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Photoinduced Electron Transfer of Fullerenes (C60 and C70) Studied By Transient Absorption Measurements in Near-Ir Region

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Efficiencies and rates of electron transfer from various electron donors to excited fullerenes (C60 and C70) have been determined by observing the transient absorption bands in the near-IR region, where the anion radicals of fullerenes appear. From the rise of the absorption bands of C60-' and C70-' in the near-IR region, electron transfer takes place via the triplet states (TC60* and TC70*) under appropriately low concentrations of electron donors. By analysis of the rise curves C60-' and C70-', contribution of the excited singlet states (sC60* and sC70*) in addition to the route of the triplet states (TC6* and TC70*) is confirmed. The quantum yield for electron transfer via the triplet states (ΦetT) was evaluated by the ratio of [C60-']/[TC60*] (or [C70-']/[TC70*]). The ΦetT depends upon the donor-ability, donor concentration, and solvent polarity. The back electron-transfer process, which was evaluated by observing C60-', also depends upon the solvent polarity.

Affiliations: 1: Institute for Chemical Reaction Science, Tohoku University, Katahira, Sendai, 980-77, JAPAN


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