Abstract
This chapter discusses multistep electron and energy transfer in artificial photosynthesis. Three general classes of photophysical and photochemical processes are of great importance in bacterial reaction centers. Photosynthetic organisms employ a variety of antenna pigments to absorb light throughout the useful region of the solar spectrum. These antennas convey the resulting excitation to the special pair via singlet-singlet energy-transfer processes. Carotenoid pigments are responsible for a large fraction of the light used in photosynthesis. In the case of carotenoid-to-tetrapyrrole singlet energy transfer, there is a complication because of the lack of complete information concerning the energies and photophysical parameters of the carotenoid-excited states. In principle, singlet-singlet energy transfer may occur by a trivial emission-absorption mechanism, by a long-range columbic mechanism, or by an electron exchange mechanism similar to that involved in triplet-triplet energy transfer.
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