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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/14264

Title: Isolation and Structural Characterization of Some Aryltellurium Halides and Their Hydrolyzed Products Stabilized by an Intramolecular Te center dot center dot center dot N Interaction
Authors: SRIVASTAVA, K
SHAH, P
SINGH, HB
BUTCHER, RJ
Keywords: O APICAL LINKAGES
MOLECULAR-STRUCTURE
CRYSTAL-STRUCTURE
ORGANOTELLURIUM COMPOUNDS
ORGANOSELENIUM COMPOUNDS
TELLURIUM TETRACHLORIDE
SUBSTITUTION-REACTIONS
NMR-SPECTROSCOPY
TRANSFER REAGENT
DERIVATIVES
Issue Date: 2011
Publisher: AMER CHEMICAL SOC
Citation: ORGANOMETALLICS,30(3)534-546
Abstract: The isolation of pure [2-(phenylazo)phenyl-C,N']tellurium(IV) tribromide (6) has been achieved by modifying the reported procedure, which involved transmetalation of [2-(phenylazo)phenyl-C, N']mercury(II) chloride (7) with TeBr(4). The mixed-valent derivative bis[2-(phenylazo)phenyl-C, N']ditellurium dichloride (19), incorporating both a divalent and a tetravalent tellurium, was obtained serendipitously during the reduction of [2-(phenylazo)phenyl-C,N']tellurium(IV) trichloride (16) with hydrazine hydrate. Bis[2-(phenylazo)phenyl-C,N']telluride (10) has been synthesized by the ortho-lithiation route. Telluride 10, on treatment with SO(2)Cl(2) and Br(2), underwent oxidative addition to give the expected Te(IV) halogenated products bis[2-(phenylazo)phenyl-C,N']tellurium(IV) dichloride (13) and bis[2-(phenylazo)phenyl-C,N']tellurium(IV) dibromide (11), respectively. However, a similar reaction of 10 with 12 resulted in the formation of an unexpected telluronium cation, iodobis[2-(phenylazo)phenyl-C,N']telluronium triiodide (14), and [2-(phenylazo)phenyl-C,N']tellurenenyl(II) iodide (12). Alkaline hydrolysis of 16 under reflux conditions resulted in the formation of monomeric [2-(phenylazo)phenyl-C,N']tellurinic acid (20) and its sodium salt (21) as a cocrystal. Bis[[2-(phenylazo)phenyl-C,N']tellurium]-oxide (22) was obtained from the hydrolysis of [2-(phenylazo)phenyl-C,N']tellurium(II) chloride (17). The reaction of 13 with an alkaline solution resulted in the formation of the corresponding bis[2-(phenyl-azo)phenyl-C,N']tellurium(IV) oxide (23) and dichlorobis[2-(phenylazo)phenyl-C,N']tellurium(IV) oxide (24). The identity of all the derivatives was confirmed by multinuclear NMR ((1)H, (13)C, (125)Te) and FT-IR spectroscopy, elemental analysis, and ESI-MS. The structures for tellurium derivatives 6, 10-14, 17, 19, 20-23, and 23A were also confirmed by X-ray crystallography. Density functional theory (DFT) was utilized for optimizing the geometries of 11, 13, and 14 to examine the possibility of a four-membered intramolecular Te center dot center dot center dot N interaction.
URI: http://dx.doi.org/10.1021/om1009022
http://dspace.library.iitb.ac.in/jspui/handle/100/14264
ISSN: 0276-7333
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