Electron spin resonance studies. Part XXXIX. A kinetic investigation of the role of radical reduction in metal ion–hydrogen peroxide systems

Abstract

Reduction of carbonyl-conjugated radicals by Ti^III and Fe^II in aqueous solution has been investigated by e.s.r. spectroscopy and pulse radiolysis. Kinetic data have enabled the importance of such reactions in metal ion–hydrogen peroxide systems to be assessed. For example, reduction by Ti^III at pH 1 is negligible under typical flow system conditions whereas at pH 7 reduction by Ti^III–EDTA can provide an important pathway for radical termination. The dependence of reduction rates on radical structure has been investigated.