Kinetics and mechanism of substitution in <em>cis</em>-diaqua-bis[ 2-(<em>m</em>-tolylazo)pyridine]-ruthenium(II) ion by salicylaldoxime

Abstract

The kinetics and mechanism of the title reaction have been investigated spectrophotometrically as a function of [reactant complex], <em>p</em>H (4-6), [incoming ligand], temperature (35-50°C) and medium dielectric constant. The kinetic and activation parameters measured for this reaction fall within the characteristic range of those respective parameters for the substitution of the title complex by many other ligands previously reported and are insensitive to the nature of incoming ligands. A dissociative mechanism is proposed. The effect of medium dielectric constant variation on the reaction rate is also a logical consequence of such mechanism.