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The Effect of Pre-solvation in the Ground State on Photoinduced Electron Transfer in Ionic Liquids

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Abstract

Photoinduced intramolecular charge transfer (CT) dynamics of the asymmetric and symmetric molecules, 4-(9-anthryl)-N,N-dimethylaniline (ADMA) and 9,9′-bianthryl (BA), was investigated by means of time-resolved fluorescence (TRF) spectroscopy and compared with the solvation dynamics of coumarin 153 (C153) in several ionic liquids (ILs). The normalized dynamic Stokes shift (DSS) function for the CT state emission of ADMA in the sub-ns to ns time scale is almost the same as those of BA and C153 in most of the ILs studied, in spite of the much larger Stokes shift of ADMA compared to those of BA and C153. On the other hand, the contribution from ultrafast DSS within 30 ps, which was undetectable with the time resolution in the present study, was estimated to be smaller for BA than that for ADMA. Meanwhile, in phosphonium IL, the DSS in sub-ns to ns time range was solute dependent. This peculiarity in phosphonium IL is discussed from the viewpoint of the hierarchy of the solvation dynamics.

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Acknowledgments

This work was supported by a Grant-in-Aid for Scientific Research (23245004) to HM from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. TK and YN were supported by Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST). MM was supported by the fellowship (DC2) from Japan Society for the Promotion of Science (JSPS).

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Authors and Affiliations

  1. Division of Frontier Materials Science, Graduate School of Engineering Science, Center for Quantum Science and Technology under Extreme Conditions, Osaka University, Toyonaka, Osaka, 560-8531, Japan

    Masayasu Muramatsu, Satoe Morishima, Tetsuro Katayama, Syoji Ito, Yutaka Nagasawa & Hiroshi Miyasaka

  2. PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama, 332-0012, Japan

    Tetsuro Katayama & Yutaka Nagasawa

Authors
  1. Masayasu Muramatsu
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  2. Satoe Morishima
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  3. Tetsuro Katayama
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  4. Syoji Ito
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  5. Yutaka Nagasawa
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  6. Hiroshi Miyasaka
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Correspondence to Yutaka Nagasawa or Hiroshi Miyasaka.

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Muramatsu, M., Morishima, S., Katayama, T. et al. The Effect of Pre-solvation in the Ground State on Photoinduced Electron Transfer in Ionic Liquids. J Solution Chem 43, 1550–1560 (2014). https://doi.org/10.1007/s10953-014-0227-7

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  • DOI: https://doi.org/10.1007/s10953-014-0227-7

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