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Intermediates in the reaction of iron(II) with hydrogen peroxide

The reaction of iron(II) with hydrogen peroxide is normally studied by stopped-flow spectrophotometry. Given a mixing time of at best 2 ms, it is possible that the reaction proceeds via an ironoxo(IV) intermediate that decays within the mixing time. With the pulse radiolyis technique we reduced Fe(III) with hydrated electrons in the presence of hydrogen peroxide. No intermediates were observed: iron(III) was reduced within microseconds, after which the oxidation by hydrogen peroxide proceeded with a rate constant as determined by the stopped-flow technique.

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Willem H. KOPPENOL, (Professor)
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