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IJC-A Vol.49A(09) [September 2010] >


Title: Molecular and supramolecular structures of diethyltellurium diiodide and diethyltellurium bis(carboxylates)
Authors: Srivastava, Prakash C.
Singh, Vikas
Dwivedi, Shrinkhala
Butcher, Ray J
Keywords: Coordination chemistry
Tellurium
Carboxylates
C-H---O hydrogen bonds
Supramolecular associations
Issue Date: Sep-2010
Publisher: CSIR
IPC CodeInt. Cl.9 C07C395/00
Abstract: Diethyl tellurium bis(carboxylates) (C2H5)2TeR¢2 (R′ = C6H5OCO, 4-NO2C6H4OCO, 3,5-(NO2)2C6H3OCO, C6H5CH=CHOCO, 4-OCH3C6H4OCO) have been synthesised from the metathetical reactions of diethyl tellurium diiodide (C2H5)2TeI2 and corresponding silver salts and characterized by IR, 1H, 13C and 125Te NMR spectroscopy. The structures of (C2H5)2TeI2, (C2H5)2Te(C6H5OCO)2, (C2H5)2Te(4-NO2C6H4OCO)2, (C2H5)2Te{3,5-(NO2)2C6H3OCO}2, (C2H5)2Te(C6H5-CH=CHOCO)2 and (C2H5)2Te(4-OCH3C6H4OCO)2 have been established by single crystal X-ray diffraction studies. The structures of these complexes (the immediate environment about tellurium is that of distorted trigonal bipyramidal geometry with a stereochemically active electron lone pair) are described in the context of their ability to generate intermolecular Te---I and Te---O secondary bonds and C(sp2)-H---O and C(sp3)-H---O hydrogen bonds leading to the formation of zig-zag ribbons, stairs, dimeric, trimeric, tetrameric and extended supramolecular assemblies. The modification of supramolecular assembly present in the precursor (C2H5)2TeI2 by replacing the iodines with carboxylate groups is demonstrated and the cooperative participation of intermolecular C(sp2)-H---O and C(sp3)-H---O hydrogen bonds in strengthening the supramolecular assemblies is discussed.
Page(s): 1197-1205
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-0975(Online); 0376-4710(Print)
Source:IJC-A Vol.49A(09) [September 2010]

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