Transfer reactions of Rydberg (Quasi-Rydberg molecular) electrons in condensed media:: IV.: Large proton displacements upon phosphorescence quenching via highly excited triplet states T* of substituted aromatic solute molecules in solutions at 77 K

Intramolecular phosphorescence quenching via states T* in aromatic solute molecules containing N-H (diphenylamine (DPA) or carbazole), O-H (naphthol), etc. bonds was observed in methylcyclohexane at 77 K. The quantum yield of quenching measured for DPA increases with increasing the energy of the T* state. As in the case of external electron acceptors, the quenching and photodissociation are associated with the capture of excited pi* electrons onto polarized bonds N-Hdelta+, O-Hdelta+ and with the formation of triplet complexes (for example, Ph2N . . .H*, where H* is the excited hydrogen atom). The complexes can be deactivated via configurations with large proton displacement distances (Ph2N-. . .H+).