European Journal of Chemistry 2017, 8(3), 273-278. doi:10.5155/eurjchem.8.3.273-278.1609

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


Farah Samih Zeitouni (1,*) , Jinane Kamal Chaaban (2) , Ramzi Kassem Hamed (3)

(1) Chemistry Department, Faculty of Science, Beirut Arab University, Riad El-Solh, Beirut, Lebanon
(2) Laboratory of Material, Catalysis, Environmental and Analytical Methods, Faculty of Sciences, Section I, Lebanese University, Hadath, Beirut, Lebanon
(3) Faculty of Pharmacy, Lebanese University, Hadath, Beirut, Lebanon
(*) Corresponding Author

Received: 05 Jul 2017, Accepted: 12 Aug 2017, Published: 30 Sep 2017

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.


Keywords


Ion-pair; Aquation; tert-Butanol; Solvent effect; Dicarboxylic acid; Cobalt(III) complex

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DOI: 10.5155/eurjchem.8.3.273-278.1609

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[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
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How to cite


Zeitouni, F.; Chaaban, J.; Hamed, R. Eur. J. Chem. 2017, 8(3), 273-278. doi:10.5155/eurjchem.8.3.273-278.1609
Zeitouni, F.; Chaaban, J.; Hamed, R. 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(3), 273-278. doi:10.5155/eurjchem.8.3.273-278.1609
Zeitouni, F., Chaaban, J., & Hamed, R. (2017). 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), 273-278. doi:10.5155/eurjchem.8.3.273-278.1609
Zeitouni, Farah, 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 [Online], 8.3 (2017): 273-278. Web. 17 Sep. 2019
Zeitouni, Farah, Chaaban, Jinane, AND Hamed, Ramzi. "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 [Online], Volume 8 Number 3 (30 September 2017)

DOI Link: https://doi.org/10.5155/eurjchem.8.3.273-278.1609

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