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Spectrometric study of solute–solvent interactions for the solvolysis of chloropentaamine cobalt(III) complex in binary aqueous mixtures

✍ Scribed by Gehan M. El-Subruiti; Ghassan O. Younes; Farah S. Zeitouni; Mohamed F. Amira

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
198 KB
Volume
40
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

Kinetic studies of solvent structure effects and solute–solvent interactions on the solvolysis of [Co(NH~3~)~5~Cl]^2+^ complex ion have been investigated spectrophotometrically in binary aqueous mixtures. Three cosolvents were used (acetonitrile, dimethylsulfoxide, and urea) over a wide range of temperatures. Nonlinear plots were found for log(rate constant) against the reciprocal of the relative permitivity of the medium. The enthalpy and entropy of activation (Δ__H__^#^ and Δ__S__^#^) exhibited extrema in the same composition region where the physical properties indicate sharp changes in the structure of the solvent, confirming that the solvent structure is an important factor in determining the solvolytic reactivity. © 2008 Wiley Periodicals, Inc. Int J Chem Kinet 40: 416–422, 2008

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