A kinetic study of the reaction between thiourea and ethylenediaminetetraacetato ruthenate(III) complex by the stopped flow technique

Taqui Khan, M. M. ; Naik, R. M. (1989) A kinetic study of the reaction between thiourea and ethylenediaminetetraacetato ruthenate(III) complex by the stopped flow technique Polyhedron, 8 (4). pp. 463-467. ISSN 0277-5387

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0277-5387(00)80742-1

Abstract

The kinetics of reaction between thiourea and [RuIII (H-EDTA)(H2O)] (1) were investigated in aqueous solution as a function of pH, temperature and metal ion concentration at 0.1 M ionic strength using the stopped flow technique. It was established that the monoanionic species of complex 1, [RuIIIEDTA)(H2O)] (2) is the major reacting species over the pH range 1.5-8.5. The substitution reaction follows first-order kinetics in [Ru(EDTA)(H2O)] as well as in thiourea concentrations over a wide concentration range of the two reactants. The rate constant (k1) was found to be (2.04±0.17) ×103M−1 s−1 at 25°C and μ=0.1 M (KCl). From the activation parameters of the reaction it was concluded that the substitution reaction of [Ru(EDTA)H2O] follows an associative mechanism. The reactivities of different species of the thiourea complexes formed, have also been discussed.

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