Spectrophotometry, electrochemistry and kinetics of interaction of N-hydroxyethylethylenediaminetriacetate complex of ruthenium(III) with dimethyl sulphoxide

Abstract

The interaction of pentadentate Hedtra (Hedtra =N-hydroxyethylethylenediarninetriacetate) complex of ruthenium(III) ([Ru^III(Hedtra)(H₂O)]<strong>1</strong>) with dimethyl sulphoxide has been investigated using spectrophotometric, electrochemical (CV) and kinetic techniques. In the presence of large excess of DMSO, formation of a weak S-bound complex [Ru^III(Hedtra)(DMSO)] <strong>2</strong> (<em>K </em> = 0.45 dm³ mol^-1 at 25°C) is suggested. The equilibrium and rate data estimated from different techniques, viz., spectro-photometry, cyclic voltammetry and kinetic studies, are in close agreement. The rate data are compared with those for other thio ligand substitution of [Ru^III(Hedtra),(H₂O)] complex.