European Journal of Chemistry

Kinetic studies of ion-pairing effects on the aquation of chloropentaammine cobalt(III) complex in different dicarboxylate media at 30% of tert-butanol

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Published: Sep 30, 2017
DOI: https://doi.org/10.5155/eurjchem.8.3.273-278.1609
Keywords:
Ion-pair, Aquation, tert-Butanol, Solvent effect, Dicarboxylic acid, Cobalt(III) complex
Section
Research Article
Issue
Vol. 8 No. 3 (2017): September 2017
Dates
Received 2017-07-05
Accepted 2017-08-12
Published 2017-09-30


Main Article Content

Farah Samih Zeitouni
Chemistry Department, Faculty of Science, Beirut Arab University, Riad El-Solh, Beirut, Lebanon
Jinane Kamal Chaaban
Laboratory of Material, Catalysis, Environmental and Analytical Methods, Faculty of Sciences, Section I, Lebanese University, Hadath, Beirut, Lebanon
Ramzi Kassem Hamed
Faculty of Pharmacy, Lebanese University, Hadath, Beirut, Lebanon

Abstract

The study of the kinetic aquation of chloropentaammine cobalt(III) ion in the presence of different types of dicarboxylate solutions (Malonate, malate, tartarate and succinate), in mixed solvent media of water with tert-butanol (30%, v:v) is investigated spectrophoto-metrically at different temperatures (30-60 °C) in the light of the effects of ion-pairing on reaction rates and mechanism. Comparison of the kip (Rate constant of ion-pairing) values with respect of different buffers (Malonate, malate, tartarate and succinate) at 30% of tert-butanol is introduced. Examination of the linear free energy relationship (LFER) at the mentioned conditions will lead to diagnosethe mechanism. The free energy of activation ΔG*ip is more or less linearly varied among the studied dicarboxylate ion-pairing ligands indicating the presence of compensation effect between ΔH*ip and ΔS*ip.


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Zeitouni, F. S.; Chaaban, J. K.; Hamed, R. K. Kinetic Studies of Ion-Pairing Effects on the Aquation of Chloropentaammine cobalt(III) Complex in Different Dicarboxylate Media at 30% of Tert-Butanol. Eur. J. Chem. 2017, 8, 273-278.

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Chemistry Department, Faculty of Science, Beirut Arab University, Riad El-Solh, Beirut, Lebanon.
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