergy.2019.03.086

21. Atomically Precise Site-Specific Tailoring and Directional Assembly of Superatomic Silver Nanoclusters

Author:
Zhao-Yang Wang; Meng-Qi Wang; Yan-Ling Li; Peng Luo; Tong-Tong Jia; Ren-Wu Huang; Shuang-Quan Zang; Thomas C. W. Mak
Source:
Journal of the American Chemical Society 2018 v.140 no.3 pp. 1069-1076
ISSN:
1520-5126
Subject:
acetonitrile; air; crystallization; ligands; luminescence; nanoparticles; nanosilver; pyridines; silver
Abstract:
... Convenient generation of stable superatomic silver clusters and their systematic site-specific tailoring and directional assembly present an enduring and significant challenge. In this work, we prepared a face-centered cubic (fcc) array of Ag₁₄ superatoms protected by face-capping 1,2-dithiolate-o-carborane (C₂B₁₀H₁₀S₂) ligands, each produced from 1-thiol-o-carborane in crystallization with simult ...
DOI:
10.1021/jacs.7b11338

22. Coordinative Reduction of Metal Nodes Enhances the Hydrolytic Stability of a Paddlewheel Metal–Organic Framework

Author:
Dahae Song; Jinhee Bae; Hoon Ji; Min-Bum Kim; Youn-Sang Bae; Kyo Sung Park; Dohyun Moon; Nak Cheon Jeong
Source:
Journal of the American Chemical Society 2019 v.141 no.19 pp. 7853-7864
ISSN:
1520-5126
Subject:
acetonitrile; air; coordination polymers; copper; dissociation; electron transfer; geometry; hydroquinone; ions; oxidation; quinones
Abstract:
... Enhancement of hydrolytic stability of metal–organic frameworks (MOFs) is a challenging issue in MOF chemistry because most MOFs have shown limitations in their applications under a humid environment. Meanwhile, inner sphere electron transfer has constituted one of the most intensively studied subjects in contemporary chemistry. In this report, we show, for the first time, a new conceptual coordin ...
DOI:
10.1021/jacs.9b02114

23. Determination of six veterinary pharmaceuticals in egg by liquid chromatography: Chemometric optimization of a novel air assisted-dispersive liquid-liquid microextraction by solid floating organic drop

Author:
Carla M. Teglia; Lucia Gonzalo; María J. Culzoni; Héctor C. Goicoechea
Source:
Food chemistry 2019 v.273 pp. 194-202
ISSN:
0308-8146
Subject:
acetonitrile; air; albendazole; chemometrics; chloramphenicol; eggs; enrofloxacin; liquid chromatography; liquid-phase microextraction; methanol; methylene chloride; nicarbazin; pH; sodium phosphate; solidification; solvents; trimethoprim; veterinary drugs; zinc sulfate
Abstract:
... Two extraction strategies for albendazole, chloramphenicol, trimethoprim, enrofloxacin, oxitetracycline and nicarbazin in egg were optimized for its quantitation by liquid chromatography. First, two designs were built to find out the optimized condition for the air assisted-dispersive liquid-liquid microextraction based on solidification of organic drop: a fractional factorial and a central compos ...
DOI:
10.1016/j.foodchem.2017.08.034

24. Divergent Reactivity in Cuᴵᴵ-Catalyzed Oxidative Coupling between Indole/Tryptamine Derivatives and β-Arylacrylic Acids

Author:
Wei Cao; Jinbao Fan; Linyang Yan; Guangyao Zeng; Jinjin Ma; Yajing Wang; Yingjun Zhou; Xu Deng
Source:
Organic letters 2019 v.21 no.23 pp. 9506-9511
ISSN:
1523-7052
Subject:
acetonitrile; acids; air; catalytic activity; chemical structure; copper; cyclization reactions; oxidants; solvents; tryptamine
Abstract:
... Condition-controlled divergent oxidative coupling reactions between indole/tryptamine derivatives and β-arylacrylic acids with the catalysis of copper(II) have been developed. Specifically, a formal Michael addition/dehydration sequence between indoles and β-arylacrylic acids occurred in the presence of catalytic CuBr₂ in CH₃CN under air, thus affording highly functionalized 2,3-dihydro-1H-pyrrolo ...
DOI:
10.1021/acs.orglett.9b03697

25. Hydrophilic Interaction Liquid Chromatography-Tandem Mass Spectrometry Analysis of Fosetyl-Aluminum in Airborne Particulate Matter

Author:
Francesca Buiarelli; Patrizia Di Filippo; Carmela Riccardi; Donatella Pomata; Riccardo Marsiglia; Carla Console; Daniele Puri
Source:
Journal of Analytical Methods in Chemistry (Online) 2018 v.2018 pp. -
ISSN:
2090-8873
Subject:
Phytophthora; acetonitrile; air; exposure assessment; filters; fungicides; ionization; liquid chromatography; particulates; solid phase extraction; spraying; tandem mass spectrometry
Abstract:
... Fosetyl-aluminum is a synthetic fungicide administered to plants especially to prevent diseases caused by the members of the Peronosporales and several Phytophthora species. Herein, we present a selective liquid chromatography-tandem mass spectrometry (LC-MS/MS) method to analyze residues of fosetyl-A1 in air particulate matter. This study was performed in perspective of an exposure assessment of ...
DOI:
10.1155/2018/8792085
PubMed:
29686933
PubMed Central:
PMC5852886

26. Oxone®-mediated direct arylselenylation of imidazo[2,1-b]thiazoles, imidazo[1,2-a]pyridines and 1H-pyrazoles

Author:
Ingrid Rodrigues; Angelita M. Barcellos; Andrei L. Belladona; Juliano A. Roehrs; Roberta Cargnelutti; Diego Alves; Gelson Perin; Ricardo F. Schumacher
Source:
Tetrahedron 2018 v.74 no.31 pp. 4242-4246
ISSN:
0040-4020
Subject:
acetonitrile; air; chemical reactions; chemical structure; energy transfer; irradiation; oxidants; pyridines; solvents; thiazoles
Abstract:
... Oxone mediated reaction of imidazo[2,1-b]thiazole, imidazo[1,2-a]pyridine and 1H-pyrazole derivatives with diaryl diselenides is presented here. The methodology represents an efficient and simple protocol for carrying out the selective synthesis of 5-arylselanyl-imidazo[2,1-b]thiazoles, 3-arylselanyl-imidazo[1,2-a]pyridines and 4-arylselanyl-1H-pyrazoles in high yields using a stable, nontoxic and ...
DOI:
10.1016/j.tet.2018.06.046

27. Pyridazine-bridged cationic diiridium complexes as potential dual-mode bioimaging probes

Author:
Ruth E. Daniels; Luke K. McKenzie; Jonathan R. Shewring; Julia A. Weinstein; Valery N. Kozhevnikov; Helen E. Bryant
Source:
RSC advances 2018 v.8 no.18 pp. 9670-9676
ISSN:
2046-2069
Subject:
acetonitrile; air; electron microscopy; electrons; fluorescence; lethal dose 50; ligands; mitochondria; permeability; photochemotherapy; pyridines; singlet oxygen; solubility
Abstract:
... A novel diiridium complex [(N^C^N)₂Ir(bis-N^C)Ir(N^C^N)₂Cl]PF₆ (N^C^N = 2-[3-tert-butyl-5-(pyridin-2-yl)phenyl]pyridine; bis-N^C = 3,6-bis(4-tert-butylphenyl)pyridazine) was designed, synthesised and characterised. The key feature of the complex is the bridging pyridazine ligand which brings two cyclometallated Ir(iii) metal centres close together so that Cl also acts as a bridging ligand leading ...
DOI:
10.1039/c8ra00265g
PubMed:
31497293
PubMed Central:
PMC6688561

28. Simultaneous biomonitoring of 15 organophosphate flame retardants metabolites in urine samples by solvent induced phase transition extraction coupled with ultra-performance liquid chromatography-tandem mass spectrometry

Author:
Liqin Hu; Yun Tao; Dan Luo; Jingwen Feng; Limei Wang; Meng Yu; Yaping Li; Adrian Covaci; Surong Mei
Source:
Chemosphere 2019 v.233 pp. 724-732
ISSN:
0045-6535
Subject:
acetonitrile; additives; air; aqueous solutions; biomarkers; construction materials; detection limit; dust; environmental monitoring; esters; flame retardants; humans; hydrophobicity; hydroxylation; metabolites; organophosphorus compounds; phase transition; phosphates; plasticizers; products and commodities; separation; soil; solvents; standard deviation; tandem mass spectrometry; ultra-performance liquid chromatography; urine
Abstract:
... Organophosphate flame retardants and plasticizers (OPFRs) are widely additives in consumer products and building materials. They are frequently detected in environmental media, including indoor air, water, soil, and dust. To provide a low-cost and multi-target tool for monitoring individual exposure to OPFRs, a high-throughput method for simultaneous detection of 15 urinary OFPR metabolites was es ...
DOI:
10.1016/j.chemosphere.2019.05.242

29. The confined space electron transfer in phosphotungstate intercalated ZnAl-LDHs enhances its photocatalytic performance for oxidation/extraction desulfurization of model oil in air

Author:
Yingjie Cai; Hongyan Song; Zhe An; Xu Xiang; Xin Shu; Jing He
Source:
Green chemistry 2018 v.20 no.24 pp. 5509-5519
ISSN:
1463-9270
Subject:
acetonitrile; air; ambient temperature; desulfurization; electrochemistry; electron transfer; free radicals; fuels; green chemistry; models; oils; oxidants; oxidation; photocatalysis; photocatalysts; trapping; ultraviolet radiation
Abstract:
... Deep desulfurization of fuels is a hot issue in the environmental protection field in recent years. Phosphotungstate intercalated hydrotalcites (ZnAl-(PW₁₂O₄₀)ₓ-LDHs) with varying amounts of PW₁₂O₄₀³⁻ were prepared by an exfoliation-reassembly method, and their structures and properties were characterized by diverse techniques. The present process uses ZnAl-(PW₁₂O₄₀)ₓ-LDHs as the catalyst, air as ...
DOI:
10.1039/c8gc02284d

30. Acetonitrile from Bioethanol Ammoxidation: Process Design from the Grass-Roots and Life Cycle Analysis

Author:
Antonio Tripodi; Elnaz Bahadori; Daniele Cespi; Fabrizio Passarini; Fabrizio Cavani; Tommaso Tabanelli; Ilenia Rossetti
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.4 pp. 5441-5451
ISSN:
2168-0485
Subject:
acetonitrile; air; ammonia; ammonium bicarbonate; bioethanol; byproducts; carbon; carbon dioxide; catalysts; climate change; corn; cyanides; economic analysis; ecosystems; ethanol; fossils; life cycle assessment; lignocellulose; markets; nitrogen; nonrenewable resources; process design; raw materials; sugarcane; toxicity; wood
Abstract:
... The growing interest for new routes to obtain acetonitrile led to the development of catalysts active toward the ammoxidation of various substrates. Among these, a C2 molecule such as ethanol represents a good choice in terms of atom economy and, being renewable, sets the basis for a long-term sustainable process. This paper describes a fully integrated, newly designed process for the production o ...
DOI:
10.1021/acssuschemeng.8b00215

31. Acetonitrile-dependent oxyphosphorylation: A mild one-pot synthesis of β-ketophosphonates from alkenyl acids or alkenes

Author:
Xi Chen; Xiaolan Chen; Xu Li; Chen Qu; Lingbo Qu; Wenzhu Bi; Kai Sun; Yufen Zhao
Source:
Tetrahedron 2017 pp. -
ISSN:
0040-4020
Subject:
acetonitrile; air; alkenes; carboxylic acids; chemical reactions; chemical structure; copper sulfate; oxygen; synthesis
Abstract:
... An efficient one-pot synthesis of β-ketophosphonates has been developed, via the reaction of α,β-alkenyl carboxylic acids or alkenes with H-phosphonates and air oxygen, catalyzed by CuSO4·5H2O in CH3CN. CH3CN plays a decisive role, probably by forming an active oxygen complex [(MeCN)nCuII-O-O·]. ...
DOI:
10.1016/j.tet.2017.03.026

32. Automated sugaring-out liquid-liquid extraction based on flow system coupled with HPLC-UV for the determination of procainamide in urine

Author:
Lawrence Nugbienyo; Yulia Malinina; Sergei Garmonov; Mikhail Kamencev; Ilgiz Salahov; Vasil Andruch; Leonid Moskvin; Andrey Bulatov
Source:
Talanta 2017 pp. -
ISSN:
0039-9140
Subject:
acetonitrile; air; detection limit; glucose; high performance liquid chromatography; humans; liquid-liquid extraction; mixing; separation; urine
Abstract:
... A fully automated sugaring-out assisted liquid-liquid extraction procedure was suggested. The procedure was based on the separation of the acetonitrile phase, containing a target analyte from the homogeneous sample solution after injection of sugaring-out reagent (glucose) into a mixing chamber of the flow system. Air bubbling was used to promote the extraction process and phase separation. After ...
DOI:
10.1016/j.talanta.2017.02.051

33. Fast Orthogonal Separation by Superposition of Time of Flight and Field Asymmetric Ion Mobility Spectrometry

Author:
Alexander Bohnhorst; Ansgar T. Kirk; Marc Berger; Stefan Zimmermann
Source:
Analytical chemistry 2018 v.90 no.2 pp. 1114-1121
ISSN:
1520-6882
Subject:
acetonitrile; air; carbon dioxide; chlorides; chlorine; cyanogen; detection limit; explosives; hydrochloric acid; hydrogen cyanide; ionization; ions; nitrogen dioxide; phosphonates; spectrometers; spectroscopy; sulfur dioxide; toxic substances; tritium
Abstract:
... Ion mobility spectrometry is a powerful and low-cost technique for the identification of chemical warfare agents, toxic chemicals, or explosives in air. Drift tube ion mobility spectrometers (DT-IMS) separate ions by the absolute value of their low field ion mobility, while field asymmetric ion mobility spectrometers (FAIMS) separate them by the change of their ion mobility at high fields. However ...
DOI:
10.1021/acs.analchem.7b03200

34. Modular Construction of Photoanodes with Covalently Bonded Ru- and Ir-Polypyridyl Visible Light Chromophores

Author:
Chao Wang; Mona Amiri; Riley T. Endean; Octavio Martinez Perez; Samuel Varley; Ben Rennie; Loorthuraja Rasu; Steven H. Bergens
Source:
ACS applied materials & interfaces 2018 v.10 no.29 pp. 24533-24542
ISSN:
1944-8252
Subject:
X-ray photoelectron spectroscopy; acetonitrile; air; atomic absorption spectrometry; chemical bonding; hydroquinone; indium tin oxide; ligands; methylene chloride; nanoparticles; oxidation; semiconductors; solvents; sulfuric acid; titanium dioxide; triethylamine; ultraviolet-visible spectroscopy
Abstract:
... 1,10-phenanthroline is grafted to indium tin oxide (ITO) and titanium dioxide nanoparticle (TiO₂) semiconductors by electroreduction of 5-diazo-1,10-phenanthroline in 0.1 M H₂SO₄. The lower and upper potential limits (−0.20 and 0.15 VSCE, respectively) were set to avoid reduction and oxidation of the 1,10-phenanthroline (phen) covalently grafted at C5 to the semiconductor. The resulting semiconduc ...
DOI:
10.1021/acsami.8b06605

35. Surface Behavior of Aprotic Mixtures: Dimethyl Sulfoxide/Acetonitrile

Author:
Rodriguez Javier; Elola M. Dolores; Martí Jordi; Laria Daniel
Source:
The Journal of Physical Chemistry C 2017 v.121 no.27 pp. 14618-14627
ISSN:
1932-7455
Subject:
acetonitrile; air; chemical equilibrium; dimethyl sulfoxide; graphene; liquids; molecular dynamics; prediction; simulation models; vapors
Abstract:
... We present results from molecular dynamics simulations that examine microscopic characteristics of mixtures combining acetonitrile (ACN) and dimethyl sulfoxide (DMSO) at the vicinity of liquid/air and liquid/graphene interfaces. In the former interfaces, our simulations reveal a clear propensity of ACN to lie adjacent to the vapor phase at all concentrations. A simple model based on the considerat ...
DOI:
10.1021/acs.jpcc.7b03154

36. Tingkat Kelarutan Peptida Tempe dengan Bobot Molekul Kecil pada Berbagai Jenis Pelarut

Author:
Rusdah; Maggy Thenawidjaya Suhartono; Nurheni Sri Palupi; Masahiro Ogawa
Source:
Agritech 2018 v.37 no.3 pp. 327-333
ISSN:
2527-3825
Subject:
acetonitrile; air; beans; fermentation; molecular weight; non-genetically modified foods; peptides; solubility; soybeans; tempeh
Abstract:
... There are various methods exist to extract soluble peptide from soybean and its fermented products. This study was aimed to evaluate the solubility of low molecular weight peptide of tempe from two types of bean (GMO and non-GMO soybean) and two different treatment (boiling and non-boiling). The solvents used were water and organic solvents which commonly used as solvents for soy-fermented product ...
DOI:
10.22146/agritech.10697

37. A novel ditopic ring-expanded N-heterocyclic carbene ligand-assisted Suzuki-Miyaura coupling reaction in aqueous media

Author:
Emine Özge Karaca; Mitat Akkoç; Muhammad Nawaz Tahir; Cengiz Arıcı; Fatma İmik; Nevin Gürbüz; Sedat Yaşar; İsmail Özdemir
Source:
Tetrahedron letters 2017 pp. -
ISSN:
0040-4039
Subject:
Lewis acids; X-ray diffraction; acetonitrile; air; benzene; chemical reactions; chemical structure; chlorides; ligands; nuclear magnetic resonance spectroscopy; potassium carbonate
Abstract:
... A series of seven-membered ditopic ring-expanded N-heterocyclic carbene (dre-NHC) precursors, bearing sterically demanding and electron-rich aryl groups, were synthesised in moderate yields via the reaction of 1,2,4,5-tetrakis(bromomethyl)benzene with the corresponding N,N′-diarylformamidines in the presence of K2CO3 in acetonitrile under an air atmosphere. All new compounds were characterised by ...
DOI:
10.1016/j.tetlet.2017.07.096

38. Bioinspired aerobic oxidation of alcohols with a bifunctional ligand based on bipyridine and TEMPO

Author:
Lianyue Wang; Zhixing Bie; Sensen Shang; Ying Lv; Guosong Li; Jingyang Niu; Shuang Gao
Source:
RSC advances 2016 v.6 no.41 pp. 35008-35013
ISSN:
2046-2069
Subject:
acetonitrile; air; aldehydes; ambient temperature; catalysts; chemoselectivity; copper; free radicals; ketones; ligands; oxidation; solvents; ultraviolet-visible spectroscopy
Abstract:
... A novel bioinspired bifunctional ligand incorporating metal-binding site and stable free radical has been synthesized. The catalytic system obtained from the bifunctional ligand with copper(i) iodide in the presence of N-methylimidazole is highly efficient for the oxidation of a broad range of primary benzylic, allylic, alkynyl, aliphatic alcohols and secondary benzylic alcohols to the correspondi ...
DOI:
10.1039/c6ra05536b

39. Calculation and fabrication of two-dimensional complete photonic bandgap structures composed of rutile TiO2 single crystals in air/liquid

Author:
Sachiko Matsushita; Akihiro Matsutani; Yasushi Morii; Daito Kobayashi; Kunio Nishioka; Dai Shoji; Mina Sato; Tetsu Tatsuma; Takumi Sannomiya; Toshihiro Isobe; Akira Nakajima
Source:
Journal of materials science 2016 v.51 no.2 pp. 1066-1073
ISSN:
0022-2461
Subject:
absorbance; acetonitrile; air; chemists; crystals; electrolytes; infrared radiation; light; reflectance; refractive index; titanium dioxide; wavelengths
Abstract:
... Photoelectrochemical applications of photonic crystals are gathering great interests both from physicists and chemists. Here, we theoretically and experimentally present two-dimensional photonic bandgap (2D-PBG) structures based on rutile titanium dioxide (TiO₂) single crystal that is a famous material because of the photoelectrochemical ability. The structures were the arrays of hollow hexagonal ...
DOI:
10.1007/s10853-015-9436-8

40. Exposure to air boosts CuAAC reactions catalyzed by PEG-stabilized Cu nanoparticles

Author:
Fangyu Fu; Angel Martinez; Changlong Wang; Roberto Ciganda; Luis Yate; Ane Escobar; Sergio Moya; Eric Fouquet; Jaime Ruiz; Didier Astruc
Source:
Chemical communications 2017 v.53 no.39 pp. 5384-5387
ISSN:
1364-548X
Subject:
acetonitrile; air; catalysts; catalytic activity; chemical reactions; copper; copper nanoparticles; cuprous oxide
Abstract:
... New PEG-stabilized CuNP catalysts are designed upon Cu(ii) reduction with sodium naphthalenide in MeCN followed by simple purification using the salting-out effect. Their catalytic activity in CuAAC is boosted upon 30 min exposure to air, producing Cu₂O NPs. These NPs are also supported on SBA-15, providing excellent recyclable heterogeneous catalysts that are applied in low amounts for efficient ...
DOI:
10.1039/c7cc02504a

41. Simultaneous analysis of organochlorine pesticides and polychlorinated biphenyls in air samples by using accelerated solvent extraction (ASE) and solid-phase micro-extraction (SPME) coupled to gas chromatography dual electron capture detection

Author:
Haifaa Mokbel; Enaam Jamal Al Dine; Ahmad Elmoll; Céline Liaud; Maurice Millet
Source:
Environmental science and pollution research international 2016 v.23 no.8 pp. 8053-8063
ISSN:
0944-1344
Subject:
acetonitrile; air; detection limit; detectors; electrons; gas chromatography; organochlorine pesticides; polychlorinated biphenyls; regression analysis; samplers; solid phase microextraction; solvents; temperature
Abstract:
... An analytical method associating accelerated solvent extraction (ASE) and solid-phase micro-extraction (SPME) in immersion mode combined with gas chromatography dual electrons capture detectors (SPME-GC-2ECD) has been developed and studied for the simultaneous determination of 19 organochlorine pesticides (OCPs) and 22 polychlorinated biphenyls (PCBs) in air samples (active and XAD-2 passive sampl ...
DOI:
10.1007/s11356-016-6072-z

42. Vanadium pentoxide/carbide-derived carbon core–shell hybrid particles for high performance electrochemical energy storage

Author:
Marco Zeiger; Teguh Ariyanto; Benjamin Krüner; Nicolas J. Peter; Simon Fleischmann; Bastian J. M. Etzold; Volker Presser
Source:
Journal of materials chemistry A 2016 v.4 no.48 pp. 18899-18909
ISSN:
2050-7496
Subject:
Raman spectroscopy; X-ray diffraction; acetonitrile; air; carbon; chlorine; electrochemistry; electron microscopy; energy efficiency; nanopores; oxidation; specific energy; stable isotopes; vanadium
Abstract:
... A novel, two step synthesis is presented combining the formation of carbide-derived carbon (CDC) and redox-active vanadium pentoxide (V₂O₅) in a core–shell manner using solely vanadium carbide (VC) as the precursor. In a first step, the outer part of VC particles is transformed to nanoporous CDC owing to the in situ formation of chlorine gas from NiCl₂ at 700 °C. In a second step, the remaining VC ...
DOI:
10.1039/c6ta08900c

43. An efficient analytical method for determination of S-phenylmercapturic acid in urine by HPLC fluorimetric detector to assessing benzene exposure

Author:
Michele P. Rocha Mendes; Josianne Nicácio Silveira; Leiliane Coelho Andre
Source:
Journal of chromatography 2017 v.1063 pp. 136-140
ISSN:
1570-0232
Subject:
acetic acid; acetonitrile; air; alkaline hydrolysis; benzene; biomarkers; blood cells; byproducts; derivatization; detection limit; environmental exposure; fluorometry; high performance liquid chromatography; industry; nitrogen; petroleum; regression analysis; solid phase extraction; steel; urine
Abstract:
... Benzene is an important occupational and environmental contaminant, naturally present in petroleum and as by-product in the steel industry. Toxicological studies showed pronounced myelotoxic action, causing leukemic and others blood cells disorders. Assessing of benzene exposure is performed by biomarkers as trans, trans-muconic acid (AttM) and S-phenylmercapturic acid (S-PMA) in urine. Due to spe ...
DOI:
10.1016/j.jchromb.2017.07.039

44. A facile access to cis-dihydrofurobenzofuran from 2-(2,5-dihydro-furan-2-yl)-phenol

Author:
Xiao-Hui Hu; Xiao-Qiu Pu; Rui Liu; Chun-Xiao Cui; Jun Yang; Xian-Jin Yang
Source:
RSC advances 2016 v.6 no.63 pp. 58613-58616
ISSN:
2046-2069
Subject:
acetonitrile; air; catalysts; catalytic activity; chemical bonding; oxidants; palladium; solvents
Abstract:
... A facile access to cis-dihydrofurobenzofuran from a Pd-catalyzed intramolecular oxidative C–O bond formation of 2-(2,5-dihydro-furan-2-yl)-phenol is reported. The combined use of Pd(OAc)₂ as catalyst, acetonitrile as solvent and AgOAc or air as oxidant affords cis-dihydrofurobenzofurans in good (up to 83%) yields. ...
DOI:
10.1039/c6ra06840e

45. AC electric field for rapid assembly of nanostructured polyaniline onto microsized gap for sensor devices

Author:
Vera La Ferrara; Gabriella Rametta; Antonella Maria
Source:
Electrophoresis 2015 v.36 no.13 pp. 1459-1465
ISSN:
0173-0835
Subject:
acetonitrile; air; ammonia; dielectrophoresis; electric current; electric field; electrodes; electrophoresis; nanomaterials; prototypes; temperature
Abstract:
... Interconnected network of nanostructured polyaniline (PANI) is giving strong potential for enhancing device performances than bulk PANI counterparts. For nanostructured device processing, the main challenge is to get prototypes on large area by requiring precision, low cost and high rate assembly. Among processes meeting these requests, the alternate current electric fields are often used for nano ...
DOI:
10.1002/elps.201400550

46. Assessment of estrogenic activity in PM10 air samples with the ERE-CALUX bioassay: Method optimization and implementation at an urban location in Flanders (Belgium)

Author:
Kim Croes; Pieterjan Debaillie; Bo Van den Bril; Jeroen Staelens; Tara Vandermarken; Kersten Van Langenhove; Michael S. Denison; Martine Leermakers; Marc Elskens
Source:
Chemosphere 2016 v.144 pp. 392-398
ISSN:
0045-6535
Subject:
acetone; acetonitrile; air; animal ovaries; bioassays; carbon; cytotoxicity; endocrine-disrupting chemicals; estradiol; estrogenic properties; ethanol; glass fibers; heavy metals; hexane; humans; ovarian neoplasms; solvents; system optimization; traffic; Belgium
Abstract:
... Endocrine disrupting chemicals represent a broad class of compounds, are widespread in the environment and can pose severe health effects. The objective of this study was to investigate the overall estrogen activating potential of PM10 air samples at an urban location with high traffic incidence in Flanders, using a human in vitro cell bioassay.PM10 samples (n = 36) were collected on glass fiber f ...
DOI:
10.1016/j.chemosphere.2015.09.020

47. Base-Free Direct Synthesis of Alkynylphosphonates from Alkynes and H-Phosphonates Catalyzed by Cu2O

Author:
Moglie Yanina; Mascaró Evangelina; Gutierrez Victoria; Alonso Francisco; Radivoy Gabriel
Source:
Journal of organic chemistry 2016 v.81 no.5 pp. 1813-1818
ISSN:
1520-6904
Subject:
acetonitrile; additives; air; alkynes; cuprous oxide; ligands; moieties; organic chemistry; solvents
Abstract:
... A simple and mild methodology for the direct synthesis of alkynylphosphonates is presented. The reaction of a variety of terminal alkynes with dialkyl phosphites in the presence Cu₂O (14 mol %) led to the formation of the corresponding alkynylphosphonates in good to excellent yields. Reactions are performed under air, in acetonitrile as solvent, and in the absence of base or ligand additives. This ...
DOI:
10.1021/acs.joc.5b02528

48. Design and preparation of a polymer resin-supported organoselenium catalyst with industrial potential

Author:
Yuguang Wang; Lihua Yu; Bingchun Zhu; Lei Yu
Source:
Journal of materials chemistry A 2016 v.4 no.28 pp. 10828-10833
ISSN:
2050-7496
Subject:
acetonitrile; air; catalysts; cyclohexenes; hydrogen peroxide; oxidation; polymers; resins; selenium; solvents
Abstract:
... Hexavalent Se? Yes! Selenium on polymers exhibits quite different properties compared to that in small molecules. Hexavalent Se, rare in organoselenium chemistry, was found to be the major species on polymers. The high-valent Se species on recyclable polymer resins could quickly catalyze the oxidation reaction of cyclohexene with H₂O₂ in water to produce industrially important intermediate trans-1 ...
DOI:
10.1039/c6ta02566h

49. Molybdenum hexacarbonyl: air stable catalyst for microwave assisted intermolecular [2+2+2] co-trimerization involving propargyl halides

Author:
Sambasivarao Kotha; Gaddamedi Sreevani
Source:
Tetrahedron letters 2015 v.56 no.43 pp. 5903-5908
ISSN:
0040-4039
Subject:
acetonitrile; air; catalysts; chemical structure; cycloaddition reactions; halides; microwave radiation; microwave treatment; molybdenum; organic halogen compounds; solvents
Abstract:
... Intermolecular [2+2+2] cycloaddition of propargyl halides with 1,6-diynes was achieved with air stable, catalytic amount of Mo(CO)6 and the benzyl halide derivatives were isolated in good yields. The reaction conditions were optimized and better yields were observed under microwave irradiation conditions using acetonitrile as a solvent. ...
DOI:
10.1016/j.tetlet.2015.09.029

50. New electroactive and electrochromic aromatic polyamides with ether‐linked bis(triphenylamine) units

Author:
Sheng‐Huei Hsiao; Shou‐Lun Cheng
Source:
Journal of polymer science 2015 v.53 no.3 pp. 496-510
ISSN:
0887-624X
Subject:
acetonitrile; air; color; dicarboxylic acids; electrochemistry; electrolytes; glass; glass transition; nitrogen; oxidation; oxidative stability; phosphorylation; polyamides; silver chloride; solubility; solvents; temperature; weight loss
Abstract:
... A new class of electroactive polyamides with ether‐linked bis(triphenylamine) [O(TPA)₂] units were prepared through the direct phosphorylation polycondensation from N,N‐di(4‐aminophenyl)‐N′,N′‐diphenyl‐4,4′‐oxydianiline and aromatic dicarboxylic acids. These polyamides were amorphous with good solubility in many organic solvents, such as NMP and DMAc, and could be solution‐cast into strong and fle ...
DOI:
10.1002/pola.27465

51. Quasi-adiabatic vacuum-based column housing for very high-pressure liquid chromatography

Author:
Fabrice Gritti; Martin Gilar; Joseph A. Jarrell
Source:
Journal of chromatography 2016 v.1456 pp. 226-234
ISSN:
0021-9673
Subject:
acetonitrile; air; aluminum; enthalpy; friction; heat transfer; high performance liquid chromatography; ovens; prototypes; temperature profiles
Abstract:
... A prototype vacuum-based (10⁻⁶Torr) column housing was built to thermally isolate the chromatographic column from the external air environment. The heat transfer mechanism is solely controlled by surface radiation, which was minimized by wrapping the column with low-emissivity aluminum tape. The adiabaticity of the column housing was quantitatively assessed from the measurement of the operational ...
DOI:
10.1016/j.chroma.2016.06.029

52. Selective adsorption of thiophenic compounds from fuel over TiO2/SiO2 under UV-irradiation

Author:
Guang Miao; Feiyan Ye; Luoming Wu; Xiaoling Ren; Jing Xiao; Zhong Li; Haihui Wang
Source:
Journal of hazardous materials 2015 v.300 pp. 426-432
ISSN:
0304-3894
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; acetonitrile; active sites; adsorbents; adsorption; air; desulfurization; fuels; naphthalene; oxidation; silica; sorption isotherms; sulfur; titanium dioxide; washing
Abstract:
... This study investigates selective adsorption of thiophenic compounds from fuel over TiO2/SiO2 under UV-irradiation. The TiO2/SiO2 adsorbents were prepared and then characterized by N2 adsorption, X-ray diffraction and X-ray photoelectron spectroscopy. Adsorption isotherms, selectivity and kinetics of TiO2/SiO2 were measured in a UV built-in batch reactor. It was concluded that (a) with the employm ...
DOI:
10.1016/j.jhazmat.2015.07.027

53. Stable TEMPO and ABNO Catalyst Solutions for User-Friendly (bpy)Cu/Nitroxyl-Catalyzed Aerobic Alcohol Oxidation

Author:
Steves Janelle E.; Stahl Shannon S.
Source:
Journal of organic chemistry 2015 v.80 no.21 pp. 11184-11188
ISSN:
1520-6904
Subject:
acetonitrile; air; alcohols; catalysts; chemical structure; copper; organic chemistry; oxidation
Abstract:
... Two solutions, one consisting of bpy/TEMPO/NMI and the other bpy/ABNO/NMI (bpy =2,2′-bipyridyl; TEMPO = 2,2,6,6-tetramethylpiperidine N-oxyl, ABNO = 9-azabicyclo[3.3.1]nonane N-oxyl; NMI = N-methylimidazole), in acetonitrile are shown to have good long-term stability (≥1 year) under air at 5 °C. The solutions may be combined in appropriate quantities with commercially available [Cu(MeCN)₄]OTf to p ...
DOI:
10.1021/acs.joc.5b01950

54. Stereoisomers Identification and Storage Stability of Microencapsulated Marigold Lutein

Author:
Da-Jing Li; Jiang-Feng Song; Chun-Quan Liu
Source:
International journal of food properties 2015 v.18 no.1 pp. 178-185
ISSN:
1094-2912
Subject:
acetonitrile; air; correlation; food quality; lutein; methanol; methylene chloride; microencapsulation; models; stereoisomers; storage quality; storage time; vacuum packaging
Abstract:
... Stability of microencapsulated marigold lutein under three different storage conditions (dark and vacuum, light and vacuum, air and light) at 4, 20, and 37°C was investigated. Major lutein stereoisomers, including all-trans lutein, 13-cis lutein, 13′-cis lutein, 9-cis lutein, and 9′-cis lutein, were rapidly separated within 12 minutes by reverse-phase C ₃₀-HPLC-PDA using methanol, methylene chlori ...
DOI:
10.1080/10942912.2013.828748

55. Studies on an efficient method for determining ethyl carbamate in the workplace air

Author:
J. Kowalska; A. Jeżewska
Source:
International journal of environmental science and technology 2016 v.13 no.7 pp. 1833-1838
ISSN:
1735-1472
Subject:
acetonitrile; adsorption; air; cellulose; detection limit; ethyl carbamate; fluorescence; high performance liquid chromatography; human resources; occupational exposure; quantitative analysis; risk assessment; working conditions; Poland
Abstract:
... In relation to the proposal to introduce an occupational exposure limit value for ethyl carbamate (EC) in Poland, a need to develop a sensitive method for determination of this carcinogenic substance in the workplace air was emerged. In the presented paper, a new method for its determination by high-performance liquid chromatography (HPLC) with fluorescence detector (FLD) is proposed. The method i ...
DOI:
10.1007/s13762-016-1024-1

56. UV-induced reactions of Mg2+-doped anatase nanocrystals with exposed {001} facets: An EPR study

Author:
Zuzana Barbieriková; Dana Dvoranová; Maria-Veronica Sofianou; Christos Trapalis; Vlasta Brezová
Source:
Journal of catalysis 2015 v.331 pp. 39-48
ISSN:
0021-9517
Subject:
acetonitrile; air; cations; dispersions; electron paramagnetic resonance spectroscopy; fluorides; irradiation; nanocrystals; oxidation; sodium hydroxide; superoxide anion; titanium dioxide; washing
Abstract:
... The photoinduced processes of pristine and Mg²⁺-doped anatase nanopowders with the exposed {001} facets synthesized by a solvothermal method, using HF as the capping agent, were investigated by EPR spectroscopy. The adsorbed fluoride ions on the {001} facets of the as-prepared anatase samples have been removed by NaOH washing (washed samples) or calcination at 600°C (calcined samples). EPR spectra ...
DOI:
10.1016/j.jcat.2015.08.009

57. The Development and Validation of a Stability-Indicating UHPLC-DAD Method for Determination of Perindopril L-Arginine in Bulk Substance and Pharmaceutical Dosage Form

Author:
Magdalena Paczkowska; Przemysław Zalewski; Piotr Garbacki; Alicja Talaczyńska; Anna Krause; Judyta Cielecka-Piontek
Source:
Chromatographia 2014 v.77 no.21-22 pp. 1497-1501
ISSN:
0009-5893
Subject:
acetonitrile; air; angiotensin-converting enzyme inhibitors; arginine; cis-trans isomers; detection limit; drug formulations; formic acid; humidity; hydrolysis; oxidation; ultra-performance liquid chromatography; wavelengths
Abstract:
... A stability-indicating ultra-high-performance liquid chromatography (UHPLC) method with a diode array detector was developed and validated for the determination of cis/trans isomers of perindopril L-arginine in bulk substance and pharmaceutical dosage form. The separation was achieved on a Poroshell 120 Hilic (4.6 × 150 mm, 2.7 µm) column using a mobile phase composed of acetonitrile–0.1 % formic ...
DOI:
10.1007/s10337-014-2724-7
PubMed:
25400289
PubMed Central:
PMC4224746

58. Epoxidation of styrene over Fe(Cr)-MIL-101 metal–organic frameworks

Author:
Jian Sun; Guangli Yu; Qisheng Huo; Qiubin Kan; Jingqi Guan
Source:
RSC advances 2014 v.4 no.72 pp. 38048-38054
ISSN:
2046-2069
Subject:
acetonitrile; air; catalysts; catalytic activity; coordination polymers; epoxidation reactions; hydrogen peroxide; iron; metal ions; oxidants; solvents; styrene
Abstract:
... Epoxidation of styrene is one of the key reactions in organic synthesis. In this paper, we investigated the effect of different metal ions in MIL-101 metal–organic framework on styrene epoxidation using various oxidants such as air, H₂O₂ and TBHP. For the aerobic epoxidation of styrene, Fe-MIL-101 and Cr-MIL-101 presented good styrene conversion (87.2 vs. 65.5%) and epoxide selectivity (54.4% vs. ...
DOI:
10.1039/c4ra05402d

59. Inhalable Constituents of Thirdhand Tobacco Smoke: Chemical Characterization and Health Impact Considerations

Author:
Sleiman Mohamad; Logue Jennifer M.; Luo Wentai; Pankow James F.; Gundel Lara A.; Destaillats Hugo
Source:
Environmental Science & Technology 2014 v.48 no.22 pp. 13093-13101
ISSN:
1520-5851
Subject:
acetonitrile; acrolein; air; chronic exposure; cigarettes; disability-adjusted life year; furans; inhalation exposure; nicotine; particulates; pollutants; smoke; smoking (habit); sorption; tracer techniques; volatile organic compounds; California
Abstract:
... Tobacco smoke residues lingering in the indoor environment, also termed thirdhand smoke (THS), can be a source of long-term exposure to harmful pollutants. THS composition is affected by chemical transformations and by air–surface partitioning over time scales of minutes to months. This study identified and quantified airborne THS pollutants available for respiratory exposure, identified potential ...
DOI:
10.1021/es5036333

60. Long-Term Air-Stable n-Channel Organic Thin-Film Transistors Using 2,5-Difluoro-1,4-phenylene-bis{2-[4-(trifluoromethyl)phenyl]acrylonitrile}

Author:
Nagamatsu Shuichi; Oku Shinya; Kuramoto Kouji; Moriguchi Tetsuji; Takashima Wataru; Okauchi Tatsuo; Hayase Shuzi
Source:
ACS applied materials 2014 v.6 no.6 pp. 3847-3852
ISSN:
1944-8252
Subject:
acetonitrile; air; aldehydes; condensation reactions; semiconductors
Abstract:
... A long-term air-stable n-type organic semiconductor, 2,5-difluoro-1,4-phenylene-bis{2-[4-(trifluoromethyl)phenyl]acrylonitrile}, was synthesized by a high-yield simple procedure of Knoevenagel condensation with aldehyde and acetonitrile derivatives. A fabricated organic thin-film transistor (OTFT) using this compound exhibited good n-channel OTFT properties with a high electron mobility of 0.17 cm ...
DOI:
10.1021/am404549e

61. Molecular Characterization of Organosulfates in Organic Aerosols from Shanghai and Los Angeles Urban Areas by Nanospray-Desorption Electrospray Ionization High-Resolution Mass Spectrometry

Author:
Tao Shikang; Lu Xiaohui; Levac Nicole; Bateman Adam P.; Nguyen Tran B.; Bones David L.; Nizkorodov Sergey A.; Laskin Julia; Laskin Alexander; Yang Xin
Source:
Environmental Science & Technology 2014 v.48 no.18 pp. 10993-11001
ISSN:
1520-5851
Subject:
acetonitrile; aerosols; air; alkanes; electrospray ionization mass spectrometry; emissions; esterification; hygroscopicity; ionization; molecular weight; nitrogen; non-polar compounds; organic sulfur compounds; solvents; sulfates; sulfuric acid; surface tension; surfactants; toluene; urban areas; California; China
Abstract:
... Fine aerosol particles in the urban areas of Shanghai and Los Angeles were collected on days that were characterized by their stagnant air and high organic aerosol concentrations. They were analyzed by nanospray-desorption electrospray ionization mass spectrometry with high mass resolution (m/Δm = 100,000). Solvent mixtures of acetonitrile and water and acetonitrile and toluene were used to extrac ...
DOI:
10.1021/es5024674

62. Notizen: 3-Diethylamino-5-phenyl-1,2,4-dithiazolium-hexachlorodicuprat(II) und -tetrachlorocuprat(II), (dpd)2Cu2Cl6 und (dpd)2CuCl4 / 3-Diethylamino-5-phenyl-1,2,4-dithiazolium Hexachlorodicuprates(II) and Tetrachlorocuprates(II), (dpd)2Cu2Cl6 and (dpd)2CuCl4

Author:
Jürgen Hartung; Lothar Beyer; Vicente Fernández; David Tudela; Enrique Gutiérrez-Puebla
Source:
Zeitschrift für Naturforschung 2014 v.46 no.8 pp. 1113-1116
ISSN:
0932-0776
Subject:
X-radiation; acetonitrile; air; crystals
Abstract:
... (dpd)₂Cu₂Cl₆ has been prepared by the reaction of bis(1,1-diethyl-3-benzoyl-thioureato)-copper(II) with SOCl₂ in nitromethane. The brown air stable crystals were characterized by X-ray structure determination. Space group P2₁/n, Z = 4, 4222 observed unique reflexions, R = 0.053, Lattice dimensions (22 °C): a = 1336.4(2), b = 1677.2(9), c = 749.3(2) pm; β = 92.46(2)°. Similar reaction in acetonitri ...
DOI:
10.1515/znb-1991-0823

63. Palladium(II) in electrophilic activation of aldehydes and enones: efficient C-3 functionalization of indoles

Author:
Swapna Sarita Mohapatra; Priyabrata Mukhi; Anuradha Mohanty; Satyanarayan Pal; Aditya Omprakash Sahoo; Debjit Das; Sujit Roy
Source:
Tetrahedron letters 2015 v.56 pp. 5709-5713
ISSN:
0040-4039
Subject:
Lewis acids; acetonitrile; air; aldehydes; alkylation; ambient temperature; catalysts; chemical structure; indoles; ligands; palladium
Abstract:
... The regioselective C-3 alkylation of indoles with aldehydes and enones as electrophiles is catalyzed by a d8 late transition metal complex PdCl2(MeCN)2 at room temperature in the presence of air/moisture and in the absence of any additional acid/base, additive, or ligand. The active catalyst in this alkylation is an organometallic intermediate C1 which is formed from the reaction of indole with th ...
DOI:
10.1016/j.tetlet.2015.08.080

64. Pollution patterns in the upper troposphere over Europe and Asia observed by CARIBIC

Author:
Angela K. Baker; Sebastian Traud; Carl A.M. Brenninkmeijer; Peter Hoor; Marco Neumaier; David E. Oram; Armin Rauthe-Schöch; Detlev Sprung; Sebastian Schloegl; Franz Slemr; Peter F.J. van Velthoven; Heini Wernli; Andreas Zahn; Helmut Ziereis
Source:
Atmospheric environment 2014 v.96 pp. 245-256
ISSN:
1352-2310
Subject:
acetonitrile; air; aircraft; atmospheric chemistry; biofuels; biomass; burning; carbon monoxide; case studies; convection; emissions; fossil fuels; pollutants; propane; summer; troposphere; Central Asia; Eastern European region; Germany; India; Middle East; North America; Philippines; West Asia; Western European region
Abstract:
... Between May 2005 and March 2008 the CARIBIC (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container) observatory was deployed to make atmospheric observations on 42 flights between Frankfurt, Germany and Manila, the Philippines. This nearly 3 year flight series provides information about atmospheric composition in the upper troposphere over Europe and Asia ...
DOI:
10.1016/j.atmosenv.2014.06.010

65. Practical Cu(OAc)2/TEMPO-catalyzed selective aerobic alcohol oxidation under ambient conditions in aqueous acetonitrile

Author:
Jian-An Jiang; Jia-Lei Du; Zhan-Guo Wang; Zhong-Nan Zhang; Xi Xu; Gan-Lin Zheng; Ya-Fei Ji
Source:
Tetrahedron letters 2014 v.55 pp. 1677-1681
ISSN:
0040-4039
Subject:
acetonitrile; air; alcohols; aldehydes; ambient temperature; catalysts; chemical structure; copper; ketones; oxidants; oxidation; solvents
Abstract:
... We reported a ligand- and additive-free Cu(OAc)2/TEMPO catalyst system that enables efficient and selective aerobic oxidation of a broad range of primary and secondary benzylic alcohols, primary and secondary 1-heteroaryl alcohols, cinnamyl alcohols, and aliphatic alcohols to the corresponding aldehydes and ketones. This ambient temperature oxidation protocol is of practical features like aqueous ...
DOI:
10.1016/j.tetlet.2013.09.050

66. Preparation and characterization of MTiX for the catalytic oxidation of cyclohexane

Author:
A. Bellifa; A. Choukchou-Braham; C. Kappenstein; L. Pirault-Roy
Source:
RSC advances 2014 v.4 no.43 pp. 22374-22379
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; Lewis acids; X-ray diffraction; acetic acid; acetonitrile; adsorption; air; catalysts; catalytic activity; chromium; crystal structure; cyclohexanes; energy-dispersive X-ray analysis; liquids; oxidants; oxidation; pyridines; sol-gel processing; solvents; surface area; titanium dioxide; vanadium
Abstract:
... MTiX (M = Cr and V) samples, with 0, 5, 10 and 20 atomic percent, were synthesised by a sol–gel method and calcined at 400 °C in air. The XRD analysis results indicated that the materials presented a crystalline structure with the presence of TiO₂ anatase forms. BET analysis showed that the surface area varied with the variation of metal content. EDX analysis showed a heterogeneous distribution of ...
DOI:
10.1039/c4ra02241f

67. Synthese und Kristallstruktur von Tris(2,2'-bipyridin)eisen(II) μOxo-bis(trichloroeisen(III)), ein Salz mit dem Anion Fe2OCl62-

Author:
Herbert Weiss; Joachim Strähle
Source:
Zeitschrift für Naturforschung 2014 v.39 no.11 pp. 1453-1455
ISSN:
0932-0776
Subject:
acetonitrile; air; chlorine; crystal structure; crystals; ions; iron; oxidation; oxygen
Abstract:
... [Fe(2,2'-bpy)₃][Fe₂OCl₆] is obtained in form of red, air stable crystals by oxidation of Fe(bpy)Cl₂ with O₂ in acetonitrile. It crystallizes in the monoclinic space group P2₁/c with Z = 4. The crystal structure contains Fe(bpy)₃²⁺ and Fe₂OCl₆²⁻ ions. The anion exhibits a bent oxobridge with Fe-O-Fe = 148,1° and Fe-O distances of equal length (176,5 pm). In the IR spectrum νₐₛ Fe-O-Fe is observed a ...
DOI:
10.1515/znb-1984-1101

68. Synthesis of 7-norbornenols via Diels–Alder cycloadditions of cyclopentadienol generated by decomposition of ferrocenium cation

Author:
Stacey K. Allen; Thomas E. Lathrop; Sweta B. Patel; Deanna M. Harrell Moody; Roger D. Sommer; Thomas C. Coombs
Source:
Tetrahedron letters 2015 v.56 pp. 6038-6042
ISSN:
0040-4039
Subject:
acetonitrile; air; cations; chemical reactions; diastereomers; stereochemistry
Abstract:
... Ferrocenium hexafluorophosphate, Cp2FePF6, was determined to be a convenient source of cyclopentadienol when stirred open to air in a mixture of acetonitrile and water. The cyclopentadienol was intercepted via Diels–Alder reaction with a variety of dienophiles to afford cycloadducts having 7-norbornenol cores. Reactions were stereoselective, producing single diastereomers from endo approach of the ...
DOI:
10.1016/j.tetlet.2015.09.051

69. Tetrakis(Triphenylphosphine Oxide)Lithium Di(Iodo)Aurate(I)

Author:
Oliver Schuster; Hubert Schmidbaur
Source:
Zeitschrift für Naturforschung 2014 v.61 no.8 pp. 956-960
ISSN:
0932-0776
Subject:
acetonitrile; air; anions; cations; crystals; gold; iodides; ligands; lithium; oxidation
Abstract:
... The title compound, [(Ph₃PO)₄Li]⁺ AuI₂ ⁻, crystallized from a reaction mixture obtained from Ph₃PAuC≡CPh, LiMe and MeI (molar ratio 1 : 1 : 2) in diethylether upon subsequent oxidation in air. The triclinic crystals, space group P1̅, are isomorphous with those of the corresponding di(bromo)cuprate(I). The gold atoms of the two independent [AuI2]− anions reside on centers of inversion and have no c ...
DOI:
10.1515/znb-2006-0805

70. A simple QuEChERS-like extraction approach for molecular chemical characterization of organic aerosols: application to nitrated and oxygenated PAH derivatives (NPAH and OPAH) quantified by GC–NICIMS

Author:
A. Albinet; F. Nalin; S. Tomaz; J. Beaumont; F. Lestremau
Source:
Analytical and bioanalytical chemistry 2014 v.406 no.13 pp. 3131-3148
ISSN:
1618-2642
Subject:
Lampris guttatus; acetonitrile; aerosols; agitation; air; mixing; particulates; photooxidation; solid phase extraction; solvents; temperature
Abstract:
... An extraction procedure based on the Quick Easy Cheap Effective Rugged and Safe (QuEChERS) approach has been developed and used for analysis of particle-bound nitrated and oxygenated PAH derivatives (NPAH and OPAH, respectively). Several analytical conditions, for example GC injection temperature and MS detection settings, were optimized. This analytical procedure enabled simultaneous GC–NICIMS qu ...
DOI:
10.1007/s00216-014-7760-5

71. Analisis kromatografi cair kinerja tinggi untuk penetapan kadar asam galat, kafein dan epigalokatekin galat pada beberapa produk teh celup

Author:
Yohanes Martono; Sudibyo Martono
Source:
Agritech 2013 v.32 no.04 pp. -
ISSN:
2527-3825
Subject:
acetonitrile; air; black tea; detection limit; epigallocatechin gallate; gallic acid; green tea; high performance liquid chromatography; methanol; pH; tea bags
Abstract:
... A rapid and accurate High Performance Liquid Chromatography (HPLC) method for determination of gallic acid, caffein, and epigallocatechin gallate (EGCG) with an isocratic mobile phase elution was developed. HPLC parameters consisted of a C18 reversed-phase column (Eurosphere C18, 250 × 4.6 mm i.d., 5μm), mobile phase composed of 0.1% ortho phosporic acid : water : acetonitrile : methanol (14 : 7 : ...
DOI:
10.22146/agritech.9578

72. Coupling ASE, sylilation and SPME–GC/MS for the analysis of current-used pesticides in atmosphere

Author:
Caroline Raeppel; Marie Fabritius; Marie Nief; Brice M.R. Appenzeller; Maurice Millet
Source:
Talanta 2014 v.121 pp. 24-29
ISSN:
0039-9140
Subject:
acetonitrile; acids; air; derivatization; desorption; filters; gas chromatography-mass spectrometry; glass fibers; ions; pesticides; sodium chloride; solid phase microextraction; solvents; spring; summer; traps; uncertainty; urea; France
Abstract:
... An analytical methodology using Accelerated Solvent Extraction (ASE) and a sylilation procedure coupled to Solid Phase Micro-Extraction (SPME) and GC/MS was developed for the determination of 31 pesticides of different chemical classes (urea, phenoxy acids, pyrethrenoïds, etc.) commonly used in non-agricultural areas in atmospheric samples. This methodology was developed to evaluate the outdoor at ...
DOI:
10.1016/j.talanta.2013.12.040

73. Degradation of VX Surrogate Profenofos on Surfaces via in Situ Photo-oxidation

Author:
Petrick Lauren M.; Sabach Sara; Dubowski Yael
Source:
Environmental Science & Technology 2013 v.47 no.15 pp. 8751-8758
ISSN:
1520-5851
Subject:
acetonitrile; air; hydrophilicity; instrumentation; nerve tissue; oxygen; ozone; phosphoric acid; photooxidation; profenofos; relative humidity; superoxide anion; ultraviolet radiation
Abstract:
... Surface degradation of profenofos (PF), a VX nerve gas surrogate, was investigated using in situ photo-oxidation that combines simple instrumentation and ambient gases (O₂ and H₂O) as a function of exposure conditions ([O₃], [OH], UV light λ = 185 and/or 254 nm, relative humidity) and PF film surface density (0.38–3.8 g m–²). PF film 0.38 g m–² fully degraded after 60 min of exposure to both 254 a ...
DOI:
10.1021/es4016537

74. Determination of methylamine, dimethylamine, and trimethylamine in air by high-performance liquid chromatography with derivatization using 9-fluorenylmethylchloroformate

Author:
Mohammad Asif Iqbal; Jan E. Szulejko; Ki-Hyun Kim
Source:
Analytical methods 2014 v.6 no.15 pp. 5697-5707
ISSN:
1759-9679
Subject:
Raja clavata; acetonitrile; air; biodegradation; derivatization; detection limit; dimethylamine; fish; headspace analysis; high performance liquid chromatography; liquids; methylamine; methylation; spoilage; total volatile basic nitrogen; trimethylamine
Abstract:
... An HPLC-UV method coupled with 9-fluorenylmethylchloroformate (FMOC) derivatization was developed for the determination of short chained amines in an environmental matrix. The basic reaction conditions among different target compounds (three methylated amines: mono- (MA), di- (DMA), and tri-methylamine (TMA)) with the reagent (FMOC) have been investigated. Comparative calibration of TMA as an indi ...
DOI:
10.1039/c4ay00740a

75. Dispersed-Nanoparticle Loading Synthesis for Monodisperse Au-Titania Composite Particles and Their Crystallization for Highly Active UV and Visible Photocatalysts

Author:
Sakamoto Takeshi; Nagao Daisuke; Noba Masahiro; Ishii Haruyuki; Konno Mikio
Source:
Langmuir 2014 v.30 no.24 pp. 7244-7250
ISSN:
1520-5827
Subject:
acetonitrile; air; crystallization; ethanol; gold; hot water treatment; irradiation; nanogold; photocatalysis; photocatalysts; solvents; titanium dioxide; ultraviolet radiation
Abstract:
... Submicrometer-sized amorphous titania spheres incorporating Au nanoparticles (NPs) were prepared in a one-pot synthesis consisting of a sol–gel reaction of titanium(IV) isopropoxide in the presence of chloroauric acid and a successive reduction with sodium borohydride in a mixed solvent of ethanol/acetonitrile. The synthesis was allowed to prepare monodisperse titania spheres that homogeneously in ...
DOI:
10.1021/la5012499

76. Metal-Free Azaphosphaannulation of Phosphonamides through Intramolecular Oxidative C–N Bond Formation

Author:
Kim Yea Rin; Cho Seungyoon; Lee Phil Ho
Source:
Organic letters 2014 v.16 no.11 pp. 3098-3101
ISSN:
1523-7052
Subject:
acetonitrile; air; chemical bonding; chemical reactions; chemical structure; iodine; phosphorus
Abstract:
... We report an efficient metal-free azaphosphaannulation of a myriad of phosphonamides through intramolecular oxidative C–N bond formation using PhI(OAc)₂ and iodine in acetonitrile under air, thus leading to the formation of benzazaphosphol-3-one 1-oxides, which are novel phosphorus heterocyclic privileged structures. ...
DOI:
10.1021/ol501207w

77. Nitrogen-Doped Carbon Nanoparticles by Flame Synthesis as Anode Material for Rechargeable Lithium-Ion Batteries

Author:
Bhattacharjya Dhrubajyoti; Park Hyean-Yeol; Kim Min-Sik; Choi Hyuck-Soo; Inamdar Shaukatali N.; Yu Jong-Sung
Source:
Langmuir 2014 v.30 no.1 pp. 318-324
ISSN:
1520-5827
Subject:
acetone; acetonitrile; air; anodes; burning; carbon nanoparticles; dielectric spectroscopy; energy efficiency; graphene; ions; lithium batteries
Abstract:
... Nitrogen-doped turbostratic carbon nanoparticles (NPs) are prepared using fast single-step flame synthesis by directly burning acetonitrile in air atmosphere and investigated as an anode material for lithium-ion batteries. The as-prepared N-doped carbon NPs show excellent Li-ion stoarage properties with initial discharge capacity of 596 mA h g–¹, which is 17% more than that shown by the correspond ...
DOI:
10.1021/la403366e

78. Palladium(ii) complexes bearing the 1,2,3-triazole based organosulfur/ selenium ligand: synthesis, structure and applications in Heck and Suzuki–Miyaura coupling as a catalyst via palladium nanoparticles

Author:
Fariha Saleem; G. K. Rao; Arun Kumar; Satyendra Kumar; Mahabir P. Singh; Ajai K. Singh
Source:
RSC advances 2014 v.4 no.99 pp. 56102-56111
ISSN:
2046-2069
Subject:
Suzuki reaction; X-ray diffraction; acetonitrile; air; catalysts; catalytic activity; chemical bonding; energy; energy-dispersive X-ray analysis; geometry; ligands; nanoparticles; organobromine compounds; palladium; phenylboronic acids; selenium; sulfur; transmission electron microscopy; triazoles
Abstract:
... Air and moisture insensitive palladium complexes, [Pd(L)Cl₂] (1/2), in which L = 1-benzyl-4-phenylthiomethyl or 1-benzyl-4-phenylselenomethyl-1H-1,2,3-triazole (L1 or L2) catalyze Heck (HC) and Suzuki–Miyaura coupling (SMC) reactions between a series of aryl bromides including deactivated bromides and n-butyl acrylate and phenylboronic acid, respectively. The optimal catalytic loading was found to ...
DOI:
10.1039/c4ra09574j

79. Polymeric Double [Cu(NCS)] Chains in the Crystal Structure of [Cu2(Me2Ea)2(SCN)2]∞ (HMe2Ea = 2-Dimethylaminoethanol) (NewP olymorph) and the Dimeric Structure of its DMSO Adduct

Author:
Elena A. Vinogradova; Olga Yu. Vassilyeva; Volodymyr N. Kokozay; Brian W. Skelton
Source:
Zeitschrift für Naturforschung 2014 v.57 no.3 pp. 319-322
ISSN:
0932-0776
Subject:
X-radiation; acetonitrile; air; ammonium thiocyanate; cadmium; coordination polymers; copper; crystal structure; crystallization; crystals; dimethyl sulfoxide
Abstract:
... A new polymorph of the copper(II) thiocyanate complex with 2-dimethylaminoethanol, [Cu₂(Me₂Ea)₂(NCS)₂]∞ (HMe₂Ea = 2-dimethylaminoethanol, HL) 1, was isolated in the attempted synthesis of a mixed-metal complex from zerovalent copper, cadmium oxide and ammonium thiocyanate in CH₃CN solution of HL in air. [Cu₂(Me₂Ea)₂(NCS)₂(DMSO)₂] ₂ is a product of recrystallization of 1 from DMSO. X-ray analysis c ...
DOI:
10.1515/znb-2002-0310

80. Simultaneous Determination of Pyridine-Triphenylborane Anti-Fouling Agent and Its Degradation Products in Artificial Seawater by CZE

Author:
Netnapit Kaewchuay; Keiichi Fukushi; Takanari Hattori
Source:
Chromatographia 2013 v.76 no.15-16 pp. 1049-1053
ISSN:
0009-5893
Subject:
acetonitrile; air; chromatography; electrolytes; hydrolysis; pH; phenol; photolysis; seawater; sodium
Abstract:
... We developed a CZE method for simultaneous determination of pyridine-triphenylborane (PTPB) anti-fouling agent and its degradation products such as diphenylborinic acid (DPB), phenylboronic acid (MPB), and phenol in artificial seawater (ASW) with no extraction procedure. The ASW samples, in which 20 % (v/v) acetonitrile was added, were injected directly into the capillary using vacuum injection. A ...
DOI:
10.1007/s10337-013-2506-7

81. Sulfurization and Selenization of the Halfsandwich Nitrosylmetal Complexes Cp*M(CO)2NO (M = Cr, Mo) and Cp*M(NO)I2 (M = Mo, W)

Author:
Max Herberhold; Guo-Xin Jin; Arnold L. Rheingold
Source:
Zeitschrift für Naturforschung 2014 v.48 no.11 pp. 1488-1498
ISSN:
0932-0776
Subject:
X-radiation; acetonitrile; air; argon (noble gases); chromium; hydrogen sulfide; iodine; ligands; mass spectrometry; molybdenum; nitric oxide; nuclear magnetic resonance spectroscopy; selenium; sulfur; tungsten
Abstract:
... The photo-induced decarbonylation of Cp*Cr(CO)₂NO in acetonitrile solution in the presence of excess sulfur leads to the cyclo-pentasulfido complex Cp*Cr(NO)(S₅) (1 a), while in the case of limited sulfur supply the binuclear bis(µ-disulfido) complex Cp*₂Cr₂(NO)₂(µ-S₂)₂ (4a) is formed preferentially. The corresponding reaction with elemental selenium produces Cp*₂Cr₂(NO)₂(µ-Se₂)₂ (4b), irrespectiv ...
DOI:
10.1515/znb-1993-1106

82. [Cu(CN)en2]I – Copper Amine Propellers

Author:
Michael F. Bräu; Arno Pfitzner
Source:
Zeitschrift für Naturforschung B 2014 v.61 no.7 pp. 775-778
ISSN:
1865-7117
Subject:
acetonitrile; air; anions; cations; copper; crystal structure; direct contact; iodides; iodine; potassium cyanide; propellers
Abstract:
... Light blue [Cu(CN)en₂]I was prepared by reaction of copper iodide with ethylenediamine (en) and potassium cyanide in acetonitrile in air. It crystallizes in the space group C2 (No. 5) with a = 11.082(6), b = 7.155(2), c = 9.017(3) Å , β = 127.00(3)°, and Z = 2. The structure was refined from 1069 unique reflections and 90 parameters. The refinement converged to R1=0.018 and wR2=0.041 (all reflecti ...
DOI:
10.1515/znb-2006-0701

83. A sensitive LC-MS/MS method for measurement of organophosphorus pesticides and their oxygen analogs in air sampling matrices

Author:
Jenna L. Armstrong; Russell L. Dills; Jianbo Yu; Michael G. Yost; Richard A. Fenske
Source:
Journal of environmental science and health 2014 v.49 no.2 pp. 102-108
ISSN:
1532-4109
Subject:
acetonitrile; air; chlorpyrifos; correlation; detection limit; environmental health; foams; gas chromatography-mass spectrometry; liquid chromatography; monitoring; oxygen; polyurethanes; spray drift; stable isotopes; storage quality; tandem mass spectrometry
Abstract:
... A rapid liquid chromatography tandem mass spectrometry (LC-MS/MS) method has been developed for determination of levels of the organophosphorus (OP) pesticides chlorpyrifos (CPF), azinphos methyl (AZM), and their oxygen analogs chlorpyrifos-oxon (CPF-O) and azinphos methyl-oxon (AZM-O) on common active air sampling matrices. XAD-2 resin and polyurethane foam (PUF) matrices were extracted with acet ...
DOI:
10.1080/03601234.2014.846744
PubMed:
24328542
PubMed Central:
PMC5953420

84. Efficient and Highly Aldehyde Selective Wacker Oxidation

Author:
Teo Peili; Wickens Zachary K.; Dong Guangbin; Grubbs Robert H.
Source:
Organic letters 2012 v.14 no.13 pp. 3237-3239
ISSN:
1523-7052
Subject:
acetonitrile; air; aldehydes; alkenes; benzoquinones; chemical structure; oxidation
Abstract:
... A method for efficient and aldehyde-selective Wacker oxidation of aryl-substituted olefins using PdCl₂(MeCN)₂, 1,4-benzoquinone, and t-BuOH in air is described. Up to a 96% yield of aldehyde can be obtained, and up to 99% selectivity can be achieved with styrene-related substrates. ...
DOI:
10.1021/ol301240g

85. A modular approach toward the synthesis of 2,4-disubstituted pyridines

Author:
Raju Singha; Shubhendu Dhara; Jayanta K. Ray
Source:
Tetrahedron letters 2013 v.54 no.36 pp. 4841-4843
ISSN:
0040-4039
Subject:
acetonitrile; air; aldehydes; ammonium chloride; chemical reactions; chemical structure; pyridines; solvents; synthesis; triethylamine
Abstract:
... A number of 2,4-disubstituted pyridines have been synthesized using α,β,γ,δ-unsaturated aldehydes and ammonium chloride in the presence of triethylamine in acetonitrile solvent at 80°C under air balloon. ...
DOI:
10.1016/j.tetlet.2013.06.092

86. Analysis of phthalic, isophthalic and long-chain (C₄–C₁₂) dicarboxylic acids in atmospheric aerosols by UPLC/ESI/ToF-MS

Author:
Giovanni Mirivel; Véronique Riffault; Jean-Claude Galloo
Source:
Analytical methods 2011 v.3 no.5 pp. 1172-1179
ISSN:
1759-9679
Subject:
acetonitrile; aerosols; air; dicarboxylic acids; experimental design; filters; formic acid; ionization; liquids; mass spectrometry; methanol; solvents; ultra-performance liquid chromatography
Abstract:
... A new analytical method for the simultaneous determination of phthalic, isophthalic and 14 long-chain dicarboxylic acids in ambient aerosols by ultra-performance liquid chromatography/time-of-flight mass spectrometry with negative-ion electrospray ionization was developed and validated. A fast and quantitative pressurized fluid extraction procedure with water as solvent was optimized using samplin ...
DOI:
10.1039/c0ay00677g

87. Biomass burning in Siberia as a source of BrO to the Arctic free troposphere

Author:
M. Pommier; C.A. McLinden; J.A. Neuman; J.B. Nowak
Source:
Atmospheric environment 2012 v.62 no. pp. 416-423
ISSN:
1352-2310
Subject:
acetonitrile; aerosols; air; aircraft; atmospheric chemistry; biomass; bromine; burning; carbon monoxide; climate; forest fires; ozone; stratosphere; troposphere; water; water vapor; Alaska; Arctic region; Siberia
Abstract:
... During the ARCPAC (Aerosol, Radiation, and Cloud Processes affecting Arctic Climate) campaign in April 2008, several flights of the WP-3D research aircraft over the Arctic Ocean and Alaska sampled relatively rich bromine monoxide (BrO > 5 pptv) air masses in the free troposphere. In most cases air masses were identified as either stratospheric intrusions or as being recently in contact with sea-ic ...
DOI:
10.1016/j.atmosenv.2012.08.070

88. Corona Discharge Ion Mobility Spectrometry with Orthogonal Acceleration Time of Flight Mass Spectrometry for Monitoring of Volatile Organic Compounds

Author:
Sabo Martin; Matejčík Štefan
Source:
Analytical chemistry 2012 v.84 no.12 pp. 5327-5334
ISSN:
1520-6882
Subject:
1-propanol; acetone; acetonitrile; air; atmospheric pressure; benzene; butanol; ethanol; formaldehyde; ionization; mass spectrometry; methanol; models; monitoring; nitrogen; tetrahydrofuran; toluene; triethylamine; volatile organic compounds; xylene
Abstract:
... We demonstrate the application of corona discharge ion mobility spectrometry with orthogonal acceleration time of flight mass spectrometry (CD IMS-oaTOF) for volatile organic compounds (VOCs) monitoring. Two-dimensional (2D) IMS-oaTOF spectra of VOCs were recorded in nearly real time. The corona discharge atmospheric pressure chemical ionization (APCI) source was operated in positive mode in nitro ...
DOI:
10.1021/ac300722s

89. Oxidative desulfurization of diesel with TBHP/isobutyl aldehyde/air oxidation system

Author:
Wei Guo; Chengyong Wang; Peng Lin; Xiaoping Lu
Source:
Applied energy 2011 v.88 no.1 pp. 175-179
ISSN:
0306-2619
Subject:
acetonitrile; air; aldehydes; diesel fuel; hydrogenation; oxidants; oxidation; peroxidation; sulfur; synergism; temperature
Abstract:
... Oxidative desulfurization of hydrogenation diesel (40mL) was studied using air as oxidant, tert-butyl hydroperoxide (TBHP) as radical initiator at ambient pressure and moderate temperature in the presence of isobutyl aldehyde. TBHP could accelerate the production of carbonyl radical and its peroxidation. When the molar fraction of TBHP was 5mmol, the conversion of DBT could reach 96.1% in the pres ...
DOI:
10.1016/j.apenergy.2010.08.003

90. Oxygen-Initiated Chain Mechanism for Hydride Transfer Between NADH and NAD+ Models. Reaction of 1-Benzyl-3-Cyanoquinolinium Ion with N-Methyl-9,10-Dihydroacridine in Acetonitrile

Author:
Hao Weifang; Parker Vernon D.
Source:
Journal of organic chemistry 2012 v.77 no.20 pp. 9286-9297
ISSN:
1520-6904
Subject:
NAD (coenzyme); acetonitrile; aerobic conditions; air; hydrides; isotopes; organic chemistry; oxygen
Abstract:
... A reinvestigation of the formal hydride transfer reaction of 1-benzyl-3-cyanoquinolinium ion (BQCN⁺) with N-methyl-9,10-dihydroacridine (MAH) in acetonitrile (AN) confirmed that the reaction takes place in more than one step and revealed a new mechanism that had not previously been considered. These facts are unequivocally established on the basis of conventional pseudo-first-order kinetics. It wa ...
DOI:
10.1021/jo301874q

91. Radical-Involved Photosynthesis of AuCN Oligomers from Au Nanoparticles and Acetonitrile

Author:
Li Renhong; Kobayashi Hisayoshi; Tong Jiawei; Yan Xiaoqing; Tang Yu; Zou Shihui; Jin Jiabin; Yi Wuzhong; Fan Jie
Source:
Journal of the American Chemical Society 2012 v.134 no.44 pp. 18286-18294
ISSN:
1520-5126
Subject:
acetonitrile; air; catalytic activity; chemical bonding; cyanides; dissociation; gas chromatography-mass spectrometry; gold; hydroxybenzaldehyde; irradiation; nanogold; nuclear magnetic resonance spectroscopy; photosynthesis; porous media; silica; transmission electron microscopy; trapping; ultraviolet radiation
Abstract:
... We show here the first radical route for the direct photosynthesis of AuCN oligomers with different sizes and shapes, as evidenced by TEM observations, from an Au nanoparticle/benzaldehyde/CH₃CN ternary system in air under UV-light irradiation. This photochemical route is green, mild, and universal, which makes itself distinguishable from the common cyanidation process. Several elementary reaction ...
DOI:
10.1021/ja305198p

92. Reaction of a copper(ii)–nitrosyl complex with hydrogen peroxide: putative formation of a copper(i)–peroxynitrite intermediate

Author:
Apurba Kalita; Pankaj Kumar; Biplab Mondal
Source:
Chemical communications 2012 v.48 no.38 pp. 4636-4638
ISSN:
1364-548X
Subject:
acetonitrile; air; chemical communication; copper; hydrogen peroxide; nitric oxide; oxidation; phenol; spectral analysis; ultraviolet-visible spectroscopy
Abstract:
... The reaction of a Cu(ii)–nitrosyl complex (1) with hydrogen peroxide at −20 °C in acetonitrile results in the formation of the corresponding Cu(i)–peroxynitrite intermediate. The reduction of the Cu(ii) center was monitored by UV-visible spectroscopic studies. Formation of the peroxynitrite intermediate has been confirmed by its characteristic phenol ring nitration reaction as well as isolation of ...
DOI:
10.1039/c2cc31117h

93. Surface Tension Measurement at the Microscale by Passive Resonance of Capillary Waves

Author:
Pigot Christian; Hibara Akihide
Source:
Analytical chemistry 2012 v.84 no.5 pp. 2557-2561
ISSN:
1520-6882
Subject:
acetonitrile; air; light scattering; methanol; methodology; surface tension
Abstract:
... The properties of fluid interfaces increase in importance as the physical scale decreases and, hence, characterization of surface tension becomes all the more critical. However, there is to date no method to characterize this parameter on microscale surfaces. We propose here a simple method based on the resonance of capillary waves, which are naturally excited by thermal fluctuations, under one-di ...
DOI:
10.1021/ac3000804

94. Nano Pd(0) supported on cellulose: A highly efficient and recyclable heterogeneous catalyst for the Suzuki coupling and aerobic oxidation of benzyl alcohols under liquid phase catalysis

Author:
Navjot Jamwal; Ravinderpal Kour Sodhi; Princy Gupta; Satya Paul
Source:
International journal of biological macromolecules 2011 v.49 no.5 pp. 930-935
ISSN:
0141-8130
Subject:
X-ray diffraction; acetonitrile; air; benzaldehyde; bromides; catalysts; catalytic activity; cellulose; ethanol; hydrazine; mixing; oxidation; oxygen; palladium; scanning electron microscopes; scanning electron microscopy; thermal analysis; transmission electron microscopes; transmission electron microscopy
Abstract:
... Nano palladium(0) supported on cellulose was found to be highly efficient recyclable heterogeneous catalyst for the Suzuki coupling between aryl bromides and phenyl boronic acid in water and aerobic oxidation of benzyl alcohols using air as the source of molecular oxygen in acetonitrile. The Cell-Pd(0) was prepared by stirring commercially available cellulose with Pd(OAc)₂ in ethanol at 25°C follo ...
DOI:
10.1016/j.ijbiomac.2011.08.013

95. Organosulfates and oxidation products from biogenic hydrocarbons in fine aerosols from a forest in North West Europe during spring

Author:
Kasper Kristensen; Marianne Glasius
Source:
Atmospheric environment 2011 v.45 no.27 pp. 4546-4556
ISSN:
1352-2310
Subject:
high performance liquid chromatography; volatile organic compounds; adipic acid; sulfonic acids; mass spectrometry; forests; detection limit; atmospheric chemistry; aerosols; camphor; air; oxidation; conifers; isoprene; acetonitrile; filters; methanol; quartz; spring; solvents; air pollution; Denmark
Abstract:
... Organosulfates of monoterpenes and isoprene, as well as their oxidation products have been identified in biogenic secondary organic aerosols (BSOA) from both laboratory and field studies. Organosulfates provide an interesting coupling between air pollution and formation of low-volatility BSOA. HPLC quadrupole time-of-flight mass spectrometry was used to study polar acidic monoterpene and isoprene ...
DOI:
10.1016/j.atmosenv.2011.05.063

96. Surface grafting on poly(ethylene terephthalate) track-etched microporous membrane by activation with trifluorotriazine: Application to the biofunctionalization with GRGDS peptide

Author:
Rerat, Vincent; Pourcelle, Vincent; Devouge, Sabrina; Nysten, Bernard; Marchand-Brynaert, Jacqueline
Source:
Journal of polymer science 2010 v.48 no.1 pp. 195-208
ISSN:
0887-624X
Subject:
X-ray photoelectron spectroscopy; acetonitrile; air; atomic force microscopy; autoclaves; biocompatible materials; cell culture; contact angle; derivatization; gamma radiation; heat; hydrophilicity; ionization; polyethylene terephthalates; steam
Abstract:
... A two-step wet chemistry protocol has been developed for the surface derivatization of poly(ethylene terephthalate) (PET) track-etched membrane used as cell culturing support, that is, (a) activation by trifluorotriazine (1 M in acetonitrile (ACN), 30 °C, 3 h); (b) coupling to amine-terminated molecules, namely 3,5-bis(trifluoromethyl)benzylamine ((F)Tag), (L)-4,5-[³H]-lysine, and Gly-Arg-Gly-Asp- ...
DOI:
10.1002/pola.23778

97. Synthesis and catalytic application of monometallic molybdenum(IV) nitrile complexes

Author:
Bernd E. Diebl; Hui Yee Yeong; Mirza Cokoja; Eberhardt Herdtweck; Brigitte Voit; Fritz E. Kühn
Source:
Tetrahedron letters 2011 v.52 no.9 pp. 955-959
ISSN:
0040-4039
Subject:
acetonitrile; air; chemical structure; molecular weight; molybdenum; oils; oxidation; synthesis; temperature
Abstract:
... The novel molybdenum(IV) compound [MoO(NCMe)₅][B(C₆F₅)₄]₂ (1a) has been prepared by air oxidation of [Mo(CO)₃(NCMe)₃] in the presence of [H(OEt₂)₂][B(C₆F₅)₄] at room temperature. The [MoO(NCMe)₅]²⁺ cation shows a distorted octahedral configuration with two different acetonitrile-metal bond lengths due to a trans effect of the oxo-ligand. The trans-acetonitrile ligand is easily abstracted under oil ...
DOI:
10.1016/j.tetlet.2010.12.059

98. Development and validation of an automated monitoring system for oxygenated volatile organic compounds and nitrile compounds in ambient air

Author:
Roukos, J.; Plaisance, H.; Leonardis, T.; Bates, M.; Locoge, N.
Source:
Journal of chromatography 2009 v.1216 no.49 pp. 8642-8651
ISSN:
0021-9673
Subject:
acetaldehyde; acetone; acetonitrile; air; detection limit; emissions; esters; ethanol; ethers; flame ionization; helium; hydrophobicity; monitoring; polar compounds; relative humidity; temperature; vehicles (equipment); volatile organic compounds
Abstract:
... Few studies were conducted on oxygenated volatile organic compounds (OVOC) because of problems encountered during the sampling/analyzing steps induced by water in sampled air. Consequently, there is a lack of knowledge of their spatial and temporal trends and their origins in ambient air. In this study, an analyzer consisted of a thermal desorber (TD) interfaced with a gas chromatograph (GC) and a ...
DOI:
10.1016/j.chroma.2009.10.018

99. Electrocatalytic CO₂ Conversion to Oxalate by a Copper Complex

Author:
Angamuthu, Raja; Byers, Philip; Lutz, Martin; Spek, Anthony L.; Bouwman, Elisabeth
Source:
Science 2010 v.327 no.5963 pp. 313-315
ISSN:
0036-8075
Subject:
acetonitrile; air; carbon dioxide; catalytic activity; copper; electrochemistry; electrodes; feedstocks; global warming; hydrogen; lithium; oxalates; oxygen; superoxide anion; value added
Abstract:
... Global warming concern has dramatically increased interest in using CO₂ as a feedstock for preparation of value-added compounds, thereby helping to reduce its atmospheric concentration. Here, we describe a dinuclear copper(I) complex that is oxidized in air by CO₂ rather than O₂; the product is a tetranuclear copper(II) complex containing two bridging CO₂-derived oxalate groups. Treatment of the c ...
DOI:
10.1126/science.1177981

100. Optimization of the thermal environment of columns packed with very fine particles

Author:
Gritti, Fabrice; Guiochon, Georges
Source:
Journal of chromatography 2009 v.1216 no.9 pp. 1353-1362
ISSN:
0021-9673
Subject:
acetonitrile; air; chromatography; friction; heat; streams; temperature
Abstract:
... The apparent reduced HETP (height equivalent to a theoretical plate) of columns packed with very fine 1.7 μm BEH-C₁₈particles were measured under isocratic conditions, for different thermal conditions applied to the surface wall (column left in still-air at laboratory temperature, column placed in the oven of the Acquity UPLC chromatograph heated at different temperatures, or column immersed in a ...
DOI:
10.1016/j.chroma.2008.12.072