| Abstract: | Photoinduced Decomposition of Arene Diazonium Salts by Pyrazolone and Naphthole Dyes The pyrazolone dyes 1–4 in their photoexcited singlet states bleached out by arene diazonium salts which dediazoniate during the reaction. Both compounds react in equal proportion. The quantum yields increase with the increasing of the concentration and electron acceptor properties of the diazonium salts and increasing of the electron donor properties of the dyes. The quantum yields of dye bleaching decrease on addition of DABCO or allylic thiourea, whereas the dediazoniation is not influenced. A kinetic model based on a primary electron transfer from the excited dye to arene diazonium salt is presented and used to determine rate constants for individual partial reactions. |
