Photophysical studies of 1,2-C70H2

被引:6
作者
Benedetto, AF [1 ]
Bachilo, SM [1 ]
Weisman, RB [1 ]
Nossal, JR [1 ]
Billups, WE [1 ]
机构
[1] Rice Univ, Dept Chem, Houston, TX 77005 USA
关键词
D O I
10.1021/jp9928412
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
Photophysical measurements have been made on 1,2-C70H2, the most stable isomer of the simplest C-70 derivative. This dihydride's electronic absorption spectrum is more diffuse than that of C-70 Red shifts in the fluorescence and phosphorescence emission spectra show that excitations to the lowest singlet and triplet electronic states require approximately 8% less energy in 1,2-C70H2 than in C-70 and that the S-1-T-1 gap of 1,2-C70H2 is ca. 310 cm(-1) smaller than that of the parent fullerene. The dominant peak in the dihydride's T-n <-- T-1 near-infrared absorption spectrum falls at 1050 nm. Compared to the corresponding transition of C-70, this absorption feature is broadened, red-shifted by 75 nm, and reduced in peak molar absorptivity by a factor of 2. Derivatization of C-70 to form 1,2-C70H2 accelerates T-1 decay by more than an order of magnitude, giving an intrinsic triplet Lifetime of 2.0 ms at room temperature. The rate constant for triplet deactivation through ground stale self-quenching is near 7.6 x 10(7) M-1 s(-1), or approximately twice that of C-70.
引用
收藏
页码:10842 / 10845
页数:4
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