Photochemistry of charge-transfer complexes in a viologen periodic mesoporous organosilica:: Time evolution from femtoseconds to minutes

被引:9
作者
Alvaro, M
Ferrer, B
García, H
Hashimoto, S
Hiratsuka, M
Asahi, T
Masuhara, H
机构
[1] Univ Politecn Valencia, Inst Tecnol Quim, CSIC, Valencia 46022, Spain
[2] Univ Politecn Valencia, Dept Quim, Valencia 46022, Spain
[3] Gunma Coll Technol, Dept Chem, Maebashi, Gumma 3718530, Japan
[4] Osaka Univ, Dept Appl Phys, Suita, Osaka 5650871, Japan
关键词
charge transfer; mesoporous materials; photochemistry; radical ions; viologens;
D O I
10.1002/cphc.200301038
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
Persistent radical cations can be generated in V ∝ PMO, a periodic mesoporous organosilica incorporating a viologen in its silicate framework. Photoexcitation of V ∝ PMO forms a geminate viologen-halide ion pair that can undergo rapid charge recombination or electron hopping to form the nongeminate ion pair, which persists for minutes (see picture). In contrast, viologen-halide CT complexes in solution undergo complete charge recombination on the sub-nanosecond timescale.
引用
收藏
页码:1058 / 1062
页数:5
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