keywords: Kinetics, mechanism, redox, glutathione, oxidant and reductant
Redox reaction of tetrakis(2,2’- bipyridine)-µ-oxodiiron(III) complex, Fe2O4+ and glutathione (GSH) has been carried out in aqueous hydrochloric acid. The reaction was carried out at [H+] = 0.001 mol dm-3, I = 0.3 mol dm-3 (NaCl), T=27± 1°C, and λmax = 520 nm. One mole of oxidant is consumed per mole of reductant. The reaction is first order with respect to [Fe2O4+] and zero order on [GSH] and is not hydrogen ion and ionic strength dependent. Added anions and cations have no effect on the reaction; moreover there was no gel formation when acrylamide and excess methanol were added to the reaction mixture, which shows the absence of polymerization. With recourse to experimental data, the reaction is rationalised to follow outer sphere mechanism with ion pair character.