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• W2029528155 abstract "Abstract Tellurium, but not selenium, reacts with phenacyl bromide (ω-bromoacetophenone) to give diphenacyltellurium dibromide (PhCOCH2)2TeBr2 (1), which represents the first example of a functionally substituted organotellurium halide to have been prepared directly from elemental tellurium and an organic halide. Metathesis of 1 with KI affords the crystalline diiodide, (PhCOCH2)2TeI2 (2), but halide–pseudohalide exchange does not proceed with KSCN or AgN3. Compounds 1 and 2 have been characterized by elemental analyses, IR, 1H- and 13C-NMR and mass spectrometry. Coordinative interaction of both the carbonyl groups in 1 and 2, in solid state as well as in solution, is indicated by IR spectra. Crystal and molecular structures of the dihalides were determined by X-ray diffraction method. Compounds 1 and 2 are isostructural and crystallize in the monoclinic system with space group P21/n. The primary geometry about the central Te atom in both the compounds is Ψ-trigonal-bipyramidal with axial halogens. Stereochemically active lone pair of electrons occupies the equatorial plane along with methylene C atoms of the organic ligands. The Te⋯O intramolecular attractive interactions, though weak [Te⋯O(1), Te⋯O(2): 2.938, 2.912 A in 1 and 2.877, 2.818 A in 2] appear to saturate tellurium(IV) atom coordinatively so as to prevent intermolecular Te⋯Br/I interactions. However, there is evidence of weak intermolecular TeBr⋯H(methylene) secondary interactions in compound 1, leading to the formation of supramolecular assemblies." @default.
• W2029528155 created "2016-06-24" @default.
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• W2029528155 date "2002-09-01" @default.
• W2029528155 modified "2023-09-27" @default.
• W2029528155 title "Synthesis and characterization of monomeric diorganotellurium dihalides: crystal and molecular structures of diphenacyltellurium dibromide and -diiodide" @default.
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• W2029528155 doi "https://doi.org/10.1016/s0022-328x(02)01648-0" @default.
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