Dynamics of photoinduced electron transfer in model multiporphyrin ensembles

It is shown by the methods of picosecond fluorescent and femtosecond absorptive spectroscopy that in the nanosize self-assembled complexes based on a Zn-octaethylporphyrin dimer and electron acceptors of different nature (quinone, anthraquinone, pyromellitimide) deactivation of the energy of electron excitation is caused by the nonradiative S-S-energy transfer (for times ≤10 psec) and photoinduced charge transfer (within the range of 300 fsec-700 psec). In tetrads an electron is transferred from a porphyrin extra-ligand to quinone for distances rDA≈18–21 Å by the “superexchange” mechanism. In triads, the charge transfer from a dimer to a fluorinated porphyrin extra-ligand is efficient at 120-77 K.