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oai:ojs.www.eurjchem.com:article/1728 2018-09-30T08:12:27Z eurjchem:ART driver

Comparison of the leaving groups during the study of the aquation of halopentaammine cobalt(III) complex in tartarate at different percentage of tert-butanol Zeitouni, Farah Samih Amira, Mohammad Fawzi El-Subruiti, Gehan Moustafa Younes, Ghassan Omar Ion-pair Aquation Tert-butanol Tartaric acid Solvent effect Rate constant of ion-pairing 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*. Atlanta Publishing House LLC 2018-09-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/1728 10.5155/eurjchem.9.3.228-235.1728 European Journal of Chemistry; Vol. 9 No. 3 (2018): September 2018; 228-235 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/1728/pdf_1728 Copyright (c) 2018 Authors