Photochemical reactions between photo-excited C60 and borates (-BPh4 and -BPh3Bu) have been investigated by steady-state photolysis and laser flash photolysis. On steady-state photolysis of C60 in the presence of the borates in polar solvents, the absorption OfC60-• increases with irradiation time, suggesting that irreversible photoinduced electron-transfer occurs. By the measurements of the transient absorption spectra, it is indicated that electron transfer takes place from the borate anions to 3C60*, yielding C60-• and •BPh3R (R = Ph or Bu), in which the latter dissociates into Ph3B and R•, yielding biphenyl (or octane). Electron-donor ability of -BPh3 Bu is higher than that of -BPh4, while the steady-state photolysis to a C60/borate system shows an opposite tendency. The addition reaction of C60-• with Bu• yielding BuC60- is more efficient than that with Ph• producing PhC60-. The rate constant of electron-transfer via the triplet state of C60 increases with solvent polarity.
|Number of pages||6|
|Journal||Journal of the Chemical Society. Perkin Transactions 2|
|Publication status||Published - 1999 Mar|
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