Mohammed, Y.Idris, S.O.Onu, A.D.Iyun, J.F.2023-12-142023-12-142016-02-05Mohammed, et. et. (2016) STUDIES OF THE KINETICS AND MECHANISM OF THE ELEC TRON TRANSFER REACTIONS OF DIAQUOTETRAKIS(2,2’-BIPYRIDINE)-µ- OXODIRUTH ENIUM(III) ION AND DITHIONITE IN AQ UEOUS MEDIUMhttps://keffi.nsuk.edu.ng/handle/20.500.14448/5525he kinetics and mechanism of the electron transfer reaction of diaquotetrakis(2,2’ -bipyridine)-µ- oxodiruthenium(III) ion (hereafter denoted as Ru2O4+ or [(H2O)2Ru2O]4+) and dithionite ions (S2O 42 ) has been studied in aqueous medium at ionic strength, I, = 0.5 mol dm-3 and temperature, T = 31±1 ºC. The stoichiometry of the reaction was found to be 1:1. The rate of reaction showed first order kinetics with respect to [Ru2O4+] and [S2O 24 ] respectively, second order overall. Rate equation for the reaction has been proposed as; d[((H2O)2Ru2O4+]/dt = kobs[((H2O)2Ru24+] = k2 [((H2O)2Ru2O4+][S2O42-] . Varying I and dielectric constant, D, of the reaction medium had no effect on the reaction rates, while free radicals were not detected in the course of the reaction. Product analysis revealed [(H2O)2(bpy)2Ru]2+as the reduction product of [(bpy)2(H2O)RuORu(H2O)(bpy)2]4+. Spectroscopic evidence of formation of stable intermediate complex was lacking which, in addition to absence of intercept in the Michaelis – Mentenplot and catalysis/ inhibition of the reaction due to added ions, suggest the implication of outer sphere mechanism operating in the reaction. A plausible mechanism was proposed.enCatalysis/inhibition, electron, intermediate complex, kinetics, mechanism, transfer.Article