TY - JOUR
T1 - Photoinduced electron transfer reactions of highly twisted 1-donor-substituted 2,4,6-triphenylpyridinium cations
AU - Namikawa, Takashi
AU - Kuratsu, Masato
AU - Kozaki, Masatoshi
AU - Matsushita, Toshio
AU - Ichimura, Akio
AU - Okada, Keiji
AU - Yoshimura, Akio
AU - Ikeda, Noriaki
AU - Nozaki, Koichi
N1 - Funding Information:
We thank the Ministry of Education, Culture, Sports, Science and Technology, Japan, for a Grant-in-Aid for Scientific Research (no. 17350072). Appendix A
PY - 2008/2/20
Y1 - 2008/2/20
N2 - Primary processes of photoelectron transfer reactions of highly twisted 1-mesityl- (1a), 1-(2,5-dimethoxyphenyl)- (1b), and 1-(2,3,5,6-tetramethoxyphenyl)- 2,4,6-triphenylpyridinium (1c) tetrafluoroborates in butyronitrile were investigated. The charge-shift states were observed in all cases. Irradiation of 1a generated the charge-shift state (360, 475, and 550 nm), which was converted with a lifetime of 21 ns into the long-lived triplet state (τ = 2.2 μs) localized on the pyridinium moiety. On the other hand, compounds 1b and 1c generated the charge-shift states (λmax = 440 and 540 and λmax = ca. 550 nm as a broad absorption) of short lifetimes, 35 and 16 ps, respectively, decaying exclusively to the singlet ground states.
AB - Primary processes of photoelectron transfer reactions of highly twisted 1-mesityl- (1a), 1-(2,5-dimethoxyphenyl)- (1b), and 1-(2,3,5,6-tetramethoxyphenyl)- 2,4,6-triphenylpyridinium (1c) tetrafluoroborates in butyronitrile were investigated. The charge-shift states were observed in all cases. Irradiation of 1a generated the charge-shift state (360, 475, and 550 nm), which was converted with a lifetime of 21 ns into the long-lived triplet state (τ = 2.2 μs) localized on the pyridinium moiety. On the other hand, compounds 1b and 1c generated the charge-shift states (λmax = 440 and 540 and λmax = ca. 550 nm as a broad absorption) of short lifetimes, 35 and 16 ps, respectively, decaying exclusively to the singlet ground states.
KW - Electron transfer
KW - Photochemistry
KW - Triphenylpyridinium
UR - http://www.scopus.com/inward/record.url?scp=38749149593&partnerID=8YFLogxK
U2 - 10.1016/j.jphotochem.2007.08.019
DO - 10.1016/j.jphotochem.2007.08.019
M3 - 学術論文
AN - SCOPUS:38749149593
SN - 1010-6030
VL - 194
SP - 254
EP - 260
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 2-3
ER -