Electron phototransfer in a porphyrin-containing polymer in the presence of electron acceptor

Electron phototransport in a polyconjugated porphyrin-containing polymer was studied in the presence of bromanil, an electron acceptor of the quinone nature. It is established that the photoinduced separation of charge in this system proceeds via a two-quantum mechanism, Photoexcitation of the polymer in the long-wave range (lambda > 540 nm) leads to the intramolecular photoinduced transfer of electron from the polyconjugated system of backbone to porphyrin fragments of the macromolecule. Absorption of the second light quantum results in the intermolecular photoinduced transfer of electron from a radical anion of porphyrin fragment to neutral polymer molecules, followed by the dark transfer of electron to acceptor.