KINETICS AND MECHANISM OF SUBSTITUTION IN S-DIAQUA-BIS[2-(M-TOLYLAZO)PYRIDINE]-RUTHENIUM(II) ION BY SALICYLADOXIME

The kinetics and mechanism of the title reaction have been investigate d spectrophotometrically as a function of [reactant complex], pH (4-6) , [incoming ligand], temperature (35-50-degrees-C) and medium dielectr ic constant. The kinetic and activation parameters measured for this r eaction fall within the characteristic range of those respective param eters for the substitution of the title complex by many other ligands previously reported and are insensitive to the nature of incoming liga nds. A dissociative mechanism is proposed. The effect of medium dielec tric constant variation on the reaction rate is also a logical consequ ence of such mechanism.