European Journal of Chemistry

Kinetics and mechanism of aquation of bromopentammine cobalt(III) cation assisted by ion-pairing succinate anion in ethane-2-diol-water mixtures

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Published: Jun 30, 2012
DOI: https://doi.org/10.5155/eurjchem.3.2.196-201.583
Keywords:
Ion-pairing, Ethane-1, 2-diol, Solvent effect, Thermodynamics, Kinetics of aquation, Bromopentammine cobalt(III)
Section
Research Article
Issue
Vol. 3 No. 2 (2012): June 2012
Dates
Received 2012-01-04
Accepted 2012-03-09
Published 2012-06-30


Main Article Content

Amel Moustafa Ismail
Chemistry Department, Faculty of Science, Alexandria University, Ibrahimia, Alexandria, 21321, Egypt
Seleim Mohamed Seleim
Chemistry Department, Faculty of Science, Alexandria University, Ibrahimia, Alexandria, 21321, Egypt
Amal Abd-El-Hamid Zaghloul
Chemistry Department, Faculty of Science, Alexandria University, Ibrahimia, Alexandria, 21321, Egypt
Mohamed Fawzy Amira
Chemistry Department, Faculty of Science, Alexandria University, Ibrahimia, Alexandria, 21321, Egypt

Abstract

The aquation kinetics of bromopentammine cobalt(III) ion has been investigated in the presence of different concentrations of succinate ion in aqueous medium and that mixed with ethane-1,2-diol (up to 50%, w/w) within the temperature range (35-65 oC). The ion-pairing succinate ion concentration (L) and the observed rate constant have been determined at different experimental conditions. The thermodynamic parameters of activation have been calculated and discussed in terms of solvent effects. Also the extrathermodynamic analyses of the obtained results have been discussed on the basis of solute-solvent and solvent-solvent interactions. An empirical correlation between the rate coefficient and the concentration of the ion-pairing succinate ligand (L) has been established and a suggested reaction mechanism is proposed.

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Ismail, A. M.; Seleim, S. M.; Zaghloul, A. A.-E.-H.; Amira, M. F. Kinetics and Mechanism of Aquation of Bromopentammine cobalt(III) Cation Assisted by Ion-Pairing Succinate Anion in Ethane-2-Diol-Water Mixtures. Eur. J. Chem. 2012, 3, 196-201.

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