Kinetics and mechanism of the reduction of manganese(III) in perchloric acid at a platinum electrode

Abstract

The electrode kinetics at 25°C of the reduction of manganese(III) on an oxidised platinum surface confirms an unusually low transfer coefficient of 0.26. Interpretation involving a comparison with a correlation of hydrolytic constants of similar trivalent cations and their several redox potentials points to a hydroxo-or oxo-bridged transition state. The Mn^III/Mn^II conditional standard electrode potential was observed to be 1.535 V at ionic strength 3.31 mol dm^–3 against H₂|HClO₄(3 mol dm^–3), NaClO₄(0.31 mol dm^–3).