Complexation of tellurium(II) with thioglycolic acid and reactivity patterns of the system
TL;DR: In this paper, the authors showed that the presence of halides did not stabilise but actually destabilised the Te(II)-TGA system, the effect being I ⪢ Br ⫢ Cl. The results have been rationalised on the basis of the instability of the TGA-H 2 species with respect to an internal redox reaction.
About: This article is published in Journal of Inorganic and Nuclear Chemistry.The article was published on 1973-09-01. It has received 7 citations till now. The article focuses on the topics: Thioglycolic acid.
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TL;DR: In this article, the characterisation and crystal structure of tetrakis(phenylenethiourea)tellurium(II) chloride dihydrochloride is reported.
5 citations
TL;DR: In this article, the polarographic behavior of tellurium complexes with mercaptocarboxylic acids in 0.5 M H 2 SO 4 was studied, and the stability constants of 2-MPA, 3-mPA, MAA, TMA and cysteine were determined by the Schwarzenbach method.
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TL;DR: In this article, the trans bond-lengthening effects of ligands in linear three-center systems of the sixth main group of the Periodic Table have been investigated and the transition state in nucleophilic substitutions at divalent sulphur, selenium and tellurium is discussed.
Abstract: Linear three-centre systems of sixth-group atoms occur in the triselenocyanate ion and in a series of tellurium(ii) complexes. In the triselenocyanate ion, the Se—Se bonds are about 032 A longer than covalent single bonds. In centrosymmetric square-planar tellurium(n) complexes, the tellurium—ligand bonds are about 027 A longer than covalent single bonds. In tellurium(ii) complexes where the linear three-centre systems are not symmetrical, pronounced relative trans bond-lengthening effects of ligands are observed. The phenyl group has a particularly large trans bond-lengthening effect. The transition state in nucleophilic substitutions at divalent sulphur, selenium and tellurium is discussed. CHEMICAL bonds longer and weaker than covalent single bonds are known in various classes of compounds. Such bonds occur, for example, in the trihalide ions of the seventh Main Group of the Periodic Table. This article is concerned with similar aspects in the sixth Main Group; specifically, with linear three-atom systems centred on divalent selenium and tellurium, and also on divalent sulphur. Halogens add a halide ion to give linear trihalide ions. In the iodine molecule, in the gas phase, the iodine—iodine bond length1 is 267 A. In the triiodide ion, in the symmetrical case, the iodine—iodine bonds are 29O—293 A24, that is, &23—036 A longer than in molecular iodine. In the bromine molecule, the bromine—bromine bond length1 is 228 A; in the tribromide ion, in the symmetrical case, the bromine—bromine bonds are 254—255 A5 6, or 026—O27 A longer than in molecular bromine. Halogens and interhalogens also form linear adducts with electroneutral n donors like amines, suiphides and selenides7 In two iodine adducts where nitrogen is donor atom'° 12, the iodine—iodine bond is 2'83 A; in two adducts where sulphur is donor atom13 15 the iodine—iodine bond is 282 and 279 A; and in three adducts where selenium is donor atom 1618 the iodine—iodine bond is 287, 291 and 296 A. Thus, not only in the triiodide ion, the adduct of the halogen with its anion, but also in adducts with electroneutral n donors, the iodine—iodine bond is lengthened relative to molecular iodine.
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