1997 年 55 巻 8 号 p. 678-685
Recently, photoinduced electron transfer (PET) reactions have been focused on the behavior of radical-ion species. Here, we review the PET reactions of azo compounds, especially azoalkanes. Ground state interactions between azoalkanes and cationic salts have been investigated. On the basis of these results, studies of CT band excitation and PET reactions are developed. There are two types of the PET reactions. One is the electron transfer from the excited molecules of azoalkanes to the ground state electron acceptor molecules, and the other is the electron transfer from the ground state molecules of azoalkanes to the excited electron acceptor molecules.
Products via cation intermediates are given from the reactions of acyclic azoalkanes and rearranged products are produced from the reaction of cyclic azo compounds. In many cases, it is known the back electron transfer plays very important role in the PET reaction.