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Photoinduced Electron Transfer in 9-Substituted 10-Methylacridinium Ions

Title
Photoinduced Electron Transfer in 9-Substituted 10-Methylacridinium Ions
Authors
Tsudaka, TakeshiKotani, HiroakiOhkubo, KeiNakagawa, TatsuoTkachenko, Nikolai V.Lemmetyinen, HelgeFukuzumi, Shunichi
Ewha Authors
Shunichi Fukuzumi
SCOPUS Author ID
Shunichi Fukuzumiscopus
Issue Date
2017
Journal Title
CHEMISTRY-A EUROPEAN JOURNAL
ISSN
0947-6539JCR Link1521-3765JCR Link
Citation
vol. 23, no. 6, pp. 1306 - 1317
Publisher
WILEY-V C H VERLAG GMBH
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A series of 9-substituted 10-methylacridinium ions (Acr(+)-R) in which an electron-donor moiety (R) is directly linked with an electron-acceptor moiety (Acr(+)) at the 9-position was synthesized, and the photodynamics was fully investigated to determine the rate constants of photoinduced electron transfer (ET) and back electron transfer. The driving forces of photoinduced electron transfer and back electron transfer were determined by means of electrochemical and photophysical measurements. The dependence of the ET rate constants on driving force was well analyzed in the light of the Marcus theory of ET. The quantum yields of for-mation of the triplet ET states vary significantly, depending on the interaction between the donor (R) and acceptor (Acr(+)) moieties. Among the Acr(+)-R examined, the 9-mesityl10- methylacridinium ion (Acr(+)-Mes) exhibits the best performance in terms of the lifetime of the triplet ET state and the quantum yield. Photoexcitation of Acr(+)-Mes results in formation of the triplet ET state [3(AcrC-MesC(+))], which has a long lifetime, a high energy (2.37 eV), and a high quantum yield (> 75%) in acetonitrile. The triplet ET state exhibits both the oxidizing and reducing activity of the MesC(+) and AcrC moieties, respectively.
DOI
10.1002/chem.201604527
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자연과학대학 > 화학·나노과학전공 > Journal papers
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