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Kinetics of aquation of Co(III) complex in binary aqueous mixtures and effect of multiparameters of the solvent on the reaction rate
Author(s) -
ElSubruiti Gehan M.,
Fathalla Magda F.,
ElMarassi Yasser R.
Publication year - 2011
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.20535
Subject(s) - aquation , chemistry , solvation , solvent , solvent effects , kinetics , aqueous solution , reactivity (psychology) , thermodynamics , inorganic chemistry , computational chemistry , reaction rate constant , organic chemistry , medicine , physics , alternative medicine , pathology , quantum mechanics
Abstract Kinetics and solvent effects of the aquation of trans[Co(4‐(Etpy) 4 Cl 2 ] + have been studied in ethanol + water ranging from 0 to 60% (v/v) and urea + water of various solvent compositions up to 40% (w/w) of organic solvent. Thermodynamic activation parameters were computed and discussed in terms of the solvation effect. Isokinetic temperature within the experimental range revealed that the existence of the compensation effect arising from the solute–solvent interaction. Nonlinear plots of log k with D −1 suggest that changes in the solvent structure are an important factor that influences these rates. The influence of the added cosolvent on reactivity was analyzed in light of various simple and multiple regression equations using Kirkwood, E T (30), and Kamlet–Taft parameters. The obtained results showed that the solvation phenomenon plays a dominant role in the aquation. © 2011 Wiley Peiodicals, Inc. Int J Chem Kinet 43: 230–237, 2011