Intramolecular photoinduced electron-transfer processes in tetrathienylethylene-quaterthiophene-[60]fullerene triad in solutions

被引:30
作者
Yamanaka, KI
Fujitsuka, M
Araki, Y
Ito, O [1 ]
Aoshima, T
Fukushima, T
Miyashi, T
机构
[1] Tohoku Univ, CREST, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan
[2] Tohoku Univ, Grad Sch Sci, Dept Chem, Aoba Ku, Sendai, Miyagi 9808587, Japan
关键词
D O I
10.1021/jp036932h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Intramolecular photoinduced charge-separation and recombination processes in a covalently connected tetrathienylethylene-quaterthiophene-C-60 (TTE-4T-C-60) triad have been studied by time-resolved fluorescence and transient absorption spectral methods. The observed low fluorescence intensity and the short fluorescence lifetime of the C-60 moiety of the triad in benzonitrile (PhCN) indicate that charge separation takes place via the singlet excited state of the C-60 moiety in quite fast rate and high efficiency. The nanosecond transient absorption spectra in PhCN showed the broad absorption bands in the 600-1500 ran region, which were attributed to (TTE-4T)(.+)-C-60(.-), in which the radical cation (hole) delocalizes both on the TTE and 4T moieties. The charge-separated state decays to the neutral triad with a lifetime of 18 ns in PhCN at room temperature. From temperature dependence of the charge-recombination rate constants, the reorganization energy was evaluated to be 0.74 eV, which indicates that the charge-recombination process is in the inverted region of the Marcus parabola. In toluene, TTE-4T-C-1(60)* predominantly descends to TTE-4T-C-3(60)*, which decays to the ground state.
引用
收藏
页码:250 / 256
页数:7
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