Laser Flash Photolysis Study on Photophysical and Photochemical Properties of C82
Laser Flash Photolysis Study on Photophysical and Photochemical Properties of C82
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C82激光闪光光解光物理和光化学性质研究
DOI：
10.1021/jp991983t
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发表时间：
1999
影响因子：
3.3
通讯作者：
T. Akasaka
中科院分区：
文献类型：
--
作者：
M. Fujitsuka;A. Watanabe;O. Ito;Kazunori Yamamoto;H. Funasaka;T. Akasaka
用激光闪光光解方法研究了C_2异构体C_82的光物理和光化学性质。在750 nm处观察到三重激发态的瞬态吸收带，并在近红外区域观察到吸收带尾。本征三重态寿命和系间交叉量子产率分别为56 μs和<0.01，小于C60和C70。C82自由基阴离子的吸收带出现在897 nm处的化学还原与供体，如四（二甲氨基）乙烯。以N，N，N ′，N ′-四甲基-1，4-苯二胺为供体，也观察到了C_（82）的光诱导还原。通过光敏化反应，证实了C82的氧化。C82和BP·+之间的反应速率常数为1.0 × 1010 M-1 s-1，表明与其他富勒烯（C60、C70和C76）一样，可以有效地形成自由基离子。
Photophysical and photochemical properties of C82 (C2 isomer) have been examined by using a laser flash photolysis method. The transient absorption band of the triplet excited state was observed at 750 nm accompanying an absorption band tail in the near-IR region. The intrinsic triplet lifetime and intersystem crossing quantum yield were estimated to be 56 μs and <0.01, respectively, which were smaller than those of C60 and C70. An absorption band of the radical anion of C82 appeared at 897 nm by chemical reduction with donors such as tetrakis(dimethylamino)ethylene. Photoinduced reduction of C82 was also observed by adopting N,N,N‘,N‘-tetramethyl-1,4-phenylenediamine as a donor. By photosensitized reaction, oxidation of C82 was confirmed. The reaction rate constant between C82 and BP•+ was 1.0 × 1010 M-1 s-1, indicating effective radical ion formation as observed with other fullerenes (C60, C70, and C76).