Abstract
In order to elucidate the dynamics and mechanisms of photoinduced electron transfer and back electron transfer deactivation as well as excitation transfer in some hybrid dimers of porphyrins connected by covalent chains, picosecond time-resolved transient absorption spectral measurements as well as picosecond time-resolved fluorescence measurements were made on these systems. A large difference between the rates of the photoinduced electron transfer and back electron transfer has been observed even though the exothermicities of the two processes are the same. A theoretical interpretation has been advanced to account for this difference.
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