Issue 24, 2005
From the journal:

Dalton Transactions

Equilibrium, kinetic and solvent effect studies on the reactions of [RuIII(Hedta)(H2O)] with thiols†

Mohamed M. Shoukry,ac   Mohamed R. Shehata,a   Mohamed S. A. Hamzabc  and  Rudi van Eldik*c  

* Corresponding authors

a Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt

b Department of Chemistry, Faculty of Science, Ain Shams University, Abbassia, Cairo, Egypt

c Institute for Inorganic Chemistry, University of Erlangen-Nürnberg, Egerlandstr. 1, Erlangen, Germany

Abstract

The interaction of [RuIII(edta)(H2O)]− with a series of selected thiols having extra functional groups was investigated potentiometrically and kinetically. The pKa values of the uncoordinated carboxylic acid group and coordinated water molecule are 3.12 and 7.41, respectively, in aqueous solution at 25 °C and 0.1 M ionic strength. The formation constants of the complexes were determined in the pH range 3–9, and the concentration distribution of the various complex species was evaluated as a function of pH. The effect of dioxane on the pKa values of [RuIII(Hedta)(H2O)] and the formation constants of the corresponding thiol complexes is presented. The study also provides mechanistic information on the reaction of [RuIII(edta)(H2O)]− with the thiols. The low values of ΔH≠ and negative values of ΔS≠ and ΔV≠ for the substitution reactions of [RuIII(edta)(H2O)]− clearly support the associative character of the substitution process.

Graphical abstract: Equilibrium, kinetic and solvent effect studies on the reactions of [RuIII(Hedta)(H2O)] with thiols

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Article information

DOI
https://doi.org/10.1039/B510553F
Article type
Paper
Submitted
25 Jul 2005
Accepted
02 Sep 2005
First published
14 Sep 2005

Dalton Trans., 2005, 3921-3926

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Equilibrium, kinetic and solvent effect studies on the reactions of [RuIII(Hedta)(H2O)] with thiols

M. M. Shoukry, M. R. Shehata, M. S. A. Hamza and R. van Eldik, Dalton Trans., 2005, 3921 DOI: 10.1039/B510553F

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