Photoinduced electron-transfer reactions and magnetic field effects on the decay rates of a photogenerated biradical from zinc porphyrin-viologen linked compounds in an ionic liquid

Hironobu Tahara; Hiroaki Yonemura; Satoko Harada; Akio Nakashima; Sunao Yamada

doi:10.1016/j.cplett.2011.12.037

Photoinduced electron-transfer reactions and magnetic field effects on the decay rates of a photogenerated biradical from zinc porphyrin-viologen linked compounds in an ionic liquid

Hironobu Tahara, Hiroaki Yonemura, Satoko Harada, Akio Nakashima, Sunao Yamada

Materials Science and Engineering, School of Engineering

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

9 Citations (Scopus)

Abstract

Fluorescence and transient absorption spectra of zinc-porphyrin (ZnP)-viologen linked compounds with various methylene groups indicate that intramolecular electron-transfer from the singlet or triplet excited state of ZnP to viologen occurred and a biradical was generated in the ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate) at various temperatures (283-343 K). The decay rate constants of the biradical decreased in 0-0.2∼0.5 T and became constant in 0.2∼0.5-1 T. Unique effects of temperature and methylene chain length on electron-transfer and magnetic field effects were observed and are probably due to the properties of the ionic liquid as compared with benzonitrile.

Original language	English
Pages (from-to)	42-48
Number of pages	7
Journal	Chemical Physics Letters
Volume	524
DOIs	https://doi.org/10.1016/j.cplett.2011.12.037
Publication status	Published - Feb 6 2012

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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Photoinduced electron-transfer reactions and magnetic field effects on the decay rates of a photogenerated biradical from zinc porphyrin-viologen linked compounds in an ionic liquid. / Tahara, Hironobu; Yonemura, Hiroaki; Harada, Satoko; Nakashima, Akio; Yamada, Sunao.

In: Chemical Physics Letters, Vol. 524, 06.02.2012, p. 42-48.

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

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abstract = "Fluorescence and transient absorption spectra of zinc-porphyrin (ZnP)-viologen linked compounds with various methylene groups indicate that intramolecular electron-transfer from the singlet or triplet excited state of ZnP to viologen occurred and a biradical was generated in the ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate) at various temperatures (283-343 K). The decay rate constants of the biradical decreased in 0-0.2∼0.5 T and became constant in 0.2∼0.5-1 T. Unique effects of temperature and methylene chain length on electron-transfer and magnetic field effects were observed and are probably due to the properties of the ionic liquid as compared with benzonitrile.",

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AU - Nakashima, Akio

AU - Yamada, Sunao

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