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
来源：
CHEMPHYSCHEM | 2004年 / 5卷 / 07期
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
相关论文
共 33 条
[1]   Comparison between MCM-41 and periodic mesoporous organosilica:: Charge-transfer donor-viologen complexes as probes [J].
Alvaro, M ;
Ferrer, B ;
Fornés, V ;
García, H .
CHEMPHYSCHEM, 2003, 4 (06) :612-617
[2]   A periodic mesoporous organosilica containing electron acceptor viologen units [J].
Alvaro, M ;
Ferrer, B ;
Fornés, V ;
García, H .
CHEMICAL COMMUNICATIONS, 2001, (24) :2546-2547
[3]   Photochemical modification of the surface area and tortuosity of a trans-1,2-bis(4-pyridyl)ethylene periodic mesoporous MCM organosilica [J].
Alvaro, M ;
Ferrer, B ;
García, H ;
Rey, F .
CHEMICAL COMMUNICATIONS, 2002, (18) :2012-2013
[4]   Simultaneous modification of mesopores and extraction of template molecules from MCM-41 with trialkylchlorosilanes [J].
Antochshuk, V ;
Jaroniec, M .
CHEMICAL COMMUNICATIONS, 1999, (23) :2373-2374
[5]  
ANTOCHSHUK V, 2000, STUD SURF SCI CATAL, V129, P265
[6]   Development of a femtosecond diffuse reflectance spectroscopic system, evaluation of its temporal resolution, and applications to organic powder systems [J].
Asahi, T ;
Furube, A ;
Fukumura, H ;
Ichikawa, M ;
Masuhara, H .
REVIEW OF SCIENTIFIC INSTRUMENTS, 1998, 69 (02) :361-371
[7]   Periodic mesoporous organosilicas with organic groups inside the channel walls [J].
Asefa, T ;
MacLachlan, MJ ;
Coombs, N ;
Ozin, GA .
NATURE, 1999, 402 (6764) :867-871
[8]  
Asefa T, 2000, ANGEW CHEM INT EDIT, V39, P1808, DOI 10.1002/(SICI)1521-3773(20000515)39:10<1808::AID-ANIE1808>3.0.CO
[9]  
2-G
[10]   A NEW FAMILY OF MESOPOROUS MOLECULAR-SIEVES PREPARED WITH LIQUID-CRYSTAL TEMPLATES [J].
BECK, JS ;
VARTULI, JC ;
ROTH, WJ ;
LEONOWICZ, ME ;
KRESGE, CT ;
SCHMITT, KD ;
CHU, CTW ;
OLSON, DH ;
SHEPPARD, EW ;
MCCULLEN, SB ;
HIGGINS, JB ;
SCHLENKER, JL .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1992, 114 (27) :10834-10843
1234