Photoinduced electron transfer reactions of highly twisted 1-donor-substituted 2,4,6-triphenylpyridinium cations

Takashi Namikawa; Masato Kuratsu; Masatoshi Kozaki; Toshio Matsushita; Akio Ichimura; Keiji Okada; Akio Yoshimura; Noriaki Ikeda; Koichi Nozaki

doi:10.1016/j.jphotochem.2007.08.019

Photoinduced electron transfer reactions of highly twisted 1-donor-substituted 2,4,6-triphenylpyridinium cations

Takashi Namikawa, Masato Kuratsu, Masatoshi Kozaki, Toshio Matsushita, Akio Ichimura, Keiji Okada^*, Akio Yoshimura, Noriaki Ikeda, Koichi Nozaki

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

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 (λ_max = 440 and 540 and λ_max = ca. 550 nm as a broad absorption) of short lifetimes, 35 and 16 ps, respectively, decaying exclusively to the singlet ground states.

Original language	English
Pages (from-to)	254-260
Number of pages	7
Journal	Journal of Photochemistry and Photobiology A: Chemistry
Volume	194
Issue number	2-3
DOIs	https://doi.org/10.1016/j.jphotochem.2007.08.019
State	Published - 2008/02/20

Keywords

Electron transfer
Photochemistry
Triphenylpyridinium

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Physics and Astronomy

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10.1016/j.jphotochem.2007.08.019

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@article{04e7fc53cddd4a5b9861587f92ac62d6,

title = "Photoinduced electron transfer reactions of highly twisted 1-donor-substituted 2,4,6-triphenylpyridinium cations",

abstract = "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.",

keywords = "Electron transfer, Photochemistry, Triphenylpyridinium",

author = "Takashi Namikawa and Masato Kuratsu and Masatoshi Kozaki and Toshio Matsushita and Akio Ichimura and Keiji Okada and Akio Yoshimura and Noriaki Ikeda and Koichi Nozaki",

note = "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 ",

year = "2008",

month = feb,

day = "20",

doi = "10.1016/j.jphotochem.2007.08.019",

language = "英語",

volume = "194",

pages = "254--260",

journal = "Journal of Photochemistry and Photobiology A: Chemistry",

issn = "1010-6030",

publisher = "Elsevier B.V.",

number = "2-3",

}

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

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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 -

Photoinduced electron transfer reactions of highly twisted 1-donor-substituted 2,4,6-triphenylpyridinium cations

Abstract

Keywords

ASJC Scopus subject areas

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