Electron transfer from cyclic silicon compounds to photo-excited C60 in polar solvents has been investigated by laser photolysis with observation of the transient absorption bands in the near-IR region. For three-, four- and five-membered cyclic silicon compounds in benzonitrile, the rise of the radical anion of C60 [C60· -] was observed with the rapid decay of the triplet state of C60 [3C60*], indicating that electron transfer takes place via 3C60*. The rate constant (ket) and quantum yield (Φet) of electron transfer decrease with an increase in the number of silicon units. The ket and Φet values of the cyclic silicon compounds are smaller than those of the corresponding cyclic germanium compounds; an especially prominent difference was observed for four-membered cyclic compounds.
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