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

    Research output: Contribution to journalArticlepeer-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 languageEnglish
    Pages (from-to)42-48
    Number of pages7
    JournalChemical Physics Letters
    Volume524
    DOIs
    Publication statusPublished - Feb 6 2012

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)
    • Physical and Theoretical Chemistry

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