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1. Copper-Catalyzed Radical Selenodifluoromethylation of Alkenes: Access to CF₂-Containing γ-Lactams

Author:
Sun, Kai; Wang, Songnan; Feng, Ranran; Zhang, Yixiao; Wang, Xin; Zhang, Zhiguo; Zhang, Bing
Source:
Organic letters 2019 v.21 no.7 pp. 2052-2055
ISSN:
1523-7052
Subject:
selenium,   etc   ; alkenes; chemical structure; derivatization;     Show all 4 Subjects
Abstract:
... Herein, a practical Cu-catalyzed selenodifluoromethylation protocol was developed, using readily available diselenides as the selenium source under external-oxidant-free conditions. Various structurally diverse 4-seleno-substituted α,α-difluoro-γ-lactams were obtained in moderate to excellent yields. Easy scaleup and the potential for product derivatization make this method attractive for the prep ...
DOI:
10.1021/acs.orglett.9b00240

2. MoSe₂–Cu₂S Vertical p–n Nanoheterostructures for High-Performance Photodetectors

Author:
Hassan, Md. Samim; Bera, Susnata; Gupta, Divya; Ray, Samit K.; Sapra, Sameer
Source:
ACS applied materials & interfaces 2019 v.11 no.4 pp. 4074-4083
ISSN:
1944-8252
Subject:
selenium,   etc   ; copper; molybdenum; photons; sulfides;     Show all 5 Subjects
Abstract:
... Heterostructures based on atomically thin two-dimensional layered transition metal dichalcogenides are highly promising for optoelectronic device applications owing to their tunable optical and electronic properties. However, the synthesis of heterostructures with desired materials having proper interfacial contacts has been a challenging task. Here, we develop a colloidal synthetic route for the ...
DOI:
10.1021/acsami.8b16205

3. Selenium vacancy-rich CoSe₂ ultrathin nanomeshes with abundant active sites for electrocatalytic oxygen evolution

Author:
Zhang, Yixin; Zhang, Chao; Guo, Yamei; Liu, Dali; Yu, Yifu; Zhang, Bin
Source:
Journal of materials chemistry A 2019 v.7 no.6 pp. 2536-2540
ISSN:
2050-7496
Subject:
selenium,   etc   ; active sites; electrolytes; engineering; oxygen production;     Show all 5 Subjects
Abstract:
... CoSe₂ is a promising electrocatalyst for the oxygen evolution reaction (OER), benefiting from its suitable electronic configuration and inherent metallic behavior. However, the low ratio of electrolyte-accessible active sites suppresses the OER performance of pure CoSe₂. Engineering CoSe₂ into a two-dimensional ultrathin nanomesh structure with abundant selenium vacancies is expected to increase i ...
DOI:
10.1039/c8ta11407b

4. Photoconductive properties of Er-CdSe nanobelt detectors

Author:
Huang, Jieqing; Tan, Qiuhong; Zhang, Zijing; Wang, Qianjin; Feng, Xiaobo; Liu, Yingkai
Source:
Journal of materials science 2019 v.54 no.1 pp. 560-570
ISSN:
0022-2461
Subject:
selenium,   etc   ; cadmium; detectors; erbium; nanoparticles; tungsten;     Show all 6 Subjects
Abstract:
... Three kinds of devices based on single Er-doped CdSe nanobelt (Er-CdSe NB), single CdSe NB and four CdSe NBs in parallel were constructed by hard mask assisted with 10-μm tungsten wire in diameter. The photoelectronic properties of three kinds of devices were investigated. It is found that the dark currents of Er-CdSe NB and CdSe NB (four CdSe NBs in parallel) are 4 × 10⁻¹⁰ and 1.0 × 10⁻¹³ A (8.92 ...
DOI:
10.1007/s10853-018-2845-8

5. Bioavailability of selenium in soil-plant system and a regulatory approach

Author:
Dinh, Quang Toan; Wang, Mengke; Tran, Thi Anh Thu; Zhou, Fei; Wang, Dan; Zhai, Hui; Peng, Qin; Xue, Mingyue; Du, Zekun; Bañuelos, Gary S.; Lin, Zhi-Qing; Liang, Dongli
Source:
Critical reviews in environmental science and technology 2019 v.49 no.6 pp. 443-517
ISSN:
1547-6537
Subject:
selenium; selenium fertilizers,   etc   ; agricultural wastes; bioavailability; biofortification; developmental stages; genotype; phytoremediation; soil;     Show all 9 Subjects
Abstract:
... Understanding the bioavailability of selenium (Se) in the soil–plant system plays a vital role in phytoremediation and agronomic biofortification strategies. This review aimed to (a) discuss the effect of various soil parameters on the bioavailability of Se, its uptake and translocation in relation to plant species, genotypes, growth stages, and management regimes; and (b) examine soil and plant i ...
DOI:
10.1080/10643389.2018.1550987

6. A Boradiselenirane and a Boraditellurirane: Isolable Heavy Analogs of Dioxiranes and Dithiiranes

Author:
Liu, Siyuan; Légaré, Marc-André; Hofmann, Alexander; Braunschweig, Holger
Source:
Journal of the American Chemical Society 2018 v.140 no.36 pp. 11223-11226
ISSN:
1520-5126
Subject:
selenium,   etc   ; dimerization; manganese; sulfur; tellurium;     Show all 5 Subjects
Abstract:
... The isolation of BE₂ heterocycles (E = Te, Se, S) from the reaction of a manganese borylene complex with elemental chalcogens is reported. The BTe₂ and BSe₂ cycles—a boraditellurirane and a boradiselenirane, respectively—are the first analogs of dioxiranes based on heavy chalcogens. While the BTe₂ unit is still found datively bound to manganese, the Se and S analogs were isolated in their free for ...
DOI:
10.1021/jacs.8b07829

7. Selenate removal by Fe0 coupled with ferrous iron, hydrogen peroxide, sulfidation, and weak magnetic field: A comparative study

Author:
Fan, Peng; Li, Lina; Sun, Yuankui; Qiao, Junlian; Xu, Chunhua; Guan, Xiaohong
Source:
Water research 2019 v.159 pp. 375-384
ISSN:
0043-1354
Subject:
selenium,   etc   ; hydrogen peroxide; ions; iron; magnetic fields; oxidants; pH; selenates;     Show all 8 Subjects
Abstract:
... Dosing ferrous ions (ZVI/Fe2+), combining with oxidants (e.g., H2O2) (ZVI/H2O2), sulfidation treatment (S-ZVI), and introducing a weak magnetic field (ZVI/WMF) have been widely used to enhance the performance of zerovalent iron (ZVI) for reductive removal of contaminants. Taking Se(VI) as a probe contaminant, this study systematically compared the performances of different ZVI systems (i.e., ZVI/F ...
DOI:
10.1016/j.watres.2019.05.037

8. Inhibition of angiotensin-converting enzyme by selenoneine

Author:
Seko, Takuya; Imamura, Shintaro; Ishihara, Kenji; Yamashita, Yumiko; Yamashita, Michiaki
Source:
Fisheries science 2019 v.85 no.4 pp. 731-736
ISSN:
0919-9268
Subject:
selenium,   etc   ; antioxidant activity; blood pressure; peptides; peptidyl-dipeptidase A; zinc;     Show all 6 Subjects
Abstract:
... Selenoneine is a selenium-containing compound that exhibits strong radical-scavenging activity. Here we present a novel function of selenium in which selenoneine exhibits inhibitory activity against angiotensin-converting enzyme (ACE). ACE activity was strongly inhibited by selenoneine as compared to a typical peptide that decreases blood pressure in vitro. Kinetics analysis suggested that selenon ...
DOI:
10.1007/s12562-019-01321-3

9. Direct biocatalysed synthesis of first sulfur-, selenium- and tellurium- containing l-ascorbyl hybrid derivatives with radical trapping and GPx-like properties

Author:
Tanini, Damiano; Lupori, Beatrice; Malevolti, Gianni; Ambrosi, Moira; Nostro, Pierandrea Lo; Capperucci, Antonella
Source:
Chemical communications 2019 v.55 no.40 pp. 5705-5708
ISSN:
1364-548X
Subject:
selenium,   etc   ; ascorbic acid; glutathione; sulfur; tellurium; thioesters; transesterification;     Show all 7 Subjects
Abstract:
... 6-O-l-Ascorbyl selenoesters, thioesters and telluroesters can be efficiently and directly prepared from l-ascorbic acid and suitable functionalised chalcogenoesters through lipase-catalysed transesterification reactions. Novel synthesised l-ascorbyl derivatives exhibited remarkable chain breaking and glutathione peroxidase-like activities. ...
DOI:
10.1039/c9cc02427a

10. The magnetism of 1T-MX₂ (M = Zr, Hf; X = S, Se) monolayers by hole doping

Author:
Xiang, Hui; Xu, Bo; Zhao, Weiqian; Xia, Yidong; Yin, Jiang; Zhang, Xiaofei; Liu, Zhiguo
Source:
RSC advances 2019 v.9 no.24 pp. 13561-13566
ISSN:
2046-2069
Subject:
selenium,   etc   ; ferromagnetism; fluorine; semiconductors; sulfides; sulfur; tensile strength; zirconium;     Show all 8 Subjects
Abstract:
... The magnetism of hole doped 1T-MX₂ (M = Zr, Hf; X = S, Se) monolayers is systematically studied by using first principles density functional calculations. The pristine 1T-MX₂ monolayers are semiconductors with nonmagnetic ground states, which can be transformed to ferromagnetic states by the approach of hole doping. For the unstrained monolayers, the spontaneous magnetization appears once above th ...
DOI:
10.1039/c9ra01218d

11. ABaSbQ₃ (A = Li, Na; Q = S, Se): diverse arrangement modes of isolated SbQ₃ ligands regulating the magnitudes of birefringences

Author:
AbudurusuliAilijiang Abudurusuli and Kui Wu contributed equally., Ailijiang; Wu, Kui; Tudi, Abudukadi; Yang, Zhihua; Pan, Shilie
Source:
Chemical communications 2019 v.55 no.35 pp. 5143-5146
ISSN:
1364-548X
Subject:
selenium,   etc   ; anisotropy; chemical reactions; ligands; lithium; sodium; sulfur;     Show all 7 Subjects
Abstract:
... A new series of ABaSbQ₃ compounds (A = Li, Na; Q = S, Se) featuring isolated SbQ₃ ligands with different arrangement modes was synthesized. The structural transformations (monoclinic to orthorhombic) in the known A–Mᴵᴵ–Sb–Q₃ system showing an intimate relationship with the differences (Δd = LIIM–Q − LA–Q) were systematically investigated for the first time. Remarkably, the diverse arrangement mode ...
DOI:
10.1039/c9cc00560a

12. Evaluation of benzthiazolidine-based formamidinium salts for the synthesis of penem-type β-lactams by uncatalysed carbonylation of acyclic diaminocarbenes

Author:
Jonek, Markus; Buhl, Hannes; Leibold, Michael; Bruhn, Clemens; Siemeling, Ulrich
Source:
Zeitschrift für Naturforschung 2019 v.74 no.4 pp. 365-372
ISSN:
1865-7117
Subject:
selenium,   etc   ; X-ray diffraction; beta-lactams; deprotonation; isomers;     Show all 5 Subjects
Abstract:
... The reaction of [iPr₂N=CHCl]Cl with 2-phenylbenzthiazolidine (Ph-BtzH) and subsequent anion metathesis afforded the formamidinium salt [(Ph-Btz)CH(NiPr₂)][PF₆] ([1aH][PF₆]). The reaction of [1aH][PF₆] with (Me₃Si)₂NNa in the presence of grey selenium furnished the selenourea derivative 1aSe as trapping product of the acyclic diaminocarbene 1a. In the absence of selenium, a 2H-1,4-benzothiazine der ...
DOI:
10.1515/znb-2019-0017

13. Phosphanchalkogenide und ihre Metallkomplexe. V. Derivate von [2.2]Paracyclophanylphosphanen

Author:
Upmann, Daniel; Koneczny, Marvin; Rass, Janik; Jones, Peter G.
Source:
Zeitschrift für Naturforschung 2019 v.74 no.4 pp. 389-404
ISSN:
1865-7117
Subject:
selenium,   etc   ; bromides; bromine; chlorides; gold; iodine; oxidation; sulfur;     Show all 8 Subjects
Abstract:
... The known compound diphenyl([2.2]paracyclophanyl)phosphane 1 reacted smoothly with elemental sulfur or selenium to give the phosphane chalcogenides 3 and 4. The corresponding chlorido- or bromido-gold(I) complexes were however not obtained by the usual reaction with (tht)AuCl or (tht)AuBr. For the latter, direct oxidation of the reaction mixture with elemental bromine led to small quantities of {( ...
DOI:
10.1515/znb-2019-0024

14. 7.5% n–i–p Sb₂Se₃ solar cells with CuSCN as a hole-transport layer

Author:
Li, Kanghua; Wang, Siyu; Chen, Chao; Kondrotas, Rokas; Hu, Manchen; Lu, Shuaicheng; Wang, Chong; Chen, Wei; Tang, Jiang
Source:
Journal of materials chemistry A 2019 v.7 no.16 pp. 9665-9672
ISSN:
2050-7496
Subject:
selenium,   etc   ; antimony; chemistry; copper; ions; physical properties; solar cells; thiocyanates;     Show all 8 Subjects
Abstract:
... Sb₂Se₃ is a promising non-toxic, Earth-abundant, stable thin-film solar cell absorber material. However, the low built-in potential caused by the low intrinsic doping density (∼10¹³ cm⁻³) and the low carrier collection efficiency due to the low carrier mobility (∼1.5 cm² V⁻¹ s⁻¹) hinder further efficiency improvement of Sb₂Se₃ solar cells. Therefore, an effective hole-transport layer (HTL) is nece ...
DOI:
10.1039/c9ta01773a

15. Rechargeable K-Se batteries based on metal-organic-frameworks-derived porous carbon matrix confined selenium as cathode materials

Author:
Huang, Xianglong; Xu, Qiuju; Gao, Wei; Yang, Tingting; Zhan, Renming; Deng, Jianhua; Guo, Bingshu; Tao, Mengli; Liu, Hongdong; Xu, Maowen
Source:
Journal of colloid and interface science 2019 v.539 pp. 326-331
ISSN:
0021-9797
Subject:
selenium,   etc   ; batteries; carbon; carbonation; cathodes; composite materials; coordination polymers; electrochemistry;     Show all 8 Subjects
Abstract:
... In this work, porous carbon matrix derived from metal-organic frameworks is synthesized by a facile carbonation process for confining element selenium. The Se/nitrogen-doped porous carbon composite is applied as the cathode for rechargeable K-Se batteries for the first time. The abundant and hierarchical porous structure is advantageous in overcoming the volume expansion problem caused by polysele ...
DOI:
10.1016/j.jcis.2018.12.083

16. Enhancement of Circular Dichroism of a Chiral Material by Dielectric Nanospheres

Author:
Vestler, Daniel; Ben-Moshe, Assaf; Markovich, Gil
Source:
Journal of physical chemistry 2019 v.123 no.8 pp. 5017-5022
ISSN:
1932-7455
Subject:
selenium,   etc   ; circular dichroism spectroscopy; mercury; nanocrystals; nanospheres; physical chemistry; wavelengths;     Show all 7 Subjects
Abstract:
... Circular dichroism (CD) spectroscopy is very useful for studies of biomolecular conformation but suffers from very weak signals. Several theoretical and experimental papers reported schemes for CD enhancement using enhanced local fields produced by plasmonic nanostructures. Here we report enhancement of visible wavelength CD of chiral mercury sulfide (HgS) nanocrystals by Mie resonances of amorpho ...
DOI:
10.1021/acs.jpcc.8b10975

17. Electrochemical Radical Selenylation/1,2-Carbon Migration and Dowd–Beckwith-Type Ring-Expansion Sequences of Alkenylcyclobutanols

Author:
Kim, Yeon Joo; Kim, Dae Young
Source:
Organic letters 2019 v.21 no.4 pp. 1021-1025
ISSN:
1523-7052
Subject:
selenium,   etc   ; chemical reactions; chemical structure; electrochemistry; electrons; ketones; protocols;     Show all 7 Subjects
Abstract:
... Electrochemical oxidative radical selenylation/1,2-carbon migration and Dowd–Beckwith-type ring-expansion sequences of alkenylcyclobutanols were developed in this study. This approach is environmentally benign and uses shelf-stable diselenides as selenium radical precursors and electrons as oxidizing reagents. The present protocol offers a facile way to prepare β-selenated cyclic ketone derivative ...
DOI:
10.1021/acs.orglett.8b04041

18. Long-term effectiveness of sediment dredging on controlling the contamination of arsenic, selenium, and antimony

Author:
Sun, Qin; Ding, Shiming; Chen, Musong; Gao, Shuaishuai; Lu, Guanghua; Wu, Yuexia; Gong, Mengdan; Wang, Dan; Wang, Yan
Source:
Environmental pollution 2019 v.245 pp. 725-734
ISSN:
0269-7491
Subject:
selenium,   etc   ; algae; antimony; arsenic; dialysis; sediment contamination; sediments;     Show all 7 Subjects
Abstract:
... This study assessed the effectiveness of dredging in controlling arsenic (As), selenium (Se), and antimony (Sb) contamination in sediments, by examining contaminant concentrations in sediments six years after dredging was completed. High-resolution diffusive gradients in thin films (DGT) and dialysis (HR-Peeper) techniques were used to monitor the concentrations of DGT-labile metalloids and solubl ...
DOI:
10.1016/j.envpol.2018.11.050

19. Plant selenium toxicity: Proteome in the crosshairs

Author:
Kolbert, Z.; Molnár, Á.; Feigl, G.; Van Hoewyk, D.
Source:
Journal of plant physiology 2019 v.232 pp. 291-300
ISSN:
0176-1617
Subject:
selenium,   etc   ; metalloids; phytotoxicity; protein synthesis; proteome; proteomics; selenocysteine; selenoproteins; sulfur;     Show all 9 Subjects
Abstract:
... The metalloid element, selenium (Se) is in many ways special and perhaps because of this its research in human and plant systems is of great interest. Despite its non-essentiality, higher plants take it up and metabolize it via sulfur pathways, but higher amounts of Se cause toxic symptoms in plants. However, the molecular mechanisms of selenium phytotoxicity have been only partly revealed; the da ...
DOI:
10.1016/j.jplph.2018.11.003

20. Uptake and remobilization of selenium in Brassica napus L. plants supplied with selenate or selenium‐enriched plant residues

Author:
Ebrahimi, Nashmin; Hartikainen, Helinä; Hajiboland, Roghieh; Seppänen, Mervi M.
Source:
Zeitschrift für Pflanzenernährung und Bodenkunde 2019 v.182 no.2 pp. 196-202
ISSN:
1436-8730
Subject:
selenium; selenium fertilizers,   etc   ; Brassica napus; autoclaving; bioavailability; biofortification; breeding; crop residues; crops; fruits; leaves; microbial activity; seeds; selenates; soil;     Show all 15 Subjects
Abstract:
... Selenium (Se) biofortification via crops is one of the best strategies to elevate the daily Se intake in areas where soil Se levels are low. However, Se fertilizer recovery (SeFR) is low and most of the Se taken up accumulates in non‐harvested plant parts and returns to the soil with plant residues. A pot experiment with soil was undertaken to study the efficiency of inorganic Se (Na₂SeO₄) and Se‐ ...
DOI:
10.1002/jpln.201700316