Abstract

Intramolecular photoinduced electron transfer reaction of a series of fixed distance triads consisting of free-base porphyrin, zinc porphyrin, and quinone or pyromellitimide have been investigated by means of steady-state fluorescence spectroscopy, picosecond time-resolved fluorescence spectroscopy, and picosecond time-resolved transient absorption spectroscopy. The singlet excited state of the distal free-base porphyrin was found to be quenched by the attached electron acceptor at 298 K in THF and at 77 K in EPA, indicating long distance electron transfer from the free-base porphyrin to the acceptor. However, long-lived charge separated states were not formed in these model compounds.

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