Thermally Reversible Photochromism of Pyrazole Derivatives

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Author(s)

    • YOKOYAMA Yasushi
    • Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University
    • KURIMOTO Yuko
    • Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University
    • SAITO Yasuyo
    • Mitsubishi Chemical Group, Science and Technology Research Center, Inc.
    • KATSURADA Manabu
    • Mitsubishi Chemical Group, Science and Technology Research Center, Inc.
    • OKADA Itaru
    • Mitsubishi Chemical Group, Science and Technology Research Center, Inc.
    • OSANO Yasuko T.
    • Mitsubishi Chemical Group, Science and Technology Research Center, Inc.
    • SASAKI Chizuko
    • Mitsubishi Chemical Group, Science and Technology Research Center, Inc.
    • YOKOYAMA Yayoi
    • Department of Home Economics, Faculty of Home Economics, Tokyo Kasei Gakuin University
    • ADACHI Masafumi
    • Mitsubishi Chemical Group, Science and Technology Research Center, Inc.
    • MURAYAMA Tetsuo
    • Mitsubishi Chemical Group, Science and Technology Research Center, Inc.
    • HARAZONO Toshie
    • Mitsubishi Chemical Group, Science and Technology Research Center, Inc.

Abstract

Ethyl 4-formyl-1,3-dimethylpyrazole-5-carboxylate showed coloration upon 366-nm light irradiation in the solid state at room temperature. The red color disappeared either by melting or dissolving into solvents. The initiation of coloration is most likely based on a photochemical intramolecular hydrogen abstraction by the formyl oxygen from the methyl group on C-3. It also exhibited coloration in 2-methyltetrahydrofuran matrix at low temperature.

Journal

  • Chemistry Letters

    Chemistry Letters 33(2), 106-107, 2004-02-05

    The Chemical Society of Japan

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Codes

  • NII Article ID (NAID)
    10012042319
  • NII NACSIS-CAT ID (NCID)
    AA00603318
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    03667022
  • Data Source
    CJP  CJPref  J-STAGE 
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