Reactions of iron(II) protoporphyrin with strongly reducing free radicals in aqueous solutions. A pulse-radiolytic study

Abstract

Iron(II) protoporphyrin, Fe^IIPP, is reduced by e^–_aq and CO^˙–₂ in aqueous solutions to Fe^IPP, which might be present in aqueous solutions as Fe^IIIPP—H. The spectrum of the short-lived intermediate and the kinetics of its decomposition into Fe^IIIPP + H₂ are reported. The free radicals ˙CH₂OH, ˙CH(CH₃)OH and ˙C(CH₃)₂OH react with Fe^IIPP forming Fe^IIIPP—CR₁R₂OH; the spectra of these intermediates, which decompose into Fe^IIIPP + HCR₁R₂OH, are reported.