Pulse radiolysis studies of a perylene derivative in aqueous solution

Reactions of (OH)-O-.. radicals and hydrated electrons with a water-soluble perylene derivative have been investigated in aqueous solutions by pulse radiolysis. In the absence of other additives,(OH)-O-.. radicals and hydrated electrons, respectively, add the perylene molecule. While the electron adduct (absorption peaking at 615 nm) decays by a single reaction, the behavior of the (OH)-O-.. adduct (absorbance peaking at 595 nm) is complicated. Its formation is followed by several processes attributed to bimolecular decay in competition with rearrangement and decarboxylation reactions. The OH-adduct and the subsequent transients react with reductants such as thiol and ferrocyanide and with oxidants such as ferricyanide. A reaction mechanism is proposed. (C) 1999 Elsevier Science Ltd. All rights reserved.