KINETICS AND MECHANISTICS STEPS TO THE ELECTRON TRANSFER REACTION OF PEROXO-BRIDGED BINUCLEAR COBALT(III) COMPLEX OF SUCCINIMIDE BY GLYCINE IN AQUEOUS ACIDIC MEDIUM

The kinetics and mechanistic steps to the electron transfer reaction of the peroxo-bridged binuclear cobalt(III) complex of succinimide [(suc)(en)(2)Co(O-2)Co(en)(2)(suc)(2+)] hereafter called peroxo-bridged dicobalt(III) complex '[Co(O-2)Co2+]' by glycine have been carried out spectrophotometrically at lambda = 420 nm and T = 26 +/- 1 degrees C, [H+] = 1 x 10(-3) M and u = 0.5 M (NaCl) in aqueous acidic medium. The reaction was found to be first order with respect to [Co(O-2)Co2+] and [(Gly] and experimental data indicates a second-order overall. The reactions obeyed the general rate law: (d[Co(O-2)Co-2+]/dt) = (a +b)[H+])[Co(O-2)Co2+][Gly]. Varying hydrogen ion concentration accelerated the reaction rate and shows first-order dependence while the reactions also affected by changes in the ionic strength of the reaction medium by giving a non-negative salt effect in the course of the reaction. Free radicals were not detected in the reactions. Spectroscopic investigation and Michaelis-Menten plots suggest the absence of intermediate complex formation. The experimental result obtained in this system is concluded in favor of the outer-sphere mechanism.