

Studies on ion-pairing effects of the kinetics of aquation of bromopentaammine cobalt(III) complex in malonate media
Farah Samih Zeitouni (1)




(1) Chemistry Department, Faculty of Science, Beirut Arab University, Riad El-Solh, Beirut-11-5020, Lebanon
(2) Chemistry Department, Faculty of Science, Alexandria University, Ibrahimia, Alexandria-21321, Egypt
(3) Chemistry Department, Faculty of Science, Beirut Arab University, Riad El-Solh, Beirut-11-5020, Lebanon
(4) Chemistry Department, Faculty of Science, Alexandria University, Ibrahimia, Alexandria-21321, Egypt
(*) Corresponding Author
Received: 13 Apr 2011 | Revised: 27 Jun 2011 | Accepted: 05 Jul 2011 | Published: 31 Dec 2011 | Issue Date: December 2011
Abstract
The aquation of bromopentaamminecobalt(III) ion in the presence of ion-pairing malonate anion in mixed solvent media of water with tert-butanol (10%-50%) v/v have been investigated spectrophotometrically at different temperatures (30-60 oC). Nonlinear plots of Log (kip) ion-pair rate constants against the reciprocal of the dielectric constant D, Log of water concentration and Grunwald-Winstein Y values were found. The thermodynamic and extrathermodynamic analyses of the kinetic data have been discussed in terms of solvent effect on the ion-pair aquation reactions. The obtained isokinetic temperatures of these systems indicate the existence of compensation effect arising from solute-solvent interaction. The extrema found in the change of ∆Hip* and ∆Sip*with the mole fraction of the co-solvent can be attributed to the change of the physical properties of the solvent-water mixture with the solvent structure. Application of a free energy cycle is performed to compare between the stability of the initial and the transition state of the complex. However, small changes in ∆Gip*with the mole fraction of the co-solvent was found, indicating a compensating effects between ∆Hip* and ∆Sip*
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European Journal of Chemistry
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DOI: 10.5155/eurjchem.2.4.489-494.440
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Beirut Arab University, Faculty of Science, Chemistry Department, Beirut-11-5020, Lebanon
Citations
[1]. Farah Samih Zeitouni, Mohammad Fawzi Amira, Gehan Moustafa El-Subruiti, Ghassan Omar Younes
Comparison of the leaving groups during the study of the aquation of halopentaammine cobalt(III) complex in tartarate at different percentage of tert-butanol
European Journal of Chemistry 9(3), 228, 2018
DOI: 10.5155/eurjchem.9.3.228-235.1728

[2]. Farah Samih Zeitouni, Jinane Kamal Chaaban, Ramzi Kassem Hamed
Kinetic studies of ion-pairing effects on the aquation of chloropentaammine cobalt(III) complex in different dicarboxylate media at 30% of tert-butanol
European Journal of Chemistry 8(3), 273, 2017
DOI: 10.5155/eurjchem.8.3.273-278.1609

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