Nature of the transient species formed in the pulse radiolysis of some thiourea derivatives

Abstract

Kinetic and spectral characteristics of the transients formed by the reaction of diethylthiourea and thiosemicarbazide with e^–_aq, H atom and OH radicals and some one-electron reductants and oxidants have been studied by the pulse radiolysis technique. Reactions of e^–_aq and H atom with diethylthiourea produced transient species which were strong reductants, whereas in the case of thiosemicarbazide this was not so. The OH radical reaction in both cases led to the formation of transient species which have absorption bands in the visible region. CO₂H and isopropyl ketyl radicals were found to react with these compounds by H abstraction in the presence of acid to give species similar to those formed by reaction with OH radicals under similar conditions.