A novel polymeric Cd[SSe2N2] central core five-coordinate complex: Synthesis, X-ray structure and 113Cd, 77Se CP MAS NMR characterization of catena(bis(μ2-selenocyanato-N,Se)-(N,N′-dimethylimidazolidine- 2-thione-S)-cadmium(II))
TL;DR: In this paper, the 77Se CP MAS NMR data are consistent with two different selenium sites and the shielding tensor parameters of 113Cd point to a near axial symmetry for the cadmium environment.
About: This article is published in Inorganic Chemistry Communications.The article was published on 2008-03-01. It has received 17 citations till now. The article focuses on the topics: Trigonal bipyramidal molecular geometry & Coordination sphere.
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TL;DR: The availability of a large number of novel NHC adducts has not only produced new varieties of already existing ligand classes but has also allowed establishment of numerous complexes with unusual and often unprecedented element-metal bonds.
Abstract: N-Heterocyclic carbenes (NHC) are nowadays ubiquitous and indispensable in many research fields, and it is not possible to imagine modern transition metal and main group element chemistry without t...
288 citations
40 citations
TL;DR: Cadmium(II) complexes were also characterized by IR and NMR spectroscopy and the data are consistent with the structures of the compounds as mentioned in this paper. But they have no crystallographic symmetry.
Abstract: Cadmium(II) complexes, dibromidobis(N,N′-dimethylthiourea-S)cadmium(II), [Cd(Dmtu)2Br2] (1) and diiodidobis(N,N′-dimethylthiourea-S)cadmium(II), [Cd(Dmtu)2I2] (2), have been prepared and their structures have been determined by X-ray crystal structure analysis. Compound 1 crystallized in the monoclinic space group C2/c, and the metal ion is situated on a twofold rotation axis. Compound 2 also crystallized in a monoclinic space group, P21/c, but here the molecules have no crystallographic symmetry. In both compounds the cadmium atom is bonded to two halide ions and to two dimethylthiourea molecules through the sulfur atoms in a tetrahedral environment. The molecules are linked via N–H⋯Halide hydrogen bonds to form infinite one-dimensional chains in 1 and infinite two dimensional networks in 2. The complexes were also characterized by IR and NMR spectroscopy and the data are consistent with the structures of the compounds. Cadmium(II) complexes, dibromidobis(N,N′-dimethylthiourea-S)cadmium(II), [Cd(Dmtu)2Br2] (1) and diiodidobis(N,N′-dimethylthiourea-S)cadmium(II), [Cd(Dmtu)2I2] (2), have been prepared and their structures have been determined by X-ray crystal structure analysis. In both compounds the cadmium atom is bonded to two halide ions and to two dimethylthiourea molecules through the sulfur atoms in a tetrahedral environment. The molecules are linked via N–H⋯Halide hydrogen bonds to form infinite one-dimensional chains in 1 and infinite two dimensional networks in 2. The complexes were also characterized by IR and NMR spectroscopy and the data are consistent with the structures of the compounds.
16 citations
TL;DR: Coordination polymers [CdCl(NCS)L]n (1) and {[Cd2I4(L)2]·H2O·DMF}n (2) were synthesized and structurally characterized as mentioned in this paper.
16 citations
TL;DR: In this article, a cadmium(II) complex, called dichloridobis(N,N’-dimethylthiourea-S)cadmium (II), [Cd(Dmtu)2Cl2] (1), was prepared and its structure was determined by X-ray crystal structure analysis.
Abstract: A cadmium(II) complex, dichloridobis(N,N’-dimethylthiourea-S)cadmium(II), [Cd(Dmtu)2Cl2] (1), was prepared and its structure was determined by X-ray crystal structure analysis. The cadmium(II) ion is four-coordinated and the complex has a distorted tetrahedral geometry. The bond angles are in the range of 108.18(3)–110.45(2)°. The metal ion is bonded to two chloride ions and two dimethylthiourea molecules through the sulfur atoms. The crystal structure shows both intra- and intermolecular hydrogen bonds. The new complex was also characterized by IR and NMR spectroscopy and the spectroscopic data are discussed in terms of the nature of bonding.
14 citations
References
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01 Jan 1996
3,515 citations
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01 Jan 1996
TL;DR: Encyclopedia of nuclear magnetic resonance, Encyclopedia of Nuclear Magnetic Resonance (ENM) as discussed by the authors, is an encyclopedia of nuclear magnetism and magnetic resonance (EMR) research.
Abstract: Encyclopedia of nuclear magnetic resonance , Encyclopedia of nuclear magnetic resonance , کتابخانه دیجیتال جندی شاپور اهواز
1,379 citations
TL;DR: Heterocyclic thioamides usually occurring in their thioketo form are referred to as thiones and their corresponding anions as ‘thionates’.
263 citations
TL;DR: Selenium compounds are likely targets for zinc/thiolate coordination centers in vivo, because the reactions are only partially suppressed by excess glutathione, and their specificity and the potential to undergo catalytic reactions at low concentrations suggests that zinc release is a significant aspect of the therapeutic antioxidant actions of selenium compounds in antiinflammatory and anticarcinogenic agents.
Abstract: Selenium has been increasingly recognized as an essential element in biology and medicine. Its biochemistry resembles that of sulfur, yet differs from it by virtue of both redox potentials and stabilities of its oxidation states. Selenium can substitute for the more ubiquitous sulfur of cysteine and as such plays an important role in more than a dozen selenoproteins. We have chosen to examine zinc–sulfur centers as possible targets of selenium redox biochemistry. Selenium compounds release zinc from zinc/thiolate-coordination environments, thereby affecting the cellular thiol redox state and the distribution of zinc and likely of other metal ions. Aromatic selenium compounds are excellent spectroscopic probes of the otherwise relatively unstable functional selenium groups. Zinc-coordinated thiolates, e.g., metallothionein (MT), and uncoordinated thiolates, e.g., glutathione, react with benzeneseleninic acid (oxidation state +2), benzeneselenenyl chloride (oxidation state 0) and selenocystamine (oxidation state −1). Benzeneseleninic acid and benzeneselenenyl chloride react very rapidly with MT and titrate substoichiometrically and with a 1:1 stoichiometry, respectively. Selenium compounds also catalyze the release of zinc from MT in peroxidation and thiol/disulfide-interchange reactions. The selenoenzyme glutathione peroxidase catalytically oxidizes MT and releases zinc in the presence of t-butyl hydroperoxide, suggesting that this type of redox chemistry may be employed in biology for the control of metal metabolism. Moreover, selenium compounds are likely targets for zinc/thiolate coordination centers in vivo, because the reactions are only partially suppressed by excess glutathione. This specificity and the potential to undergo catalytic reactions at low concentrations suggests that zinc release is a significant aspect of the therapeutic antioxidant actions of selenium compounds in antiinflammatory and anticarcinogenic agents.
126 citations
TL;DR: Feng et al. as mentioned in this paper, PY (通讯作者), Univ Calif Riverside, Dept Chem, Riverside, CA 92521 USA այ子邮件地址: pingyun.feng.
Abstract: 通讯作者地址: Feng, PY (通讯作者), Univ Calif Riverside, Dept Chem, Riverside, CA 92521 USA
地址:
1. Univ Calif Riverside, Dept Chem, Riverside, CA 92521 USA
2. Calif State Univ Long Beach, Dept Chem & Biochem, Long Beach, CA 90840 USA
电子邮件地址: pingyun.feng@ucr.edu
69 citations