Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/10174
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
Series/Report no.: Int. Cl.9 C07C395/00
Abstract: Diethyl tellurium bis(carboxylates) (C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>TeR¢<sub>2</sub> (R′ = C<sub>6</sub>H<sub>5</sub>OCO, 4-NO<sub>2</sub>C<sub>6</sub>H<sub>4</sub>OCO, 3,5-(NO<sub>2</sub>)<sub>2</sub>C<sub>6</sub>H<sub>3</sub>OCO, C<sub>6</sub>H<sub>5</sub>CH=CHOCO, 4-OCH<sub>3</sub>C<sub>6</sub>H<sub>4</sub>OCO) have been synthesised from the metathetical reactions of diethyl tellurium diiodide (C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>TeI<sub>2</sub> and corresponding silver salts and characterized by IR, <sup>1</sup>H, <sup>13</sup>C and <sup>125</sup>Te NMR spectroscopy. The structures of (C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>TeI<sub>2</sub>, (C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>Te(C<sub>6</sub>H<sub>5</sub>OCO)<sub>2</sub>, (C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>Te(4-NO<sub>2</sub>C<sub>6</sub>H<sub>4</sub>OCO)<sub>2</sub>, (C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>Te{3,5-(NO<sub>2</sub>)<sub>2</sub>C<sub>6</sub>H<sub>3</sub>OCO}<sub>2</sub>, (C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>Te(C<sub>6</sub>H<sub>5</sub>-CH=CHOCO)<sub>2</sub> and (C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>Te(4-OCH<sub>3</sub>C<sub>6</sub>H<sub>4</sub>OCO)<sub>2</sub> 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(<i style="">sp<sup>2</sup></i>)-H---O and C(<i style="">sp<sup>3</sup></i>)-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 (C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>TeI<sub>2</sub> by replacing the iodines with carboxylate groups is demonstrated and the cooperative participation of intermolecular C(<i style="">sp<sup>2</sup></i>)-H---O and C(<i style="">sp<sup>3</sup></i>)-H---O hydrogen bonds in strengthening the supramolecular assemblies is discussed.
Description: 1197-1205
URI: http://hdl.handle.net/123456789/10174
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.49A(09) [September 2010]

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