Photoisomerization of azobenzocrown ethers. Effect of complexation of alkaline earth metal ions

Ruriko Tahara, Tatsuya Morozumi, Hiroshi Nakamura, Masatsugu Shimomura

    Research output: Contribution to journalArticlepeer-review

    45 Citations (Scopus)

    Abstract

    The effects of complexed metal ions on trans-cis photoisomerization reactions of two azobenzene compounds having a crown ether ring, 1a (small ring) and 1b (large ring) were investigated. The photoisomerization of 2,2′-dimethoxyazobenzene (2) was compared as a control. Anomalous increase in the quantum yields of the photoisomerization of 1a and 1b were observed by complexation with alkaline earth metal ions in both cases of photo irradiation at n→π* and π→π* absorption bands, except for some cases. These increase was attributed to the interaction between coordinated metal ions and oxygen atoms on 2,2′-position and/or nitrogen atoms of the azobenzene moiety. The dependence of the quantum yields on the ring size of the crown ether was also discussed.

    Original languageEnglish
    Pages (from-to)7736-7743
    Number of pages8
    JournalJournal of Physical Chemistry B
    Volume101
    Issue number39
    Publication statusPublished - 1997 Sep 25

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films
    • Materials Chemistry

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