European Journal of Chemistry 2018, 9(3), 228-235. doi:10.5155/eurjchem.9.3.228-235.1728

Comparison of the leaving groups during the study of the aquation of halopentaammine cobalt(III) complex in tartarate at different percentage of tert-butanol


Farah Samih Zeitouni (1,*) orcid , Mohammad Fawzi Amira (2) orcid , Gehan Moustafa El-Subruiti (3) orcid , Ghassan Omar Younes (4) orcid

(1) Chemistry Department, Faculty of Science, Beirut Arab University, Riad El-Solh, Beirut, 11072809, Lebanon
(2) Chemistry Department, Faculty of Science, Alexandria University, Ibrahimia, Alexandria, 21321, Egypt
(3) Chemistry Department, Faculty of Science, Alexandria University, Ibrahimia, Alexandria, 21321, Egypt
(4) Chemistry Department, Faculty of Science, Beirut Arab University, Riad El-Solh, Beirut, 11072809, Lebanon
(*) Corresponding Author

Received: 30 Apr 2018, Accepted: 02 Jun 2018, Published: 30 Sep 2018

Abstract


The experimental kinetic study of aquation for both complexes bromopentaammine cobalt(III) and chloropentaammine cobalt(III) ions in the presence of tartarate solution in mixed solvent media of water with tert-butanol (10-50%, v:v) was examined spectrophotometrically at different temperatures (30-60 °C) by comparing the special effects of the leaving group of chloro and bromo on the rate constant of aquation. Comparison of kip (rate constant of ion-pairing) for both complexes and show the non-linear plots of log (kip) ion-pair rate constants against the reciprocal of the dielectric constant D. The thermodynamic analyses of the kinetic data for both complexes 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 excessive change of ΔHip* and ΔSip* with the mole fraction of the co-solvent can be recognized to the change of the physical properties of the solvent-water mixture with the solvent structure. Undersized changes in ΔGip* with the mole fraction of the co-solvent was found, representing a compensating effects between ΔHip* and ΔSip*.


Keywords


Ion-pair; Aquation ;Tert-butanol; Tartaric acid; Solvent effect; Rate constant of ion-pairing

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DOI: 10.5155/eurjchem.9.3.228-235.1728

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How to cite


Zeitouni, F.; Amira, M.; El-Subruiti, G.; Younes, G. Eur. J. Chem. 2018, 9(3), 228-235. doi:10.5155/eurjchem.9.3.228-235.1728
Zeitouni, F.; Amira, M.; El-Subruiti, G.; Younes, G. Comparison of the leaving groups during the study of the aquation of halopentaammine cobalt(III) complex in tartarate at different percentage of tert-butanol. Eur. J. Chem. 2018, 9(3), 228-235. doi:10.5155/eurjchem.9.3.228-235.1728
Zeitouni, F., Amira, M., El-Subruiti, G., & Younes, G. (2018). 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), 228-235. doi:10.5155/eurjchem.9.3.228-235.1728
Zeitouni, Farah, 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 [Online], 9.3 (2018): 228-235. Web. 22 Sep. 2019
Zeitouni, Farah, Amira, Mohammad, El-Subruiti, Gehan, AND Younes, Ghassan. "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 [Online], Volume 9 Number 3 (30 September 2018)

DOI Link: https://doi.org/10.5155/eurjchem.9.3.228-235.1728

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