The reduction of ozone in aqueous solution using hexachloroiridate(III) as reductant (net reaction see scheme) obeys the rate law d(IrCl62‐)/dt = 2 k(O3)(IrCl63‐) with k = 1.7·104 M‐1 s‐1 The initial step of this process appears to be an outer‐sphere electron transfer from IrCl63‐ to O3, followed by rapid protonation of O3‐ and oxidation of a second IrCl63‐ by HO3 or OH.
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