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

Autor:	Akio Ichimura, Toshio Matsushita, Masatoshi Kozaki, Keiji Okada, Noriaki Ikeda, Akio Yoshimura, Masato Kuratsu, Koichi Nozaki, Takashi Namikawa
Rok vydání:	2008
Předmět:	Chemistry General Chemical Engineering General Physics and Astronomy General Chemistry Photochemistry Photoinduced electron transfer Electron transfer chemistry.chemical_compound Butyronitrile Moiety Singlet state Pyridinium Absorption (chemistry) Triplet state
Zdroj:	Journal of Photochemistry and Photobiology A: Chemistry. 194:254-260
ISSN:	1010-6030
DOI:	10.1016/j.jphotochem.2007.08.019
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::137a61786a6530a721e587129fe5e3a9 https://doi.org/10.1016/j.jphotochem.2007.08.019 Zobrazit plný text záznamu Full Text from ScienceDirect