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Spectrometric study of solute–solvent interactions for the solvolysis of chloropentaamine cobalt(III) complex in binary aqueous mixtures
Author(s) -
ElSubruiti Gehan M.,
Younes Ghassan O.,
Zeitouni Farah S.,
Amira Mohamed F.
Publication year - 2008
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20324
Subject(s) - chemistry , solvolysis , solvent , aqueous solution , enthalpy , acetonitrile , inorganic chemistry , reactivity (psychology) , thermodynamics , organic chemistry , hydrolysis , medicine , physics , alternative medicine , pathology
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