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1.   Calcium regulates K+/Na+ homeostasis in rice (Oryza sativa L.) under saline conditions

Author:
G.Q. Wu; S.M. Wang
Source:
Plant, Soil and Environment v.58 no.3 pp. 121-127
ISSN:
1214-1178
Subject:
Oryza sativa; absorption; calcium; cations; environment; homeostasis; rice; salinity; salt stress; soil
Abstract:
... To investigate the effects of Ca2+ on cation accumulation and K+/Na+ selectivity, in this study, two-week-old rice (Oryza sativa L.) plants were exposed to 25 or 125 mmol/L NaCl with or without 10 mmol/L CaCl2. At low salinity (25 mmol/L NaCl), Ca2+ significantly decreased Na+ accumulation in roots, increased K+ accumulat ...
DOI:
10.17221/374/2011-pse

2. (1,2-DAPH2)2Ge9(OH)4O18 · 2H2O: A New Microporous Germanate Based on the Interconnection of Ge9O18 Clusters Showing Reversible Water Emission and Uptake

Author:
Dragan Pitzschke; Christian Näther; Wolfgang Bensch
Source:
Zeitschrift für Naturforschung 2014 v.58 no.2-3 pp. 205-210
ISSN:
0932-0776
Subject:
X-ray diffraction; aqueous solutions; cations; crystals; geometry; germanium; porous media; shrinkage; skeleton
Abstract:
... Treatment of germanium dioxide with a 33% aqueous solution of 1,2-diaminopropane (DAP) under solvothermal conditions leads to the formation of colourless octahedral crystals of the novel germanate (1,2-DAPH₂)₂Ge₉(OH)₄O₁₈ · 2 H₂O. The compound crystallises in the orthorhombic space group Pbca, a = 14.4155(10), b = 12.9384(9), c = 14.5417(8) Å,V =2712.2 (3) ų; Z =4. The structure consists of an ani ...
DOI:
10.1515/znb-2003-2-301

3. (3 + 3) Cycloaddition of Oxyallyl Cations with Nitrones: Diastereoselective Access to 1,2-Oxazinanes

Author:
Marie Cordier; Alexis Archambeau
Source:
Organic letters 2018 v.20 no.8 pp. 2265-2268
ISSN:
1523-7052
Subject:
Lewis acids; cations; chemical structure; chemoselectivity; cycloaddition reactions; diastereoselectivity; ketones
Abstract:
... Oxyallyl cations are prepared in situ from readily available α-tosyloxy ketones and act as transient electrophilic partners in (3 + 3) cycloaddition with nitrones. Under mild conditions, this method provides a chemoselective and diastereoselective route to polysubstituted 1,2-oxazinanes. A stepwise process is proposed to rationalize the diastereoselectivity of this transformation. ...
DOI:
10.1021/acs.orglett.8b00617

4. The (4+3)-cycloaddition reaction: heteroatom-substituted allylic cations as dienophiles

Author:
Michael Harmata
Source:
Chemical communications 2010 v.46 no.47 pp. 8904-8922
ISSN:
1364-548X
Subject:
catalytic activity; cations; chemical compounds; chemical reactions; diastereoselectivity; enantioselectivity
Abstract:
... The (4+3)-cycloaddition of allylic cations to dienes is a powerful method for the direct synthesis of seven-membered rings. Recent developments in this area have included new methods for the generation of allylic cations, diastereoselective and catalytic, enantioselective reactions, an increased understanding of the diverse mechanistic possibilities of the reaction and applications to the total sy ...
DOI:
10.1039/c0cc03621h

5. The (4+3)-cycloaddition reaction: simple allylic cations as dienophiles

Author:
Michael Harmata
Source:
Chemical communications 2010 v.46 no.47 pp. 8886-8903
ISSN:
1364-548X
Subject:
catalytic activity; cations; chemical compounds; chemical reactions; diastereoselectivity; enantioselectivity
Abstract:
... The (4+3)-cycloaddition of allylic cations to dienes is a powerful method for the direct synthesis of seven-membered rings. Recent developments in this area have included new methods for the generation of allylic cations, diastereoselective and catalytic, enantioselective reactions, an increased understanding of the diverse mechanistic possibilities of the reaction and applications to the total sy ...
DOI:
10.1039/c0cc03620j

6. The (CF₃C(O)NH)(C₆H₅CH₂NH)₂P(O) phosphoric triamide as a novel carrier with excellent efficiency for Cu(ii) in a liquid membrane transport system

Author:
Setareh Akbari; Razieh Sanavi Khoshnood; Fatemeh Karimi Ahmadabad; Mehrdad Pourayoubi; Michal Dušek; Ekaterina S. Shchegravina
Source:
RSC advances 2019 v.9 no.16 pp. 9153-9159
ISSN:
2046-2069
Subject:
aqueous solutions; atomic absorption spectrometry; cadmium; carbon; cations; cobalt; copper; fluorine; hydrogen; lead; ligands; liquid membranes; mass spectrometry; nickel; nuclear magnetic resonance spectroscopy; phosphorus; physiological transport; silver; stable isotopes; stoichiometry; zinc
Abstract:
... Transport of Ag(i), Cd(ii), Co(ii), Cu(ii), Ni(ii), Pb(ii) and Zn(ii) cations across a bulk liquid membrane (BLM) containing N,N′-dibenzyl-N′′-(2,2,2-trifluoroacetyl)-phosphoric triamide (PTC) as a new carrier is studied by atomic absorption spectrometry. The results show selective and efficient transport of the copper(ii) cation from aqueous solution in the presence of the other cations. Various ...
DOI:
10.1039/c8ra09118h

7. (C₃H₉NI)₄AgBiI₈: a direct-bandgap layered double perovskite based on a short-chain spacer cation for light absorption

Author:
Yunpeng Yao; Bo Kou; Yu Peng; Zhenyue Wu; Lina Li; Sasa Wang; Xinyuan Zhang; Xitao Liu; Junhua Luo
Source:
Chemical communications 2020 v.56 no.21 pp. 3206-3209
ISSN:
1364-548X
Subject:
cations; chemical reactions; iodides; lead; semiconductors
Abstract:
... A new iodide layered double perovskite (C₃H₉NI)₄AgBiI₈ (IPAB) has been developed based on a short-chain spacer cation, which is the first homologous compound in iodide double perovskites that adopt the Ruddlesden–Popper structure type. Importantly, IPAB is a promising environmentally friendly alternative to the recently rapidly progressing lead halide semiconductors owing to its narrow direct-band ...
DOI:
10.1039/c9cc07796k

8. (H₂NC₄H₈NCH₂CH₂NH₂)₂Zn₂Sn₂Se₇: a hybrid ternary semiconductor stabilized by amine molecules acting simultaneously as ligands and counterions

Author:
Aggelos Philippidis; Thomas Bakas; Pantelis N. Trikalitis
Source:
Chemical communications 2009 v. no.12 pp. 1556-1558
ISSN:
1364-548X
Subject:
cations; chemical communication; chemical reactions; ligands; organic matter; selenides; semiconductors
Abstract:
... A hybrid, organic–inorganic ternary semiconductor with chemical formula (H₂NC₄H₈NCH₂CH₂NH₂)₂Zn₂Sn₂Se₇ is reported in which the organic molecules have a dual role, acting simultaneously as ligands and charge balancing cations. ...
DOI:
10.1039/b821859e

9. (Oligo)thienyl-imidazo-benzocrown ether derivatives: Synthesis, photophysical studies and evaluation of their chemosensory properties

Author:
Rosa M.F. Batista; Elisabete Oliveira; Susana P.G. Costa; Carlos Lodeiro; M. Manuela M. Raposo
Source:
Talanta 2011 v.85 no.5 pp. 2470-2478
ISSN:
0039-9140
Subject:
absorption; cations; chelation; dimethyl sulfoxide; ethers; fluorescence; fluorescence emission spectroscopy; fluorometry; mercury; nickel; sodium
Abstract:
... A series of novel (oligo)thienyl-imidazo-benzocrown ethers were synthesised through a simple method and evaluated as fluorimetric chemosensors for transition metal cations. Interaction with Ni²⁺, Pd²⁺, and Hg²⁺ in ACN/DMSO solution (99:1) was studied by absorption and emission spectroscopy. Chemoselectivity studies in the presence of Na⁺ were also carried out and a fluorescence enhancement upon ch ...
DOI:
10.1016/j.talanta.2011.07.107

10. (Phenylethynyl)Trimethylphosphonium Bromide And Bromoaurates(I)

Author:
Oliver Schuster; Hubert Schmidbaur
Source:
Zeitschrift für Naturforschung 2014 v.61 no.8 pp. 961-967
ISSN:
0932-0776
Subject:
Lewis bases; anions; bromides; bromine; cations; crystal structure; crystals; gold; methylene chloride; nuclear magnetic resonance spectroscopy; slurries
Abstract:
... (Phenylethynyl)trimethylphosphonium bromide (1) has been reinvestigated by NMR spectroscopy and its crystal structure determined. In the monoclinic crystals, the cations are arranged in layers in the a-c planes, with their P-C≡C-Ph axes parallel within one layer, but alternating in consecutive layers. The bromide anions are accommodated in channels between the cations. The spectroscopic and struct ...
DOI:
10.1515/znb-2006-0806

11. (Sr1–xBax)FeO2 (0.4 ≤ x ≤ 1): A New Oxygen-Deficient Perovskite Structure

Author:
Yamamoto Takafumi; Kobayashi Yoji; Hayashi Naoaki; Tassel Cédric; Saito Takashi; Yamanaka Shoji; Takano Mikio; Ohoyama Kenji; Shimakawa Yuichi; Yoshimura Kazuyoshi; Kageyama Hiroshi
Source:
Journal of the American Chemical Society 2012 v.134 no.28 pp. 11444-11454
ISSN:
1520-5126
Subject:
barium; cations; hydrides; iron; iron oxides; occupations; oxidation; oxygen; spectroscopy
Abstract:
... Topochemical reduction of (layered) perovskite iron oxides with metal hydrides has so far yielded stoichiometric compositions with ordered oxygen defects with iron solely in FeO₄ square planar coordination. Using this method, we have successfully obtained a new oxygen-deficient perovskite, (Sr₁–ₓBaₓ)FeO₂ (0.4 ≤ x ≤ 1.0), revealing that square planar coordination can coexist with other 3–6-fold coo ...
DOI:
10.1021/ja3007403

12. (Sub)surface-Promoted Disproportionation and Absolute Band Alignment in High-Power LiMn2O4 Cathodes

Author:
Scivetti Ivan; Teobaldi Gilberto
Source:
The Journal of Physical Chemistry C 2015 v.119 no.37 pp. 21358-21368
ISSN:
1932-7455
Subject:
cathodes; cations; electrochemistry; geometry; lithium; lithium batteries; manganese; manganese oxides; methodology; physical chemistry; van der Waals forces
Abstract:
... We present an isotropic (Uₑff) and anisotropic (U–J) Hubbard and van der Waals (vdW)-corrected density functional theory study of bulk and low-index surfaces of lithium manganese oxide LiMn₂O₄ (LMO), a promising cathode material for high-power Li-ion batteries. Use of anisotropic (U–J) corrections in the simulation of bulk LMO leads to improved agreement with available experimental data, whereas v ...
DOI:
10.1021/acs.jpcc.5b06522

13. La₁ .₅Sr₀.₅NiMn₀.₅Ru₀.₅O₆ Double Perovskite with Enhanced ORR/OER Bifunctional Catalytic Activity

Author:
Maria Retuerto; Federico Calle-Vallejo; Laura Pascual; Gunnar Lumbeeck; María Teresa Fernandez-Diaz; Mark Croft; Jagannatha Gopalakrishnan; Miguel A. Peña; Joke Hadermann; Martha Greenblatt; Sergio Rojas
Source:
ACS applied materials & interfaces 2019 v.11 no.24 pp. 21454-21464
ISSN:
1944-8252
Subject:
X-ray absorption spectroscopy; X-ray diffraction; catalysts; catalytic activity; cations; density functional theory; electrochemistry; manganese; neutron diffraction; oxidation; oxygen; oxygen production; transmission electron microscopy
Abstract:
... Perovskites (ABO₃) with transition metals in active B sites are considered alternative catalysts for the water oxidation to oxygen through the oxygen evolution reaction (OER) and for the oxygen reduction through the oxygen reduction reaction (ORR) back to water. We have synthesized a double perovskite (A₂BB′O₆) with different cations in A, B, and B′ sites, namely, (La₁.₅Sr₀.₅)A(Ni₀.₅Mn₀.₅)B(Ni₀.₅R ...
DOI:
10.1021/acsami.9b02077

14. 1,1,1,1 -Tetrakis[triorganylphosphineaurio(I)]ethanium(+) Tetrafluoroborates - Hypercoordinated Species Containing [H3C—C(AuL)4]+ Cations

Author:
Oliver Steigeimann; Peter Bissinger; Hubert Schmidbaur
Source:
Zeitschrift für Naturforschung 2014 v.48 no.1 pp. 72-78
ISSN:
0932-0776
Subject:
X-radiation; carbon; cations; chlorides; ethane; gold; moieties; spectroscopy
Abstract:
... Hypercoordinate, tetraaurated carbon-complexes of the type [H₃C--C (AuPR₃)₄]⁺BF₄⁻, R = Ph (1), R = C₆H₁₁ (2), (PR₃)₂ = 1,2-C₆H₄(CH₂CH₂PPh₂)₂ (3) have been prepared by the reaction of the appropriate (phosphane)gold(I) chlorides with 1,1,1-tris(dimethoxyboryl)ethane H₃C -C [B(OMe)₂]₃ in the presence of CsF. The products have been characterized by standard analytical and spectroscopic methods, inclu ...
DOI:
10.1515/znb-1993-0116

15. 1,1-Diamino-2,2-dinitroethene (FOX-7) and 1-amino-1-hydrazino-2,2-dinitroethene (HFOX) as amphotères: bases with strong acids

Author:
Thao T. Vo; Jean'ne M. Shreeve
Source:
Journal of materials chemistry A 2015 v.3 no.16 pp. 8756-8763
ISSN:
2050-7496
Subject:
X-ray diffraction; acetone; acids; anions; cations; chemistry; chlorides; hydrazine; hydrazones; oxygen; perchlorates; trinitrotoluene
Abstract:
... The exciting discovery of the first cations based on 1,1-diamino-2,2-dinitroethene (FOX-7) and its hydrazine derivative, 1-amino-1-hydrazino-2,2-dinitroethene (HFOX), along with their syntheses and full characterization is described. The oxygen rich content of these cations lends to their potential as promising precursors for energetic salts. A variety of acids including triflic, perchloric, and h ...
DOI:
10.1039/c4ta07098d

16. 1,10-Phenanthrolines: versatile building blocks for luminescent molecules, materials and metal complexes

Author:
Gianluca Accorsi; Andrea Listorti; K. Yoosaf; Nicola Armaroli
Source:
Chemical Society reviews 2009 v.38 no.6 pp. 1690-1700
ISSN:
1460-4744
Subject:
cations; chromium; coordination compounds; copper; erbium; europium; fluorescence; neodymium; osmium; physicochemical properties; platinum; rhodium; ruthenium; silver; ytterbium; zinc
Abstract:
... 1,10-Phenanthroline entails several appealing structural and chemical properties: rigidity, planarity, aromaticity, basicity, chelating capability. This makes it a versatile starting material for synthetic organic, inorganic and supramolecular chemistry. In this tutorial review we examine how the chemical versatility of pristine 1,10-phenanthroline, a weakly fluorescent molecule, has been exploite ...
DOI:
10.1039/b806408n

17. 1,1′-Di(tert-butyl)metallocenium Cations. The X-Ray Crystal Structures of [M(C5H4tBu)2]PF6 (M = Fe, Co) and [Co (C5H4t Bu)2]2CoCl4

Author:
Max Herberhold; Yan-Xiang Cheng; Guo-Xin Jin; Wolfgang Milius
Source:
Zeitschrift für Naturforschung 2014 v.55 no.9 pp. 814-820
ISSN:
0932-0776
Subject:
cations; cobalt; crystal structure; iron; ligands; salts
Abstract:
... The hexafluorophosphate salts [Fe(C₅H₄ᵗBu)₂]PF₆ (1) and [Co(C₅ H₄ ᵗBu)₂]PF₆ (2) crystallize in isotypic structures with centrosymmetric cations which have a staggered (transoid) conformation of the exactly parallel ring ligands (conformational angle τ = 180°). The tetrachlorocobaltate salt, [Co(C₅H₄ᵗBu)₂ ]₂ CoCl₄ (3), contains one almost eclipsed (τ = 140.4°) and one almost staggered (τ = 101.4°) ...
DOI:
10.1515/znb-2000-0905

18. 1,2,3-Triazolium-Based Poly(2,6-Dimethyl Phenylene Oxide) Copolymers as Anion Exchange Membranes

Author:
Liu Lei; He Shuqing; Zhang Shufang; Zhang Min; Guiver Michael D.; Li Nanwen
Source:
ACS applied materials 2016 v.8 no.7 pp. 4651-4660
ISSN:
1944-8252
Subject:
ambient temperature; cations; composite polymers; fuel cells; ion exchange; sodium bicarbonate; sodium hydroxide
Abstract:
... Anion exchange membranes (AEMs) based on 1,2,3-triazolium (TAM) were prepared from commercial poly(2,6-dimethyl phenylene oxide) (PPO) via “click chemistry” and subsequent N-alkylation. Flexible and tough membranes with various ion exchange capacities (IECs) were obtained by casting the polymers from NMP solutions. Although the resulting TAM-functionalized PPOs (PPO-TAM) membranes exhibited incomp ...
DOI:
10.1021/acsami.5b11519

19. 1,3,4,5-Tetramethyl-2-methylenimidazolin - ein Olefin mit Ylid-artigen Eigenschaften [1] / 1,3,4,5-Tetramethyl-2-methylenimidazoline - an Olefin with Ylidic Properties [1]

Author:
Norbert Kuhna; Hans Bohnena; Gerald Henkel; Jörg Kreutzberg
Source:
Zeitschrift für Naturforschung 2014 v.51 no.9 pp. 1267-1278
ISSN:
0932-0776
Subject:
boranes; carbon disulfide; cations; iodine; methylene chloride; olefin; silanes; silylation
Abstract:
... A facile synthesis of l,3,4,5-tetramethyl-2-methylenimidazoline 5 (Im) starting from the pentamethylimidazolium ion (8) and KH is described. Boranes react with 5 to give the adducts ImBHi₃ (11) and ImBF₃ (18). With Mel and CH₃C(O)Cl the imidazolium salts ImMe⁺ (19) and ImC(O)Me⁺ (20) are obtained. CS₂ gives the zwitterionic compound ImCS₂ (24) which is transformed into the cationic thiocarboxylic ...
DOI:
10.1515/znb-1996-0909

20. 1,3,5-Tris(dimethylamino)benzol mit Iod und 1,3,5-Tricyanobenzol: Eine ungewöhnliche Dimerisierung und ein „normaler“ Donor/Akzeptor-Komplex / 1,3,5-Tris(dimethylamino)benzene with Iodine and 1,3,5-Tricyanobenzene: An Unusual Dimerization and a “Normal” Donor/Acceptor-Complex

Author:
H. J. Keller; R. Niebl; G. Renner; D. von der Ruhr; D. Schweitzer
Source:
Zeitschrift für Naturforschung 2014 v.43 no.3 pp. 265-270
ISSN:
0932-0776
Subject:
ambient temperature; anions; benzene; blood platelets; cations; dimerization; iodine; stoichiometry
Abstract:
... Reaction of 1,3,5-tris(dimethylamino)benzene (TDMAB) with iodine in solution gives dark red needles of a compound (1) with stoichiometry C₂₄H₄₂I₆N₆, Mr = 1176.07, orthorhombic, Cmca, Z = 4, a = 10.865(2) Å, b = 16.737(6) Å. c = 20.511(9) Å, V = 3730 ų, dc = 2.1 g·cm⁻³ measured at room temperature, R = 0.062 for 744 independent reflections and 100 L. S.-parameters. The solid contains bis[tris(dime ...
DOI:
10.1515/znb-1988-0305

21. 1,3-Butadiene Adsorption over Transition Metal Polycation Exchanged Faujasites

Author:
Tsybulevski Albert M.; Kustov Leonid M.; Weston Kerry C.; Greish Alexander A.; Tkachenko Olga P.; Kucherov Alexey V.
Source:
Industrial & Engineering Chemistry Research 2012 v.51 no.20 pp. 7073-7080
ISSN:
1520-5045
Subject:
X-ray absorption spectroscopy; acidity; adsorbents; adsorption; cations; copper; engineering; hydrolysis; ion exchange; liquids; manganese; oligomerization; temperature; zeolites; zinc
Abstract:
... New adsorbents for butadiene removal from liquid and gas streams, which are transition metal (Cu, Zn, Mn) polycation exchanged zeolites, were prepared on the basis of low-silica and dealuminated faujasites by ion exchange with the corresponding salt solutions at the conditions of their partial hydrolysis. Obtained samples were characterized by XANES, ESR, and DRIFT spectroscopy along with equilibr ...
DOI:
10.1021/ie202478c

22. 1,3-Cationic Alkylidene Migration of Nonclassical Carbocation: A Density Functional Theory Study on Gold(I)-Catalyzed Cycloisomerization of 1,5-Enynes Containing Cyclopropene Moiety

Author:
Zhou Qinghai; Li Yuxue
Source:
Journal of the American Chemical Society 2014 v.136 no.4 pp. 1505-1513
ISSN:
1520-5126
Subject:
cations; gold; methodology; reaction mechanisms; topology
Abstract:
... For quite a long time, nonclassical carbocations have only been regarded as special intermediates with limited cases in solvolysis reactions. However, the present work shows that in common reaction, typical nonclassical carbocations may be involved in and have significant effects on the reaction mechanisms. In this work, DFT studies have been performed on the mechanism of gold(I)-catalyzed cyclois ...
DOI:
10.1021/ja410734e

23. 1,3-Chlorine Shift to a Vinyl Cation: A Combined Experimental and Theoretical Investigation of the E-Selective Gold(I)-Catalyzed Dimerization of Chloroacetylenes

Author:
Mathis Kreuzahler; Alyssa Daniels; Christoph Wölper; Gebhard Haberhauer
Source:
Journal of the American Chemical Society 2018 v.141 no.3 pp. 1337-1348
ISSN:
1520-5126
Subject:
alkynes; catalytic activity; cations; dimerization; gold; nuclear magnetic resonance spectroscopy; quantum mechanics; stereoselectivity
Abstract:
... Metal-catalyzed dimerization reactions of terminal acetylenes are well known in the literature. However, only a few examples of the dimerization of halogen-substituted acetylenes are described. The products of the latter metal-catalyzed dimerization are the branched head-to-tail enynes. The formation of the corresponding linear head-to-head enynes has not been reported yet. Herein, we demonstrate ...
DOI:
10.1021/jacs.8b11501

24. 1,3-Dimethylbarbiturat-Salze organischer Kationen / 1,3-Dimethylbarbiturate Salts of Organic Cations

Author:
Norbert Kuhn; Cäcilia Maichle-Mößmer; Elke Niquet; Manfred Steimann; Kamal Sweidan
Source:
Zeitschrift für Naturforschung 2014 v.60 no.7 pp. 715-719
ISSN:
0932-0776
Subject:
barbiturates; cations; crystal structure; hydrogen; hydrogen bonding; salts
Abstract:
... The barbiturate salts 2-amino-1,3-dimethylimidazolium N,N’-dimethylbarbiturate (8) and 1,3- diisopropyl-4,5-dimethylimidazolium N,N’-dimethylbarbiturate (10) are obtained from N,N’- dimethylbarbituric acid (6) and 2-imino-1,3-dimethylimidazoline (7) or 2,3-dihydro-1,3-diisopropyl- 4,5-dimethylimidazol-2-ylidene (9) in good yields. Their crystal structures reveal the presence of strong interionic N ...
DOI:
10.1515/znb-2005-0703

25. 1,3-Dipolar [3 + 3] cycloaddition of α-halohydroxamate-based azaoxyallyl cations with hydrazonoyl chloride-derived nitrile imines

Author:
Hong-Wu Zhao; Yu-Di Zhao; Yue-Yang Liu; Li-Jiao Zhao; Xiu-Qing Song; Xiao-Qin Chen; Hai-Liang Pang; Juan Du; Ning-Ning Feng
Source:
RSC advances 2017 v.7 no.87 pp. 55106-55109
ISSN:
2046-2069
Subject:
X-radiation; cations; crystal structure; cycloaddition reactions; imines; triethylamine
Abstract:
... Promoted by Et₃N, the 1,3-dipolar [3 + 3] cycloaddition of α-halohydroxamate-based azaoxyallylcations with hydrazonoyl chloride-derived nitrile imines occurred efficiently, and furnished desired products in acceptable chemical yields. The chemical structure of the title compounds was firmly confirmed by an X-ray single crystal structure analysis. ...
DOI:
10.1039/c7ra09766b

26. 1,4-Bis(trimethylsilyl)-2,5-dimethoxybenzene: a novel redox shuttle additive for overcharge protection in lithium-ion batteries that doubles as a mechanistic chemical probe

Author:
Jinhua Huang; Ilya A. Shkrob; Peiqi Wang; Lei Cheng; Baofei Pan; Meinan He; Chen Liao; Zhengcheng Zhang; Larry A. Curtiss; Lu Zhang
Source:
Journal of materials chemistry A 2015 v.3 no.14 pp. 7332-7337
ISSN:
2050-7496
Subject:
cations; chemistry; electrodes; lithium batteries; organosilicon compounds
Abstract:
... A novel redox shuttle additive, 1,4-bis(trimethylsilyl)-2,5-dimethoxybenzene (BTMSDB), is shown to deliver superb overcharge protection of LiFePO₄ electrode in Li-ion batteries. Using this molecule as a chemical probe, we trace the cause of the eventual failure of this additive to the gradual loss of steric protection in the corresponding radical cation, providing the much needed mechanistic insig ...
DOI:
10.1039/c5ta00899a

27. 1,4-Diazacubane crystal structure rectified as piperazinium

Author:
Kasun S. Athukorala Arachchige; Tyler Fahrenhorst-Jones; Jed M. Burns; Hydar A. AL-Fayaad; Jogendra N. Behera; C. N. R. Rao; Jack K. Clegg; Craig M. Williams
Source:
Chemical communications 2019 v.55 no.78 pp. 11751-11753
ISSN:
1364-548X
Subject:
cations; chemical reactions; coordination polymers; crystal structure; enthalpy; nickel; quantum mechanics
Abstract:
... All 21 [n]-azacubanes are proposed by theoreticians to be stable, however, to-date only the synthesis of 1,4-diazacubane has been reported – as a Ni²⁺ templated Kagome metal organic framework (MOF). Described herein is the structural reassignment of this Kagome MOF on the basis of deducing the precise experimental procedure, and demonstrating that rather than the formation of 1,4-diazacubane, char ...
DOI:
10.1039/c9cc06272f

28. 1,4-Dihydro-1,4-diphosphinine fused with two tetrathiafulvalenes

Author:
Narcis Avarvari; Marc Fourmigué
Source:
Chemical communications 2004 v. no.24 pp. 2794-2795
ISSN:
1364-548X
Subject:
cations; chemical compounds; chemical reactions; cis-trans isomers; crystal structure; electrochemistry; moieties
Abstract:
... Electrochemical and theoretical investigations demonstrate through-bond interactions between two TTF moieties fused to a 1,4-dihydro-1,4-diphosphinine, for which the single crystal X-ray structure of the cis isomer is described together with that of a mixed-valent, charge-localized, radical cation salt with Mo₆O₁₉²⁻, obtained upon electrocrystallization of the same cis isomer. ...
DOI:
10.1039/b412193g

29. 1,6-Carbene Transfer: Gold-Catalyzed Oxidative Diyne Cyclizations

Author:
Nösel Pascal; dos Santos Comprido Laura Nunes; Lauterbach Tobias; Rudolph Matthias; Rominger Frank; Hashmi A. Stephen K.
Source:
Journal of the American Chemical Society 2013 v.135 no.41 pp. 15662-15666
ISSN:
1520-5126
Subject:
alkynes; catalysts; cations; diazo compounds; gold; oxidation; oxygen; standard operating procedures
Abstract:
... In the presence of a gold catalyst an unprecedented oxidative cyclization of diynes takes place. The reaction cascade is initiated by an oxygen transfer from a N-oxide onto a gold-activated alkyne. The formed α-oxo carbene is transferred across the second alkyne yielding a stabilized vinyl carbene/cation. Alkyl migration or sp³-CH insertion then terminates the catalytic cycle by formation of highl ...
DOI:
10.1021/ja4085385

30. A 1,6-Ring Closure Mechanism for (+)-δ-Cadinene Synthase?

Author:
Faraldos Juan A.; Miller David J.; González Verónica; Yoosuf-Aly Zulfa; Cascón Oscar; Li Amang; Allemann Rudolf K.
Source:
Journal of the American Chemical Society 2012 v.134 no.13 pp. 5900-5908
ISSN:
1520-5126
Subject:
Gossypium arboreum; cations; cotton; enzyme activity; enzymes; fluorine; germacrene; gossypol; mechanism of action; phytoalexins; stereochemistry
Abstract:
... Recombinant (+)-δ-cadinene synthase (DCS) from Gossypium arboreum catalyzes the metal-dependent cyclization of (E,E)-farnesyl diphosphate (FDP) to the cadinane sesquiterpene δ-cadinene, the parent hydrocarbon of cotton phytoalexins such as gossypol. In contrast to some other sesquiterpene cyclases, DCS carries out this transformation with >98% fidelity but, as a consequence, leaves no mechanistic ...
DOI:
10.1021/ja211820p

31. 1,8-Naphthyridinic fluorescent ‘turn-on’ and ‘turn-off’ chemosensors for detection of F⁻ and Hg²⁺ ions mimicking INHIBIT molecular logic behaviour

Author:
Mandeep K. Chahal; Muniappan Sankar
Source:
Analytical methods 2015 v.7 no.11 pp. 4552-4559
ISSN:
1759-9679
Subject:
anions; bromides; cadmium; cations; chlorides; cobalt; copper; deprotonation; detection limit; fluorescence; fluorescent dyes; fluorides; iodides; lead; manganese; mercury; methanol; moieties; nickel; nitrates; perchlorates; receptors; silver; sodium; solvents; spectroscopy; sulfates; zinc
Abstract:
... Two new receptors viz. 2-bromoacetamido-5,7-dimethyl-1,8-naphthyridine (1a) and 2-chloroacetamido-5,7-dimethyl-1,8-naphthyridine (1b) containing 1,8-naphthyridine as fluorophore unit have been designed and synthesised. These receptors exhibited very high selectivity for F⁻ ions among the various anions tested such as H₂PO₄⁻, OAc⁻, Cl⁻, Br⁻, I⁻, HSO₄⁻, PF₆⁻, ClO₄⁻, BF₄⁻ and NO₃⁻ owing to anion-indu ...
DOI:
10.1039/c5ay00752f

32. A 1,8-naphthalimide group modified magnetic silica nanoparticles INHIBIT logic gate with H⁺ and F⁻ as inputs

Author:
Xin Tian; Zhengping Dong; Yifan Huang; Jiantai Ma
Source:
Colloids and surfaces 2011 v.387 no.1-3 pp. 29-34
ISSN:
0927-7757
Subject:
Fourier transform infrared spectroscopy; X-radiation; X-ray diffraction; cations; colloids; fluorescence; fluorides; nanoparticles; protons; silica; transmission electron microscopy
Abstract:
... In this work, molecular logic element modified multifunctional silica nanoparticles having high magnetization have been successfully prepared. These multifunctional nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), Elementary analysis, X-ray powder diffraction (XRD) and Vibrating sample magnetometer (VSM). The characterizat ...
DOI:
10.1016/j.colsurfa.2011.07.021

33. A 1,8-naphthalimide-based chemosensor for dual-mode sensing: colorimetric and fluorometric detection of multiple analytes

Author:
Yeo-Kyung La; Jong-Ah Hong; Yujin Jeong; Jiyoun Lee
Source:
RSC advances 2016 v.6 no.87 pp. 84098-84105
ISSN:
2046-2069
Subject:
anions; cations; chemical species; color; colorimetry; cyanides; detection limit; fluorescence; fluorometry; hydrazones; quinoline
Abstract:
... We designed a 1,8-naphthalimide-based chemosensor for dual-mode sensing of multiple analytes. Sensor 1 contains a hydrazone linker with a quinoline group that can generate CN⁻ and F⁻-specific color changes while exhibiting Hg²⁺-specific fluorescence enhancement. Sensor 1 demonstrated highly specific and sensitive signal changes upon binding to these ions with detection limits in the submicromolar ...
DOI:
10.1039/c6ra20100h

34. 1-Ethyl-2,3-dimethylimidazolium paramagnetic ionic liquids with 3D magnetic ordering in its solid state: synthesis, structure and magneto-structural correlations

Author:
Abel García-Saiz; Imanol de Pedro; Oriol Vallcorba; Pedro Migowski; Ignacio Hernández; Luis Fernández Barquin; Isaac Abrahams; Majid Motevalli; Jairton Dupont; Jesús Antonio Gonzalez; Jesús Rodríguez Fernández
Source:
RSC advances 2015 v.5 no.75 pp. 60835-60848
ISSN:
2046-2069
Subject:
Raman spectroscopy; X-ray diffraction; anions; anisotropy; bromine; cations; chlorides; chlorine; comparative study; crystal structure; ferrimagnetic materials; hydrogen bonding; imidazoles; ionic liquids; iron; magnetism; melting point; methylation; temperature
Abstract:
... Two novel paramagnetic ionic liquids, comprised of a 1-ethyl-2,3-dimethylimidazolium (Edimim) cation and a tetrahaloferrate(iii) (FeX₄) (X = Cl and Br) anion were synthetized and characterized by thermal, structural, Raman spectroscopy and magnetic studies. The crystal structures, determined by synchrotron X-ray powder diffraction and single crystal X-ray diffraction at 100 K for Edimim[FeCl₄] and ...
DOI:
10.1039/c5ra05723j

35. 1-Ethyl-3-methylimidazolium acetate ionic liquid as simple and efficient catalytic system for the oxidative depolymerization of alkali lignin

Author:
Wenbo Li; Yilin Wang; Dongchen Li; Jiachi Jiang; Kunlan Li; Kaili Zhang; Qingda An; Shangru Zhai; Ligang Wei
Source:
International journal of biological macromolecules 2021 v.183 pp. 285-294
ISSN:
0141-8130
Subject:
acetates; catalysts; cations; depolymerization; imidazoles; ionic liquids; lignin; molecular weight; oils
Abstract:
... The oxidative depolymerization of alkali lignin (AL) in 1-ethyl-3-methylimidazolium acetate ([C₂C₁im]OAc) system without additional catalyst was investigated under mild conditions (initial O₂ pressure of 1.5 MPa, 80 °C–100 °C). Compared with other ionic liquids (ILs), the cooperation of imidazolium cation and acetate anion successfully enhanced AL conversion. Among the investigated imidazolium ace ...
DOI:
10.1016/j.ijbiomac.2021.04.118

36. 1-und 2-Methylallylkationen aus isomeren Vinylbromidradikalkationen / 1-and 2-Methylallyl Cations from Cation Radicals of Isomeric Vinyl Bromides

Author:
Helmut Schwarz; Chrysostomos Wesdemiotis
Source:
Zeitschrift für Naturforschung B 2014 v.35 no.11 pp. 1486-1487
ISSN:
1865-7117
Subject:
bromine; cations; energy; free radicals; heat production; ionization; isomerization; mass spectrometry; organobromine compounds
Abstract:
... It is demonstrated by collisional activation mass spectrometry that dissociative ionization of E-and Z-1-bromobutene-1 (3, 4), 2-bromo-butene-1 (5) and 2-bromobutene-2 (6) yields exclusively 1-methylallyl cation (a). Unimolecular Br -loss from the molecular ion of 1-bromo-2-methylpropene (7) gives rise to the specific formation of the isomeric 2-methylallyl cation (b). Kinetic energy release measu ...
DOI:
10.1515/znb-1980-1135

37. 1.3-Dithienium-and 1.3-Dithiolenium Salts, VI ,13C NMR Spectroscopic Investigations on 2-Substituted 1,3-Dithian-2-ylium Cations. Unusual γ-Effects

Author:
Hans-Otto Kalinowski; Ingfried Stahl
Source:
Zeitschrift für Naturforschung 2014 v.52 no.6 pp. 757-761
ISSN:
0932-0776
Subject:
cations; electric field; nuclear magnetic resonance spectroscopy; salts; spectral analysis
Abstract:
... The ¹³C NMR chemical shifts of 19 2-substituted 1,3-dithian-2-ylium-tetrafluorborates 1a-1s are discussed in comparison to known analogous 1,3-dithianes and 2-lithio-1,3-dithianes. The unusual γ-effects (up to 9 ppm), which can also observed in other six-membered ring systems, are explained by the electric field effect (σ-polarisation effect). The electron density distribution can be estimated qua ...
DOI:
10.1515/znb-1997-0614

38. A 10 000‐Yr History of Natural Ecosystem Acidification

Author:
Mary S. (Jesse) Ford
Source:
Ecological monographs 1990 v.60 no.1 pp. 57-89
ISSN:
0012-9615
Subject:
Bacillariophyceae; Cyclotella; Mallomonas; Melosira; Picea; accidents; acidification; acidity; aluminum; aluminum silicates; aquatic ecosystems; aquifers; calcium; carbonates; cations; chemical bases; climatic factors; flora; gneiss; highlands; lakes; limestone; organic matter; pH; paleoecology; peat; plankton; pollen; sediments; silicon; soil acidification; soil profiles; sulfide minerals; surface water; upland soils; vegetation; watersheds; weathering; New England region; New Hampshire; Vermont
Abstract:
... This study examines natural, long—term (≈10⁴ yr) acidification processes in New England using paleoecological methods (pollen, diatoms, and the chemistry of three operationally defined sediment fractions) and a paired watershed approach.The primary variable is lithology, and the focus of this study is to illuminate the role of lithology in long—term ecosystem acidification. Unlike most cases of re ...
DOI:
10.2307/1943026

39. 110th Anniversary: Properties of Imidazolium-Based Ionic Liquids Bearing Both Benzylic and n-Alkyl Substituents

Author:
Jason E. Bara; Alexia Finotello; Joseph W. Magee; Shuai Qian; Kathryn E. O’Harra; Grayson P. Dennis; Richard D. Noble
Source:
Industrial & engineering chemistry process design and development 2019 v.58 no.38 pp. 17956-17964
ISSN:
1520-5045
Subject:
anions; carbon dioxide; cations; imidazoles; ionic liquids; process design; solubility; viscosity
Abstract:
... Reports of imidazoliumionic liquids (ILs) with at least one benzylic substituent bound to the imidazolium cation are far less common than the ubiquitous 1-alkyl-3-methylimidazolium ILs ([Cₙmim][X]). Yet, there is significant motivation to determine structure–property relationships for imidazolium-based ILs with at least one benzylic substituent. Not only are these ILs just as straightforward to sy ...
DOI:
10.1021/acs.iecr.9b03159

40. 11β Hydroxysteroid dehydrogenase type 2 and dietary acid load are independently associated with blood pressure in healthy children and adolescents

Author:
Danika Krupp; Lijie Shi; Christiane Maser-Gluth; Marion Pietzarka; Thomas Remer
Source:
American journal of clinical nutrition 2013 v.97 no.3 pp. 612-620
ISSN:
0002-9165
Subject:
adolescents; anions; biomarkers; blood pressure; body size; breast feeding; cations; children; clinical nutrition; cortisol; cortisone; energy; excretion; food intake; linear models; radioimmunoassays; urine; vegetables
Abstract:
... Background: The reduced activity of 11β hydroxysteroid dehydrogenase type 2 (11βHSD2) contributes to elevated blood pressure (BP) in clinical syndromes, but its effect on BP in the physiologic range is unclear.Objectives: We examined the association of 11βHSD2 activity with BP in healthy children independent of known BP-related dietary and other factors and determined whether the diet-dependent ac ...
DOI:
10.3945/ajcn.112.047829

41. The 137Cs activity concentration of suspended and dissolved fractions in irrigation waters collected from the 80 km zone around TEPCO's Fukushima Daiichi Nuclear Power Station

Author:
Hirofumi Tsukada; Satoshi Nihira; Takashi Watanabe; Satoru Takeda
Source:
Journal of environmental radioactivity 2017 v.178-179 pp. 354-359
ISSN:
0265-931X
Subject:
cations; cesium; electrical conductivity; geometry; irrigation water; nuclear power; ponds; power plants; radioactivity; radionuclides; rivers; soil; stable isotopes
Abstract:
... Fifty-four samples of irrigation water were collected in 2014 from agricultural ponds, rivers, and dams within the 80 km zone around TEPCO's Fukushima Daiichi Nuclear Power Station (FDNPS). The samples were filtered with a 0.45 μm pore-size membrane filter to produce suspended and dissolved fractions. The ¹³⁷Cs activity concentration of the suspended fraction varied from 1.5 to 300 Bq g⁻¹ dry weig ...
DOI:
10.1016/j.jenvrad.2017.08.002

42. 13C-Nuclear Magnetic Resonance Investigations of Xanthine and Some of its N-Methylated Derivatives

Author:
Claude Nicolau; Knut Hildenbrand
Source:
Zeitschrift für Naturforschung 2014 v.29 no.9-10 pp. 475-478
ISSN:
1865-7125
Subject:
caffeine; cations; theobromine; theophylline; xanthine
Abstract:
... The ¹³C-Nuclear Magnetic Resonance spectra of xanthine, 1,3-dimethyl-xanthine (theophylline), 3,7-dimethyl xanthine (theobromine) and 1,3,7-trimethylxanthine (caffeine) were obtained and the lines assigned. Protonation-and N-Methylation parameters are derived by comparison of the 13C-chemical shifts of the protonated cations with those of the neutral molecules and also with those of the xanthine c ...
DOI:
10.1515/znc-1974-9-1004

43. 15N Nucelar Magnetic Resonance Study of Two-Coordinate Phosphorus Cations - Sign-Determination of Coupling Constants – Application of Two-Dimensional (2D) Heteronuclear Shift Correlations

Author:
Bernd Wrackmeyer; Jürgen Schiller
Source:
Zeitschrift für Naturforschung 2014 v.47 no.5 pp. 662-667
ISSN:
0932-0776
Subject:
carbenes; carbon; cations; chlorides; electrons; magnetism; nitrogen; nuclear magnetic resonance spectroscopy; phosphorus; stable isotopes
Abstract:
... Cyclic and non-cyclic bis(amino)phosphenium cations (1 to 4) together with their precursors (bis(amino)phosphorus chlorides 5 to 8) and some other bis(amino)phosphorus compounds (9 to 14) have been studied by ¹³C, ¹⁵N (natural abundance), ²⁹Si and ³¹P NMR spectroscopy. ¹⁵N chemical shifts and coupling constants ¹J(³¹P¹⁵N) of phosphenium cations have been determined for the first time. NMR data of ...
DOI:
10.1515/znb-1992-0509

44. 17% efficient printable mesoscopic PIN metal oxide framework perovskite solar cells using cesium-containing triple cation perovskite

Author:
Shungshuang Liu; Wenchao Huang; Peizhe Liao; Nuttapol Pootrakulchote; Hao Li; Jianfeng Lu; Junpeng Li; Feihong Huang; Xuxia Shai; Xiaojuan Zhao; Yan Shen; Yi-Bing Cheng; Mingkui Wang
Source:
Journal of materials chemistry A 2017 v.5 no.44 pp. 22952-22958
ISSN:
2050-7496
Subject:
carbon electrodes; cations; chemistry; electric current; energy; lighting; porous media; solar cells; spectroscopy
Abstract:
... Fully printable perovskite solar cells (PSCs) based on an inorganic metal oxide architecture have attracted tremendous attention due to its feature of showing principally high stability. However, fully printable PSCs show a lower power conversion efficiency (PCE) than the thin film PSCs owing to the thick mesoscopic layers that pose an obstacle to charge collection. Herein, the triple cation perov ...
DOI:
10.1039/c7ta07660f

45. 18-Crown-6–Sodium Cholate Complex: Thermochemistry, Structure, and Stability

Author:
Mihelj Tea; Tomašić Vlasta; Biliškov Nikola
Source:
Langmuir 2014 v.30 no.21 pp. 6274-6285
ISSN:
1520-5827
Subject:
ambient temperature; bile salts; cations; chemical structure; coordination compounds; differential scanning calorimetry; ethers; heat treatment; infrared spectroscopy; liquids; microscopy; molecular models; phase transition; sodium; surfactants; thermal properties; thermogravimetry
Abstract:
... 18-Crown-6, one of the most relevant crown ethers, and sodium cholate, a steroidal surfactant classified as a natural bile salt, are components of a novel, synthesized coordination complex: 18-crown-6–sodium cholate (18C6·NaCh). Like crown ethers, bile salts act as building blocks in supramolecular chemistry to design new functionalized materials with a desired structure and properties. In order t ...
DOI:
10.1021/la501155s

46. 1:1-Salze des organischen Donors Tetra(methylthio)tetrathiafulvalen und Bis(maleonitriIdithiolato)-Komplexen: (TTM-TTF)+[Ni(mnt)2]- und (TTM-TTF)+[ Pt(mnt)2]- / 1:1 Salts of the Organic Donor Tetra(methylthio)tetrathiafulvalene and Bis(maleonitriledithiolate) Complexes: (TTM -TTF)+[Ni(mnt)2]- and (TTM -TTF)+[Pt(mnt)2]-

Author:
Karl Brunn; Helmut Endres; Johannes Weiss
Source:
Zeitschrift für Naturforschung 2014 v.42 no.10 pp. 1222-1226
ISSN:
0932-0776
Subject:
anions; cations; nickel; salts; tetraethylammonium compounds
Abstract:
... (TTM-TTF)⁺[Ni(mnt)₂]⁻ and (TTM-TTF)⁺ [Pt(mnt)₂]⁻ {TTM-TTF = Tetra(methylthio)tetra- thiafulvalene. mnt = maleonitriledithiolate} were obtained as products of the reactions of TTM-TTF with [Et₄N][Ni(mnt)₂] and [Et₄N][Pt(mnt)₂]. (TTM-TTF)⁺ [Ni(mnt)₂]⁻ is tridinic. P1, a = 7.650(2), b = 9.671(3). c = 9.846(4) Å. α = 103.47(3)°, β = 101.76(3)°, γ = 91.73(3)°, V = 691³ Å. Z = 1, dc = 1.75 g cm⁻³. For t ...
DOI:
10.1515/znb-1987-1002

47. 1H NMR studies of molecular interaction of D-glucosamine and N-acetyl-D-glucosamine with capsaicin in aqueous and non-aqueous media

Author:
Inocencio Higuera-Ciapara; Claudia Virués; Marcela Jiménez-Chávez; Evelin Martínez-Benavidez; Javier Hernández; Zaira Domínguez; Roberto López-Rendón; Enrique F. Velázquez; Motomichi Inoue
Source:
Carbohydrate research 2017 v.452 pp. 6-16
ISSN:
0008-6215
Subject:
N-acetylglucosamine; bioactive compounds; capsaicin; cations; chitosan; deuterium oxide; dimethyl sulfoxide; glucosamine; hot peppers; hydrogen bonding; isomers; models; monosaccharides; nanocarriers; nuclear magnetic resonance spectroscopy; stoichiometry; thermodynamics; titration; van der Waals forces
Abstract:
... Complex formation of D-glucosamine (Gl) and N-acetyl-D-glucosamine (AGl) with capsaicin (Cp) were studied by 1H NMR titrations in H2O-d2 and DMSO-d6; capsaicin is the major bioactive component of chili peppers. Every titration curve has been interpreted by formulating a suitable model for the reaction equilibrium, to elucidate intermolecular interactions. In DMSO, glucosamine cations associate wit ...
DOI:
10.1016/j.carres.2017.09.014

48. 1H and 13C NMR Spectroscopic Evidence for the Complexation of Potassium Cations by Cyclohexanedioxydiacetamides

Author:
Whei Oh Lin; Helmut G. Alt
Source:
Zeitschrift für Naturforschung B 2014 v.40 no.3 pp. 441-442
ISSN:
1865-7117
Subject:
carbon; cations; nuclear magnetic resonance spectroscopy; potassium; spectral analysis; stable isotopes
Abstract:
... The complexation of cyclohexanedioxydiacetamides by K⁺ cations may be studied by ¹H and ¹³C NMR spectroscopy. ...
DOI:
10.1515/znb-1985-0323

49. 1H-, 14N- und 31P-KMR-Untersuchungen an paramagnetischen Ionenassoziaten

Author:
H. P. Fritz; W. Gretner; H. J. Keller; K. E. Schwarzhans
Source:
Zeitschrift für Naturforschung 2014 v.25 no.2 pp. 174-176
ISSN:
0932-0776
Subject:
anions; cations; cobalt; nickel; nitrogen; phosphorus; stable isotopes
Abstract:
... The strongly concentration dependent ¹H, ¹⁴N and ³¹P n.m.r. shifts of some paramagnetic ionic compounds of the general formula [ (C₄H₉) ₄Y] {M [P (C₆H₅)₃]X₃} with Y=N and P, M = Co (II)and Ni (II) are reported and discussed in relation to the recently postulated “ion pairs” in solution. The results indicate a strong direct interaction between the paramagnetic anions and the diamagnetic cations in ...
DOI:
10.1515/znb-1970-0210

50. 1H-NMR sequential assignments and cation-binding studies of spinach plastocyanin

Author:
Driscoll, P.C.; Hill, H.A.O.; Redfield, C.
Source:
European journal of biochemistry 1987 v.170 no.1/2 pp. 279-292
ISSN:
0014-2956
Subject:
Spinacia oleracea; cations; nuclear magnetic resonance spectroscopy; binding sites
DOI:
10.1111/j.1432-1033.1987.tb13697.x

51. 1H-Pteridine-2,4-dione (lumazine): a new MALDI matrix for complex (phospho)lipid mixtures analysis

Author:
Calvano, Cosima D.; Carulli, Saverio; Palmisano, Francesco
Source:
Analytical and bioanalytical chemistry 2010 v.398 no.1 pp. 499-507
ISSN:
1618-2642
Subject:
2,5-dihydroxybenzoic acid; absorption; cations; desorption; eggs; hens; ionization; mass spectrometry; milk; phosphatidylcholines; phosphatidylethanolamines; phosphatidylglycerols; phosphatidylinositols; phosphatidylserines; soymilk; sphingomyelins
Abstract:
... Nowadays, matrix-assisted laser desorption/ionization (MALDI) time-of-flight mass spectrometry represents an emerging and versatile tool for analysis of lipids. However, direct (i.e., with no previous separation of lipid classes) analysis of crude extracts containing a complex mixture of lipids (a problem typically encountered in shotgun lipidomics) is still a quite challenging task using a conven ...
DOI:
10.1007/s00216-010-3927-x
PubMed:
20593166

52. 1H/13C chemical shifts and cation binding dataset of the corticosteroid Prednisolone titrated with metal cations

Author:
Kathleen Joyce D. Carillo; Danni Wu; Su-Ching Lin; Shen-Long Tsai; Jiun-Jie Shie; Der-Lii M. Tzou
Source:
Data in Brief 2019 v.27 pp. 104620
ISSN:
2352-3409
Subject:
Gibbs free energy; adrenal cortex hormones; calcium; cations; computer software; data collection; magnesium; nuclear magnetic resonance spectroscopy; prednisolone; spectrometers
Abstract:
... We here reported the ¹H/¹³C chemical shifts, binding affinity and binding free energy of 1,4-pregnadiene-11β,17α,21-triol-3,20-dione (Prednisolone; Prd) interacting with metal cations. Six different Prd/Ni or Co mixtures were examined at different molar ratios (1:0, 1:0.1, 1:0.2, 1:0.3, 1:0.4 and 1:0.5). In this analysis, the ¹H and ¹³C chemical shifts were measured for the Prd/cation mixtures usi ...
DOI:
10.1016/j.dib.2019.104620

53. 1H–1H Double Quantum NMR Investigation of Proton Dynamics in Solid Acids

Author:
De Almeida Nicole E.; Harris Kristopher J.; Samoson Ago; Goward Gillian R.
Source:
The Journal of Physical Chemistry C 2016 v.120 no.36 pp. 19961-19969
ISSN:
1932-7455
Subject:
acids; adenine; anions; benzimidazole; cations; dielectric spectroscopy; evaporation; fuel cells; hydrogen bonding; nuclear magnetic resonance spectroscopy; protons; salts; temperature
Abstract:
... Currently, the most popular proton exchange membrane (PEM) for fuel cell applications is Nafion. However, Nafion does not retain its high conductivity at high temperatures due to its dependence on water for proton transport. Because operational temperatures higher than the evaporation point of water are desirable, a family of solid acids was investigated. Cations known to transport protons were pa ...
DOI:
10.1021/acs.jpcc.6b04394

54. 2,11-Dibromo-13,14-dimesityl-5,8-dioxapentaphene: A Stable and Twisted Polycyclic System Containing the o-Quinodimethane Skeleton

Author:
Sato Chihiro; Suzuki Shuichi; Kozaki Masatoshi; Okada Keiji
Source:
Organic letters 2016 v.18 no.5 pp. 1052-1055
ISSN:
1523-7052
Subject:
X-radiation; absorption; cations; chemical reactions; chemical structure; organic compounds; spectral analysis
Abstract:
... A stable o-quinodimethane (oQDM) derivative, 2,11-dibromo-13,14-dimesityl-5,8-dioxapentaphene (3) was synthesized, and its structure and properties were investigated. The X-ray structural analysis showed a significantly twisted π-framework and a clear bond-length alternation in the central oQDM skeleton. Owing to the quinoidal conjugation, 3 exhibited a broad absorption band in the visible region ...
DOI:
10.1021/acs.orglett.6b00171

55. 2,2'-Azinobis(3-ethylbenzothiazoline-6-sulfonic acid) radical cation assay to a flow injection system for the evaluation of antioxidant activity of some pure compounds and beverages

Author:
Pellegrini, N.; Del Rio, D.; Colombi, B.; Bianchi, M.; Brighenti, F.
Source:
Journal of agricultural and food chemistry 2003 v.51 no.1 pp. 260-264
ISSN:
0021-8561
Subject:
tea; coffee (beverage); assays; cations; phenolic compounds; detectors; oxidation; soft drinks; fruit juices; beers
Abstract:
... The 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) radical cation (ABTS radical cation) assay was adapted to a flow injection (FI) system to obtain a sensitive and rapid technique for the monitoring of antioxidant activity of pure compounds and complex matrixes, such as beverages and food extracts. The FI system includes a HPLC pump that flows the mobile phase (a solution of ABTS radical ca ...
DOI:
10.1021/jf020657z

56. 2,2′-Spirobis[chromene] Derivatives Chemistry and Their Relation with the Multistate System of Anthocyanins

Author:
Moro Artur J.; Parola A. Jorge; Pina Fernando; Pana Ana-Maria; Badea Valentin; Pausescu Iulia; Shova Sergiu; Cseh Liliana
Source:
Journal of organic chemistry 2017 v.82 no.10 pp. 5301-5309
ISSN:
1520-6904
Subject:
X-ray diffraction; anthocyanins; cations; isomers; moieties; nuclear magnetic resonance spectroscopy; organic chemistry; photoisomerization
Abstract:
... The chemistry of 2,2′-spirobis[chromene] derivatives is intimately related to the one of anthocyanins and similar compounds. The 2,2′-spirobis[chromene] species plays a central role in the network of chemical reactions connecting two different flavylium-based multistate systems. In the present work, a new asymmetric 2,2′-spirobis[chromene] intermediate possessing a constrained propylenic bridge be ...
DOI:
10.1021/acs.joc.7b00634

57. A 2,3-dialkoxynaphthalene-based naphthocage

Author:
Song-Bo Lu; Hongxin Chai; Jas S. Ward; Mao Quan; Jin Zhang; Kari Rissanen; Ray Luo; Liu-Pan Yang; Wei Jiang
Source:
Chemical communications 2020 v.56 no.6 pp. 888-891
ISSN:
1364-548X
Subject:
cations; chemical reactions; tetraethylammonium compounds; tetramethylammonium compounds
Abstract:
... A 2,3-dialkoxynaphthalene-based naphthocage has been synthesized. This naphthocage prefers to bind small organic cations with its low-symmetry conformation, which is in contrast to 2,6-dialkoxynaphthalene-based naphthocages. Self-sorting of these two naphthocages with two structurally similar guests tetramethylammonium and tetraethylammonium was achieved as well. ...
DOI:
10.1039/c9cc09585c

58. 2,4-Dinitrophenylhydrazine functionalized sodium dodecyl sulfate-coated magnetite nanoparticles for effective removal of Cd(II) and Ni(II) ions from water samples

Author:
Soheil Sobhanardakani; Raziyeh Zandipak
Source:
Environmental monitoring and assessment 2015 v.187 no.7 pp. 412
ISSN:
0167-6369
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; adsorbents; adsorption; aqueous solutions; cadmium; cations; magnetite; models; nanoparticles; nickel; pH; river water; sampling; scanning electron microscopy; sodium; sodium dodecyl sulfate; tap water; temperature; testing; wastewater
Abstract:
... 2,4-Dinitrophenylhydrazine immobilized on sodium dodecyl sulfate (SDS)-coated magnetite and was used for removal of Cd(II) and Ni(II) ions from aqueous solution. The prepared product was characterized by X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The size of the nanoparticles according to SEM was obtained around 20–35  ...
DOI:
10.1007/s10661-015-4635-y

59. 2,5,8,11-Tetra-tert-butyl-peri-xanthenoxanthene and its Dication Spectroelectrochemistry and Model Calculations on a Dioxa-22-π-system

Author:
Gernot Frenking; Anton Rieker; Josef Salbeck; Bernd Speiser
Source:
Zeitschrift für Naturforschung 2014 v.51 no.3 pp. 377-380
ISSN:
0932-0776
Subject:
cations; models; quantum mechanics
Abstract:
... Spectroelectrochemistry of 2,5,8,1 1-tetra-tert-butyl-peri-xanthenoxanthene 1 yields the UV/VIS spectra of the corresponding radical cation 1⁺ and dication 1²⁺. The bathochromic shift for the dication 1²⁺ relative to 1 and to the isoelectronic hydrocarbon anthanthrene (2) can be understood by quantum mechanical calculations (ab initio, AM1) of model structures. ...
DOI:
10.1515/znb-1996-0313

60. 2-(2′-Hydroxyphenyl)-4(3H)-quinazolinone derivatives based fluorescent probes for mercury(II) via an intramolecular proton transfer mechanism

Author:
Wei-Jun Zhang; Jing Peng; Li-Min Lu; Jing Zhang; Xiao-Bing Zhang
Source:
International journal of environmental analytical chemistry 2012 v.92 no.7 pp. 810-820
ISSN:
1029-0397
Subject:
cations; dyes; fluorescence; mercury; pH; river water
Abstract:
... 2-(2′,5′-Dihydroxy-phenyl)-4(3H)-quinazolinone (DHPQ), a new fluorescent dye that exhibits excited state intramolecular proton transfer (ESIPT) reaction and possesses good photophysical properties, is synthesised and used as fluorescent probe for detection of Hg²⁺. Mercuric ions can be detected and quantitated by measuring the fluorescent intensity decrease of the probe. The decrease of fluorescen ...
DOI:
10.1080/03067319.2010.510602

61. 2-(Phenylethyl)ammonium hydrogensquarate hemihydrate: crystal structure, solid-state IR-spectroscopic and theoretical characterization

Author:
Ivanova, Bojidarka B.; Seidel, Rüdiger W.; Kolev, Tsonko; Sheldrick, William; Spiteller, Michael
Source:
Amino acids 2010 v.39 no.1 pp. 309-314
ISSN:
0939-4451
Subject:
X-ray diffraction; anions; cations; colloids; crystal structure; hydrogen bonding; infrared spectroscopy; solvents
Abstract:
... The title compound, 2-(phenylethyl)ammonium hydrogensquarate hemihydrate, was synthesized and structurally and spectroscopically characterized by a single crystal X-ray diffraction and solid-state polarized IR spectroscopy of oriented colloids in a nematic host. The crystal structure consists of two crystallographically independent 2-(phenylethyl)ammonium cations, joined in a 2D hydrogen-bonded ne ...
DOI:
10.1007/s00726-009-0451-4
PubMed:
20082103

62. 2-Aminoimidazole borohydride as a hydrogen carrier

Author:
Yong Wu; Yue Qi; Jun Chen; He Fu; Jie Zheng; Xingguo Li
Source:
RSC advances 2016 v.6 no.105 pp. 103299-103303
ISSN:
2046-2069
Subject:
cations; dehydrogenation; hydrogen; milling; sodium borohydride; sodium sulfate; temperature
Abstract:
... 2-Aminoimidazole borohydride (Im-NH₂BH₄) is synthesized via the reaction between 2-aminoimidazole hemisulfate ((Im-NH₂)₂SO₄) and sodium borohydride by a simple ball milling method. This compound holds theoretical hydrogen capacity of 8.1 wt%. It is designed based on the strategy of destabilizating BH₄⁻ using a large conjugated cation, Im-NH₂⁺ and maximizing the protonic-hydridic hydrogen interacti ...
DOI:
10.1039/c6ra21335a

63. 2-Azaallyl Anions, 2-Azaallyl Cations, 2-Azaallyl Radicals, and Azomethine Ylides

Author:
Shaojian Tang; Xia Zhang; Jiayue Sun; Dawen Niu; Jason J. Chruma
Source:
Chemical reviews 2018 v.118 no.20 pp. 10393-10457
ISSN:
1520-6890
Subject:
anions; cations; free radicals
Abstract:
... This review covers the use of 2-azaallyl anions, 2-azaallyl cations, and 2-azaallyl radicals in organic synthesis up through June 2018. Particular attention is paid to both foundational studies and recent advances over the past decade involving semistabilized and nonstabilized 2-azaallyl anions as key intermediates in various carbon–carbon and carbon–heteroatom bond-forming processes. Both transit ...
DOI:
10.1021/acs.chemrev.8b00349

64. The 2D Halide Perovskite Rulebook: How the Spacer Influences Everything from the Structure to Optoelectronic Device Efficiency

Author:
Xiaotong Li; Justin M. Hoffman; Mercouri G. Kanatzidis
Source:
Chemical reviews 2021 v.121 no.4 pp. 2230-2291
ISSN:
1520-6890
Subject:
cations; fields; guidelines; halides; optical properties; prediction; semiconductors; wills
Abstract:
... Two-dimensional (2D) halide perovskites have emerged as outstanding semiconducting materials thanks to their superior stability and structural diversity. However, the ever-growing field of optoelectronic device research using 2D perovskites requires systematic understanding of the effects of the spacer on the structure, properties, and device performance. So far, many studies are based on trial-an ...
DOI:
10.1021/acs.chemrev.0c01006

65. 2D–3D Mixed Organic–Inorganic Perovskite Layers for Solar Cells with Enhanced Efficiency and Stability Induced by n-Propylammonium Iodide Additives

Author:
Disheng Yao; Chunmei Zhang; Shengli Zhang; Yang Yang; Aijun Du; Eric Waclawik; Xiaochen Yu; Gregory J. Wilson; Hongxia Wang
Source:
ACS applied materials & interfaces 2019 v.11 no.33 pp. 29753-29764
ISSN:
1944-8252
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; additives; air; cations; contact angle; density functional theory; encapsulation; energy; hydrophobicity; hysteresis; industrial applications; oxygen; relative humidity; solar cells; solar energy; surface water; wettability
Abstract:
... Device instability has become an obstacle for the industrial application of organic–inorganic metal halide perovskite solar cells that has already demonstrated over 23% laboratory power conversion efficiency (PCE). It has been discovered that the sliding of A-site cations in the perovskite compound through and out of the three-dimensional [PbI₆]⁴– crystal frame is one of the main reasons that are ...
DOI:
10.1021/acsami.9b06305

66. 3,6-Dioxypyridazine bridged tungsten–tungsten quadruple bonds. Comparisons of electron delocalisation with oxalate bridged compounds

Author:
Malcolm H. Chisholm; Robin J. H. Clark; Christopher M. Hadad; Nathan J. Patmore
Source:
Chemical communications 2003 v. no.1 pp. 80-82
ISSN:
1364-548X
Subject:
cations; chemical reactions; oxalates
Abstract:
... The preparation and characterisation of the tungsten–tungsten quadruply bonded, 3,6-dioxypyridazine bridged complex [(ᵗBuCO₂)₃W₂]₂(μ-H₂C₄N₂O₂) and its single electron oxidised radical cation are reported and, when compared with related bridged dimolybdenum complexes, reveal a different mechanism of electronic coupling from that seen in related oxalate bridged systems. ...
DOI:
10.1039/b310982h

67. 3-(Ethoxycarbonyl)-1-(5-methyl-5-(nitrosooxy)hexyl)pyridin-1-ium cation: A green alternative to tert-butyl nitrite for synthesis of nitro-group-containing arenes and drugs at room temperature

Author:
Palani Natarajan; Renu Chaudhary; Neetu Rani; Sakshi; Paloth Venugopalan
Source:
Tetrahedron letters 2020 v.61 no.9 pp. 151529
ISSN:
0040-4039
Subject:
ambient temperature; aromatic hydrocarbons; biodegradability; byproducts; cations; chemical reactions; chemical structure; drugs; imides; ionic liquids; niclosamide; nitrites; nitroaromatic compounds; nitroxinil; stoichiometry
Abstract:
... Due to their remarkable properties, task-specific ionic liquids have turned out to be progressively popular over the last few years in the field of green organic synthesis. Herein, for the first time, we report that a new task-specific nitrite-based ionic liquid such as 3-(ethoxycarbonyl)-1-(5-methyl-5-(nitrosooxy)hexyl)pyridin-1-ium bis(trifluoromethanesulfonyl)imides (TS-N-IL) derived from biode ...
DOI:
10.1016/j.tetlet.2019.151529

68. 3-Acylated tetramic and tetronic acids as natural metal binders: myth or reality?

Author:
Mehdi Zaghouani; Bastien Nay
Source:
Natural product reports 2016 v.33 no.4 pp. 540-548
ISSN:
1460-4752
Subject:
acids; cations; chelates; chelating agents; mechanism of action; physicochemical properties; salts
Abstract:
... Covering: up to 2015 3-Acylated tetramic and tetronic acids are characterized by a low pKₐ and are likely to be deprotonated under physiological conditions. In addition, their structure makes them excellent chelators of metallic cations. We will discuss the significance of these chemical properties with regard to the biological properties and mechanisms of action of these compounds, highlighting t ...
DOI:
10.1039/c5np00144g

69. 3-Aminopropyltrimethoxysilane and graphene oxide/reduced graphene oxide-induced generation of gold nanoparticles and their nanocomposites: electrocatalytic and kinetic activity

Author:
P. C. Pandey; Shubhangi Shukla; Yashashwa Pandey
Source:
RSC advances 2016 v.6 no.84 pp. 80549-80556
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; catalytic activity; cations; energy-dispersive X-ray analysis; formaldehyde; gold; graphene; graphene oxide; nanocomposites; nanogold; nanohybrids; nanoparticles; oxygen; transmission electron microscopy
Abstract:
... The role of graphene oxide (GO)/reduced graphene oxide (rGO) in the 3-aminopropyltrimethoxysilane (3-APTMS)-mediated synthesis of gold nanoparticles (AuNPs) in the presence of formaldehyde is reported. It was found that 3-APTMS-functionalized GO/rGO allowed the rapid conversion of gold cations into AuNPs in the presence of formaldehyde. Moreover, the major findings include (i) the process of nanop ...
DOI:
10.1039/c6ra18731e

70. 3-Formyl- and 3-Bromo-N-Methylcytisine Derivatives

Author:
U. S. Makhmudov; Sh. B. Rakhimov; V. I. Vinogradova; B. Tashkhodzhaev
Source:
Chemistry of natural compounds 2018 v.54 no.4 pp. 735-738
ISSN:
0009-3130
Subject:
Thermopsis; alkaloids; cations; crystal structure; nuclear magnetic resonance spectroscopy; perchlorates
Abstract:
... 3-Formyl- and 3-bromo-N-methylcytisine derivatives of the alkaloid N-methylcytisine from Thermopsis alterniflora were synthesized. Their structures were established using NMR spectroscopy and X-ray crystal structure analyses. The crystal structure of 3-formyl-N-methylcytisine perchlorate involves two protonated cations mutually bonded by a bifurcated N–H…O H-bond. A Br…O donor–acceptor interaction ...
DOI:
10.1007/s10600-018-2458-0

71. 3-Formyl-2-arylbenzofurans from the aerial parts of Itea ilicifolia

Author:
Guoyong Luo; Min Zhou; Yan Liu; Qi Ye; Jian Gu; Tianfang Huang; Guolin Zhang; Yinggang Luo
Source:
Phytochemistry letters 2014 v.10 pp. 19-22
ISSN:
1874-3900
Subject:
Itea; X-ray diffraction; aerial parts; cations; ethanol; free radical scavengers; inhibitory concentration 50; nuclear magnetic resonance spectroscopy; spectral analysis
Abstract:
... Two new 3-formyl-2-arylbenzofurans, iteafuranals A and B, were isolated from the 95% EtOH extract of the aerial parts of Itea ilicifolia. Their structures were elucidated as (E)-2-(3,4-dihydroxyphenyl)-3-formyl-4-hydroxy-5-(prop-1-en-1-yl)benzofuran (1, iteafuranal A) and (E)-2-(3-hydroxy-4-methoxyphenyl)-3-formyl-4-hydroxy-5-(prop-1-en-1-yl)benzofuran (2, iteafuranal B) by comprehensive analyses ...
DOI:
10.1016/j.phytol.2014.06.019

72. 3-Methylimidazolium bromohydrogenates(i): a room-temperature ionic liquid for ether cleavage

Author:
G. Driver; K. E. Johnson
Source:
Green chemistry 2003 v.5 no.2 pp. 163-169
ISSN:
1463-9270
Subject:
ambient temperature; bromides; carbon; cations; ethers; green chemistry; hydrobromic acid; ionic liquids; liquids; organobromine compounds; phenols; stable isotopes
Abstract:
... ¹H- and ¹³C{¹H}-NMR indicate that the liquid formed at room temperature from 1 mole of 1-methylimidazole and 2 moles of anhydrous HBr contains the 3-methylimidazolium cation (Hmim⁺) and an equilibrium anionic mixture of Br⁻, HBr₂⁻, and H₂Br₃⁻. This liquid cleaves ethers efficiently, producing the corresponding bromides and alcohols from cyclic and straight-chain dialkyl ethers and phenols and alky ...
DOI:
10.1039/b211548d

73. 3-Triethylammonium propane sulfonate ionic liquids for Nafion-based composite membranes for PEM fuel cells

Author:
Letícia Zanchet; Letícia Guerreiro da Trindade; William Bariviera; Katiúscia M. Nobre Borba; Rapher Donizete Moreira Santos; Valdecir Antonio Paganin; Cristiane Pontes de Oliveira; Edson Antonio Ticianelli; Emilse Maria Agostini Martini; Michèle Oberson de Souza
Source:
Journal of materials science 2020 v.55 no.16 pp. 6928-6941
ISSN:
0022-2461
Subject:
asymmetric membranes; cations; fuel cells; hydrogen; hydrophilicity; ionic liquids; propane; sulfates; sulfonates; sulfonic acids; thermal stability
Abstract:
... The 3-triethylammonium propane sulfonic (TEA-PS⁺) cation associated with the anion tetrafluoroborate, hydrogen sulfate or trifluoromethanesulfonate leads to the formation of the new protic ionic liquids (ILs) 3-triethylammonium propane sulfonic acid tetrafluoroborate (TEA-PS·BF₄), 3-triethylammonium propane sulfonic acid hydrogen sulfate (TEA-PS·HSO₄) and 3-triethylammonium propane sulfonic acid t ...
DOI:
10.1007/s10853-020-04454-4

74. 3-t-Butyl-1-methylcyclobutyl Cation. Experimental vs Computational Insights into Tertiary Bicyclobutonium Cations

Author:
Xavier Creary
Source:
Journal of organic chemistry 2020 v.85 no.11 pp. 7086-7096
ISSN:
1520-6904
Subject:
cations; organic chemistry; solvents; solvolysis; stereochemistry
Abstract:
... The stereochemistry of the substitution product formed when (1s,3s)-3-(tert-butyl)-1-methylcyclobutyl methanesulfonate, 7, reacts in trifluoroethanol is one of retention of configuration. This is consistent with the intermediacy of a nonclassical bicyclobutonium cation 8N. As the solvent becomes less highly ionizing, the product contains increasing amounts of the isomeric inverted product. This is ...
DOI:
10.1021/acs.joc.0c00472

75. 34. Designing next generation protectants

Author:
Gloria Elliot; Lindong Weng
Source:
Cryobiology 2015 v.71 no.1 pp. 173-174
ISSN:
0011-2240
Subject:
anions; cations; cryoprotectants; crystallization; differential scanning calorimetry; glass; glass transition temperature; glycerol; hydrogen bonding; mixing; molecular dynamics; prediction; proteins; sodium phosphate; toxicity; trehalose; vitrification
Abstract:
... In order to advance towards the vitrification of complex organs, further advances in cryoprotectant compositions will be necessary. Systematic solution optimization has enabled the identification of superior combinations of cryoprotectants for various cell and tissue types, yet the range of chemicals used as protectants is still quite narrow and it is oftentimes not well understood why some compos ...
DOI:
10.1016/j.cryobiol.2015.05.040

76. 35-year trends of acidity and soluble nutrients in cultivated soils of Finland

Author:
Riikka Keskinen; Elise Ketoja; Jaakko Heikkinen; Tapio Salo; Risto Uusitalo; Visa Nuutinen
Source:
Geoderma regional 2016 v.7 no.4 pp. 376-387
ISSN:
2352-0094
Subject:
acidity; agricultural soils; arable soils; calcium; cations; clay; cropping systems; food production; issues and policy; magnesium; mineral soils; monitoring; mull; nutrients; pH; peat soils; planting; risk; soil fertility; topsoil; Finland
Abstract:
... Nutrient status of arable soils is linked to food production potential and environmental risks. The use of nutrients is affected by policy measures, which formulation calls for data on the long-term development of soil fertility. In Finland, the chemical status (pH4.65 ammonium acetate-extractable nutrients and pHw) of cultivated topsoils has been surveyed at the same sites in 1974 (n=1835), 1987, ...
DOI:
10.1016/j.geodrs.2016.11.005

77. 3D Structures and Redox Potentials of Cu2+–Aβ(1–16) Complexes at Different pH: A Computational Study

Author:
Alí-Torres Jorge; Mirats Andrea; Maréchal Jean-Didier; Rodríguez-Santiago Luis; Sodupe Mariona
Source:
Journal of physical chemistry 2014 v.118 no.18 pp. 4840-4850
ISSN:
1520-5207
Subject:
Alzheimer disease; cations; copper; electrodes; geometry; hydrogen; ligands; models; oxidative stress; pH; physical chemistry; redox potential
Abstract:
... Oxidative stress induced by redox-active metal cations such as Cu²⁺ is a key event in the development of Alzheimer’s disease. A detailed knowledge of the structure of Cu²⁺–Aβ complex is thus important to get a better understanding of this critical process. In the present study, we use a computational approach that combines homology modeling with quantum-mechanics-based methods to determine plausib ...
DOI:
10.1021/jp5019718

78. 3D direct writing egg white hydrogel promotes diabetic chronic wound healing via self-relied bioactive property

Author:
Lingling Guo; Xingtang Niu; Xihang Chen; Feng Lu; Jianhua Gao; Qiang Chang
Source:
Biomaterials 2022 v.282 pp. 121406
ISSN:
0142-9612
Subject:
biocompatible materials; cations; collagen; crosslinking; cytotoxicity; drugs; egg albumen; fibroblasts; gelation; hydrogels; strength (mechanics); three-dimensional printing; wound treatment
Abstract:
... Recent developments have evidenced the remarkable achievements of hydrogel combining drugs or growth factors delivery on diabetic chronic wound management. However, these techniques remain unsatisfactory and are impeded by high-cost, complex purification or fabrication, sophisticated drug loading, and lacking versatile therapeutic effects into one platform. Herein, a natural hydrogel is presented ...
DOI:
10.1016/j.biomaterials.2022.121406

79. 3d-Metal Induced Magnetic Ordering on U(IV) Atoms as a Route toward U(IV) Magnetic Materials

Author:
Vladislav V. Klepov; Kristen A. Pace; Stuart Calder; Justin B. Felder; Hans-Conrad zur Loye
Source:
Journal of the American Chemical Society 2019 v.141 no.9 pp. 3838-3842
ISSN:
1520-5126
Subject:
cations; cobalt; ferrimagnetic materials; fluorides; magnetic properties; magnetism; manganese; metal ions; neutron diffraction; nickel; phase transition; temperature; uranium; zinc
Abstract:
... Uranium(IV) 5f² magnetism is dominated by a transition from a triplet to a singlet ground state at low temperatures. For the first time, we achieved magnetic ordering of U(IV) atoms in a complex fluoride through the incorporation of 3d transition metal cations. This new route allowed us to obtain an unprecedented series of U(IV) ferrimagnetic materials of the new composition Cs₂MU₃F₁₆ (M = Mn²⁺, C ...
DOI:
10.1021/jacs.9b00345

80. 3α-Hydroxymasticadienonic Acid As an Antiproliferative Agent That Impairs Mitochondrial Functions

Author:
Dalla Via Lisa; Braga Alessandra; García-Argáez Aída N.; Martínez-Vázquez Mariano; Toninello Antonio
Source:
Journal of natural products 2012 v.75 no.4 pp. 557-562
ISSN:
1520-6025
Subject:
adenosine triphosphate; apoptosis; calcium; cations; cell viability; cytotoxicity; death; dose response; liver; membrane permeability; mitochondria; oxidative stress; rats
Abstract:
... Previous investigations on the biological effects of 3α-hydroxymasticadienonic acid (1) have demonstrated both anti-inflammatory and cytotoxic activities. However, neither the molecular mechanism of cytotoxic action nor the possible intracellular target(s) have been reported so far for this compound. The crucial role played by mitochondria on both cell survival and death, due to production of ATP ...
DOI:
10.1021/np200607b

81. 3β-O-Glycosylated 16β-acetoxy-9β-H-lanosta-7,24-diene-3β,18,20β-triol, an intermediate metabolite from the sea cucumber Eupentacta fraudatrix and its biosynthetic significance

Author:
Alexandra S. Silchenko; Anatoly I. Kalinovsky; Sergey A. Avilov; Pelageya V. Andryjashchenko; Pavel S. Dmitrenok; Vladimir I. Kalinin; Valentin A. Stonik
Source:
Biochemical systematics and ecology 2012 v.44 no. pp. 53-60
ISSN:
0305-1978
Subject:
biosynthesis; cations; biochemical pathways; glycosides; Holothuroidea
Abstract:
... A novel oligoglycoside cucumarioside A₈ with unprecedented hydroxy group at C-18 was isolated from sea cucumber Eupentacta fraudatrix and its structure elucidated. The presence of hydroxy group at C-18 indicates that the glycoside is a “hot” metabolite that allows clarification of some peculiarities of 4,4,14-trimethylsterol glycoside biosynthetic pathways. A hypothetical scheme of biosynthesis of ...
DOI:
10.1016/j.bse.2012.04.008

82. 4,5-Dihaloimidazolium-based ionic liquids: effects of halogen-bonding on crystal structures and ionic conductivity

Author:
Tomohiro Mukai; Keiko Nishikawa
Source:
RSC advances 2013 v.3 no.43 pp. 19952-19955
ISSN:
2046-2069
Subject:
anions; cations; crystal structure; halogens; imidazoles; ionic liquids
Abstract:
... Halogen substitutions at the 4- and 5-positions of the imidazolium cation cause characteristic molecular arrangements in the crystal phase and increase the number of ion pairs in the liquid phase because of halogen-bonding between the halide groups and the counter anions. ...
DOI:
10.1039/c3ra43899f

83. 4,5-Dioxo-imidazolinium Cation Activation of 1-Acyl-1-carbamoyl Oximes: Access to Cyanoformamides Using Dichloroimidazolidinedione

Author:
Yu Gao; Zhihao Zhang; Zhenjiang Li; Tianfo Guo; Yuejia Zhu; Zhiwei Yao; Bo Liu; Yongqiang Li; Kai Guo
Source:
Journal of organic chemistry 2019 v.85 no.2 pp. 1087-1096
ISSN:
1520-6904
Subject:
bioactive compounds; cations; chemical bonding; chemical reactions; cleavage (chemistry); moieties; organic chemistry; oximes
Abstract:
... Cyanoformamides are prevalent as versatile building blocks for accessing synthetically useful intermediates and biologically active compounds. The development of a milder, simpler, and more efficient approach to cyanoformamides is nontrivial. Herein, we demonstrate the effectiveness of 4,5-dioxo-imidazolinium cation activation for transforming 1-acyl-1-carbamoyl oximes to cyanoformamides. By makin ...
DOI:
10.1021/acs.joc.9b02992

84. 4,5-Dioxo-imidazolinium Cation-Promoted α-Selective Dehydrative Glycosylation of 2-Deoxy- and 2,6-Dideoxy Sugars

Author:
Javed; Ashwani Tiwari; Zanjila Azeem; Pintu Kumar Mandal
Source:
Journal of organic chemistry 2022 v.87 no.5 pp. 3718-3729
ISSN:
1520-6904
Subject:
cations; glycosylation; organic chemistry; stereoselectivity
Abstract:
... Herein, we report the great potential of the 4,5-dioxo-imidazolinium cation activation strategy for dehydrative glycosylation reactions employing the readily available and economical geminal dichloroimidazolidinediones (DCIDs) that promotes the glycosylation between 2-deoxy- and 2,6-dideoxy-sugar hemiacetals with various acceptors in good yields and high α-selectivity. This research not only provi ...
DOI:
10.1021/acs.joc.1c02650

85. 4- and 5-Coordinate Dinuclear Copper(II) Complexes with the Tetraacetylethanediide and an N-Alkylated Diamine or a Triamine

Author:
Hide Kambayashi; Junko Yuzurihara; Yuichi Masuda; Hiroko Nakagawa; Wolfgang Linert; Yutaka Fukuda
Source:
Zeitschrift für Naturforschung B 2014 v.50 no.4 pp. 536-544
ISSN:
1865-7117
Subject:
ambient temperature; cations; chlorides; copper; crystal structure; ethylene dichloride; geometry; moieties; nitrates; perchlorates; polyamines; solvents
Abstract:
... Six dinuclear copper(II) complexes have been prepared, Cu₂(taet)(plam)₂X₂ where taet = 1,1,2,2-tetraacetylethanediide, plam = N-alkylated polyamine such as tmen = N,N,N′,N′-tetramethylethylenediamine or pmdt = N,N,N′,N′,N′-pentamethyldiethylenetriamine, X = a monovalent anion such as ClO₄⁻ , NO₃⁻ or Cl⁻. These complexes are classified into two categories from the results of electronic spectra, IR ...
DOI:
10.1515/znb-1995-0411

86. 4-(Aminoethyl)pyridine as a Bifunctional Spacer Cation for Efficient and Stable 2D Ruddlesden–Popper Perovskite Solar Cells

Author:
Yaru Li; Haoliang Cheng; Ke Zhao; Zhong-Sheng Wang
Source:
ACS applied materials & interfaces 2019 v.11 no.41 pp. 37804-37811
ISSN:
1944-8252
Subject:
amines; cations; crystallization; lead; nitrogen; pyridines; solar cells
Abstract:
... Two-dimensional (2D) Ruddlesden–Popper (RP) perovskites are attractive due to their appealing environmental stability. We demonstrate herein a spacer cation, 4-(aminoethyl)pyridine (4-AEP), for preparation of 2D RP perovskite films. The 4-AEP can not only act as a spacer cation but also coordinate with the Pb²⁺ ions in PbI₂ with the nitrogen atom on the pyridine ring. High-quality 2D RP perovskite ...
DOI:
10.1021/acsami.9b13951

87. 4-Oxo- or 1-oxo-N₇O⁺? A computational and experimental study

Author:
Tao Yu; Ying-Zhe Liu; Ralf Haiges; Karl O. Christe; Wei-Peng Lai; Bo Wu
Source:
RSC advances 2014 v.4 no.54 pp. 28377-28389
ISSN:
2046-2069
Subject:
cations; dissociation; energy; intermediate product; isomerization; isotope labeling; nitrogen; nitrous oxide; stable isotopes; synthesis
Abstract:
... In a previous paper [Inorg. Chem., 2010, 49, 1245], we studied the reaction of F₂NO⁺ with an excess of HN₃ which led to the quantitative formation of N₅⁺ and N₂O. Based on ¹⁵N-labeling experiments and theoretical calculations, the formation of a 4-oxo-N₇O⁺ intermediate with a decomposition energy barrier of about 40 kcal mol⁻¹ was proposed. Since this relatively high barrier disagreed with our fai ...
DOI:
10.1039/c4ra02140a

88. 4-tert-butylcalix[4]arene having nitrile pendant groups as Hg²⁺ selective receptors

Author:
Begum Tabakci; Onder Alici; Ibrahim Karatas
Source:
Talanta 2013 v.106 no. pp. 92-96
ISSN:
0039-9140
Subject:
cadmium; cations; cobalt; copper; heavy metals; mercury; nickel; nitriles; nuclear magnetic resonance spectroscopy; solvents; zinc
Abstract:
... We synthesized a series of 4-tert-butylcalix[4]arene nitriles (5–7) by the reaction of 4-tert-butylcalix[4]arene (1) with 4′-(6-bromohexyloxy)biphenyl-4-carbonitrile (2), 4′-(10-bromode-cyloxy)biphenyl-4-carbonitrile (3), and 4′-(12-bromododecyloxy)biphenyl-4-carbonitrile (4) and characterized their structures, respectively. The extraction abilities of newly synthesized 5–7 toward some selected he ...
DOI:
10.1016/j.talanta.2012.12.021

89. A 47-year high resolution chemistry record of atmospheric environment change from the Laohugou Glacier No. 12, north slope of Qilian Mountains, China

Author:
Zhiwen Dong; Xiang Qin; Jiawen Ren; Dahe Qin; Xiaoqing Cui; Jizu Chen
Source:
Quaternary international 2013 v.313-314 no. pp. 137-146
ISSN:
1040-6182
Subject:
North Atlantic Oscillation; aerosols; air temperature; altitude; anions; atmospheric circulation; calcium; cations; chlorides; deserts; dust storms; glaciers; ice; isotopes; magnesium; mountains; oxygen; potassium; sodium; time series analysis; topographic slope; wind speed; China
Abstract:
... Based on a 20.12 m shallow ice core drilled at the Laohugou Glacier No. 12 (39°25.7′N, 96°33.4′E, 5040 m a.s.l.), north slope of Qilian Mountains in the northeastern Qinghai–Tibetan Plateau in June 2006, the changes of atmospheric environment over the Qilian Mountains and northwestern China recorded by ice chemistry and its possible connection with atmospheric circulation and the winter North Atla ...
DOI:
10.1016/j.quaint.2013.09.033

90. 5,5′-Bis-vanillin derivatives as discriminating sensors for trivalent cations

Author:
Ana M. Costero; Salvador Gil; Margarita Parra; Pedro M.E. Mancini; María N. Kneeteman; Matías I. Quindt
Source:
Tetrahedron letters 2015 v.56 no.26 pp. 3988-3991
ISSN:
0040-4039
Subject:
aluminum; cations; chemical reactions; chromium; iron; ligands; moieties; organic compounds
Abstract:
... Several bis-vanillin derivatives containing semicarbazone moieties have been prepared and used in discriminating trivalent cations. The prepared probes are readily obtained and they are usually highly crystalline. Depending on the ligand and the studied cations, quenching, enhancement or no changes in the fluorescence spectrum were observed. Using a series of the prepared ligands allows distinguis ...
DOI:
10.1016/j.tetlet.2015.04.120

91. 5-(Dinitromethyl)-3-(trinitromethyl)-1,2,4-triazole and its derivatives: a new application of oxidative nitration towards gem-trinitro-based energetic materials

Author:
Srinivas Dharavath; Jiaheng Zhang; Gregory H. Imler; Damon A. Parrish; Jean'ne M. Shreeve
Source:
Journal of materials chemistry A 2017 v.5 no.10 pp. 4785-4790
ISSN:
2050-7496
Subject:
X-radiation; anions; cations; moieties; stabilizers; triazoles
Abstract:
... An excellent method for the preparation of gem-trinitro compounds is destructive nitration based on an active methylene moiety with a neighboring carbonyl structure. Now described is an alternative approach where oxidative nitration was utilized to synthesize gem-trinitro compounds. Using this strategy, 5-(dinitromethyl)-3-(trinitromethyl)-1,2,4-triazole (6) and its ionic derivatives (7–12) were d ...
DOI:
10.1039/c7ta00730b

92. 5-Hydroxymethylfurfural accumulation plays a critical role on acrylamide formation in coffee during roasting as confirmed by multiresponse kinetic modelling

Author:
Aytül Hamzalıoğlu; Vural Gökmen
Source:
Food chemistry 2020 v.318 pp. 126467
ISSN:
0308-8146
Subject:
acrylamides; asparagine; cations; free amino acids; glucose; hydroxymethylfurfural; kinetics; reducing sugars; roasting; sucrose
Abstract:
... This study aims to investigate in depth the mechanism of acrylamide formation in coffee during roasting. For this purpose, a comprehensive kinetic model including the elementary steps for acrylamide formation was proposed. The changes in sucrose, reducing sugars, free amino acids, asparagine, acrylamide, 3-deoxyglucosone, methylglyoxal, glyoxal, and 5-hydroxymethylfurfural were monitored in coffee ...
DOI:
10.1016/j.foodchem.2020.126467

93. 5-Thiaporphyrinium cation: effect of sulphur incorporation on excited state dynamics

Author:
Asahi Takiguchi; Naoto Inai; Seongsoo Kang; Masaya Hagai; Seokwon Lee; Takeshi Yanai; Dongho Kim; Hiroshi Shinokubo
Source:
Chemical communications 2022 v.58 no.40 pp. 5956-5959
ISSN:
1364-548X
Subject:
cations; fluorescence; sulfur; zinc
Abstract:
... We synthesised thionium-ion embedded aromatic porphyrinoids: a free-base 5-thiaporphyrinium cation and its zinc complex. The sulphur atom effectively participates in the macrocyclic π-conjugation. Fluorescence quantum yields of thiaporphyrinium cations were lower than 1% unlike oxaporphyrinium cations. Detailed photophysical analysis and DFT calculations clarified the vibrational mode regarding th ...
DOI:
10.1039/d2cc00522k

94. 5000 years of lacustrine ecosystem changes from Lake Petit (Southern Alps, 2200 m a.s.l.): Regime shift and resilience of algal communities

Author:
Rosine Cartier; Elodie Brisset; Christine Paillès; Frédéric Guiter; Florence Sylvestre; Florence Ruaudel; Edward J Anthony; Cécile Miramont
Source:
Holocene v.25 no.8 pp. 1231-1245
ISSN:
1477-0911
Subject:
Bacillariophyceae; Pediastrum; Podzols; acidification; algae; altitude; aquatic ecosystems; cations; climate; conifers; grasslands; humans; lakes; landscapes; limnology; nutrients; organic carbon; paleoecology; paleontology; sediments; surface water; total nitrogen; watersheds; weathering; woodlands
Abstract:
... Sediments from Lake Petit (2200 m a.s.l., Southern Alps) are particularly relevant for analysis of coupled landscape palaeoecology and palaeolimnology. Diatom assemblages, organic matter composition of sediments (total nitrogen and organic carbon) and Pediastrum boryanum concentrations were obtained from a 144-cm-long core, enabling the reconstruction of the aquatic ecosystem over nearly the last ...
DOI:
10.1177/0959683615580862

95. The 50kDa metalloproteinase TvMP50 is a zinc-mediated Trichomonas vaginalis virulence factor

Author:
Jonathan Puente-Rivera; José Luis Villalpando; Alma Villalobos-Osnaya; Laura Isabel Vázquez-Carrillo; Gloria León-Ávila; María Dolores Ponce-Regalado; César López-Camarillo; Jose Miguel Elizalde-Contreras; Eliel Ruiz-May; Rossana Arroyo; María Elizbeth Alvarez-Sánchez
Source:
Molecular and biochemical parasitology 2017 v.217 pp. 32-41
ISSN:
0166-6851
Subject:
EDTA (chelating agent); Trichomonas vaginalis; aminopeptidases; cations; cytoplasm; cytotoxicity; ethylene glycol tetraacetic acid; fluorescent antibody technique; gene expression; males; parasites; polyclonal antibodies; proteinases; proteolysis; reverse transcriptase polymerase chain reaction; secretion; trichomoniasis; virulence; zinc
Abstract:
... Trichomonas vaginalis is a protozoan parasite that can adapt to the trichomonicidal Zn2+ concentrations of the male urogenital tract microenvironment. This adaptation is mediated by molecular mechanisms, including proteinase expression, that are regulated by cations such as Zn2+. Herein, we characterized the previously identified 50kDa metalloproteinase aminopeptidase P (M24 family) member TvMP50 ...
DOI:
10.1016/j.molbiopara.2017.09.001

96. 600 nm Irradiation-Induced Efficient Photocatalytic CO₂ Reduction by Ultrathin Layered Double Hydroxide Nanosheets

Author:
Sha Bai; Zelin Wang; Ling Tan; Geoffrey I. N. Waterhouse; Yufei Zhao; Yu-Fei Song
Source:
Industrial & engineering chemistry process design and development 2020 v.59 no.13 pp. 5848-5857
ISSN:
1520-5045
Subject:
carbon dioxide; carbon monoxide; cations; cobalt; electrons; fuels; irradiation; light; magnesium; nanosheets; nickel; photocatalysis; photocatalysts; photosensitizing agents; process design; ruthenium; zinc
Abstract:
... Currently, developing effective photocatalysts for reducing CO₂ to commercial chemicals and fuels has aroused great interest. However, rates of photocatalytic CO₂ reduction remain too low to arouse interest. Herein, we successfully synthesized four different ultrathin MAl-layered double hydroxide (u-MAl-LDH) photocatalysts (where M = Mg²⁺, Co²⁺, Ni²⁺, and Zn²⁺), each possessing a different number ...
DOI:
10.1021/acs.iecr.0c00522

97. A 67-kDa plasma-membrane-bound Ca2+-stimulated protein kinase active in sink tissue of higher plants

Author:
Barker, L.D.P.; Templeton, M.D.; Ferguson, I.B.
Source:
Planta 1998 v.205 no.2 pp. 197-204
ISSN:
0032-0935
Subject:
Malus domestica; Zea mays; molecular weight; microsomes; cell suspension culture; chemical structure; magnesium; cations; enzyme activity; cytochemistry; Pyrus communis; leaves; roots; source-sink relationships; amino acids; light; coleoptiles; inorganic ions; calcium; plasma membrane; etiolation
Abstract:
... A novel 67-kDa protein kinase (p67(cdpk)) was identified in the microsomal membrane fraction of apple (Malus domestica Borkh. cv. Braeburn) suspension cultures and subsequently found to be active in sink tissues. Microsomal proteins were blotted onto Nylon or polyvinylidenedifluoride membranes, and p67(cdpk) assayed by in situ-labelling renatured proteins with [gamma-32P]ATP; thin-layer electropho ...
DOI:
10.1007/s004250050312

98. Das 7,8-Benzo-5-chloro-1,4,4-trimethyl-1-aza-4-azonia-6,9-dioxa-5 λ5-phosphaspiro[4.4]nonanyl-Kation: Röntgenstrukturanalyse und temperaturabhängige 1H-NMR-Spektren: The 7, 8-Benzo-5-chloro-1,4,4-trimethyl-1-aza-4-azonia-6,9-dioxa-5 λ).5-phosphaspiro[4.4]nonanyl Cation: X-Ray Crystal Structure Determination and Variable 1H NMR Spectra

Author:
Thomas Kaukorat; Peter G. Jones; Reinhard Schmutzler
Source:
Zeitschrift für Naturforschung 2014 v.47 no.6 pp. 755-759
ISSN:
0932-0776
Subject:
Gibbs free energy; ambient temperature; cations; crystal structure; geometry; nitrogen; nuclear magnetic resonance spectroscopy; phosphorus; protons; sodium
Abstract:
... The ¹H NMR spectrum of the spirophosphorane 3 at room temperature indicates dynamic behaviour of the cation. The low-temperature ¹H NMR spectra of 3 exhibit two sets of doublets for the protons of the diastereotopic N(CH₃)₂ groups. The free enthalpy of activation for the dynamic process was determined (58.6 KJ/mole). In the reaction of 3 with sodium tetraphenylborate the crystalline compound, 4, i ...
DOI:
10.1515/znb-1992-0601

99. 7-Azoniafluorenonderivate durch elektrostatisch aktivierte SNAr-Reaktionen / 7-Azoniafluorenone Derivatives by Electrostatically Activated SNAr-Reactions

Author:
Robert Weiss; Frank Pühlhofer; Frank Hampel
Source:
Zeitschrift für Naturforschung 2014 v.56 no.11 pp. 1209-1216
ISSN:
0932-0776
Subject:
Lewis acids; cations; electrochemistry; fluorine; salts
Abstract:
... Various fluorosubstituted benzoylchlorides 1a-c are transformed into the corresponding acylpyridinium triflates 2a-c by one equivalent of the reagent pair 4-dimethyl-aminopyridine/ trimethylsilyltriflate (DMAP/TMSOTf). Due to the combined electrostatic and mesomeric effect of the acylpyridinium function, fluorine substituents in o- and p-positions can be subsequently substituted with a pyridinio g ...
DOI:
10.1515/znb-2001-1117

100. The 8 : 1 : 1 ternary hybrid framework in the system [EDT-TTF˙⁺][1,4-bis(iodoethynyl)benzene][Re₆Se₈(CN)₆]⁴⁻: dual noncovalent expression of the octahedral halogen-bond hexa-acceptor nanonode

Author:
Anne-Lise Barrès; Abdelkrim El-Ghayoury; Leokadiya V. Zorina; Enric Canadell; Pascale Auban-Senzier; Patrick Batail
Source:
Chemical communications 2008 v. no.19 pp. 2194-2196
ISSN:
1364-548X
Subject:
aromatic compounds; cations; chemical reactions; polymers; selenides; slabs
Abstract:
... Complementary shapes of the neutral symmetrical halogen-bond bis-donor core and octahedral inorganic cluster core prevent halogen-bonded polymers developing in more than one direction, favouring further templating by conducting radical cation slabs and yielding an 8 : 1 : 1 phase formulation instead of n : 2 : 1, with a 2D net, or m : 3 : 1, with a pseudo-cubic architecture, which may in principle ...
DOI:
10.1039/b800571k