Abstract
Photophysical and photochemical properties of C76 have been investigated by using nano- and picosecond laser flash photolysis methods. In the nanosecond laser flash photolysis of C76, transient absorption ascribable to the triplet excited state of C76 (TC76*) was observed in the visible and near-IR regions. From the generation of the absorption band of TC76*, the lifetime of the singlet excited state was estimated to be 1.7 ns. Under the presence of β-carotene in toluene, TC76* was deactivated by energy transfer to β-carotene at a 2.6 × 109 M-1 s-1 rate constant. Electron-transfer reaction to TC76* was also confirmed in a benzonitrile solution containing C76 and tetramethyl-p-phenylenediamine (TMPD) as an electron donor. A bimolecular rate constant for quenching of TC76* by TMPD was estimated to be 7.8 × 108 M-1 s-1.
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