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
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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
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Creator |
SRIVASTAVA, K
SHAH, P SINGH, HB BUTCHER, RJ |
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Subject |
O APICAL LINKAGES
MOLECULAR-STRUCTURE CRYSTAL-STRUCTURE ORGANOTELLURIUM COMPOUNDS ORGANOSELENIUM COMPOUNDS TELLURIUM TETRACHLORIDE SUBSTITUTION-REACTIONS NMR-SPECTROSCOPY TRANSFER REAGENT DERIVATIVES |
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Description |
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.
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Publisher |
AMER CHEMICAL SOC
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Date |
2012-06-26T09:09:48Z
2012-06-26T09:09:48Z 2011 |
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Type |
Article
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Identifier |
ORGANOMETALLICS,30(3)534-546
0276-7333 http://dx.doi.org/10.1021/om1009022 http://dspace.library.iitb.ac.in/jspui/handle/100/14264 |
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Language |
English
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