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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.49A [2010] >
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 Code: | Int. 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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