Intramolecular electron-transfer process of porphyrin-fullerene dyad linked by phenyl buta-1,3-diynyl-phenyl unit (ZnP-sp-C60) was studied by laser flash photolysis. Picosecond fluorescence lifetime and transient absorption measurements revealed that photoinduced charge-separation takes place via the excited singlet state (1ZnP*) with the rate constant of (1-2) × 1010 s-1. For the charge recombination, about a half of the radical-ion pair decayed quickly with 2.9 × 10 9 s-1 as evaluated from picosecond transient absorption measurements, whereas the remaining half was long-lived with slow decay (1.6 × 106 s-1) as estimated from nanosecond transient absorption measurements. The lifetime of the radical-ion pair of ZnP-sp-C 60 was longer than those of directly connected dyads with a buta-1,3-diynyl bridge and buta-1,3-diynyl-phenyl bridge by the insertion of an extra phenyl group in addition to the pyrrodino ring.
|ジャーナル||Journal of Porphyrins and Phthalocyanines|
|出版物ステータス||Published - 2007 1 1|
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