Free Radical Combination Reactions Involving Phenoxyl Radicals

Article abstract of DOI:10.1021/j100133a018

The rates of phenoxyl radical reactions with the superoxide anion radical, O2^.-, a peroxyl radical, HOC(CH3)2CH2OO^., and an alkyl radical, HOC(CH3)2CH2^., in aqueous solution have been measured for 15 different phenoxyl radicals by means of pulse radiolysis.In addition, the one-electron reduction potentials of 10 phenoxyl radicals have been determined.The fraction of electron transfer in the reaction of phenoxyl radicals with O2^.- was determined by analysis of γ-irradiated samples.The experimental data can be accommodated by the Marcus theory for electron transfer, with the reorganization energy λ⁰ = 155 kJ/mol for the reaction between O2^.- and phenoxyl radicals.