Oxidation of hexachloroiridate(III) by OH. Evidence for both inner and outer sphere electron transfer pathways

Abstract

Two rate processes have been observed by optical pulse radiolysis studies for the oxidation of hexachloroiridate(III) by OH in the pH range 3·0–4·5 and the rate constant for the faster process, k₁= 1·3 × 10¹⁰ l mol^–1 s^–1, which comprises both inner and outer sphere electron transfer pathways was found to be independent of pH, whereas the rate constant for the slower process, k₂= 1·2 × 10⁵[H⁺] l mol^–1 s^–1, showed a first-order dependence on the hydrogen ion concentration.