Photoionization and γ-Induced Oxidation of Aromatic Amines in Rigid Organic Glasses

Photoionization of N,N-dimethyl-p-phenylenediamine occurs in polar glasses at 77 deg K, but not in pure hydrocarbons. Addition of electron- accepting solutes greatly enhances photoionization yields in polar glasses, but only the more easily reduced of these enhance yields in nonpolar glasses. gamma Irradiation produces much higher yields of amine cation in nonpolar glasses than in polar glasses. In both types of media yields can be enhanced by addition of electron acceptors, but yields are much smaller in polar glasses. Results of gamma irradiation indicate that charge transfer is very largely responsible for amine cation yields. (auth)