Kinetics of electron transfer: the reaction of acetatopenta-amminecobalt(III) with N-methyliminodiacetatoiron(II)

Abstract

The rate of reduction of acetatopenta-amminecobalt(III) by iron(II) is greatly enhanced by the presence of N-methyliminodiacetic acid (H₂L). In glycine buffer medium the effective reducing agent is Fe^IIL, and the reaction is of the second order: -d[Co^III]/dt= k₂[Co^III(NH₃)₅OAc²⁺][Fe^IIL] with k₂=(1·52 ± 0·12)× 10^–3 dm³ mol^–1 s^–1 at 25 °C, ionic strength 1·0M(NaClO₄); ΔH₂‡=(21·7 ± 1·1) kcal mol^–1.