Different Photochromic Rates of Azopyridine Derivatives in New Dual Photoisomeric Cobaloxime Complex Crystals

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Author(s)

    • Sekine Akiko SEKINE Akiko
    • Department of Chemistry and Materials Science, Graduate School of Science and Engineering, Tokyo Institute of Technology

Abstract

Two cobaloxime complexes, namely (3-cyanopropyl)(3-phenylazopyridine)cobaloxime and (3-cyanopropyl)(4-phenylazopyridine)cobaloxime, were synthesized as new dual photoisomeric complexes for controlling the reactivity of <i>trans</i>–<i>cis</i> photoisomerization of phenylazopyridine derivatives in the solid state. The phenylazopyridine moieties of the crystals were transformed from the <i>trans</i> to the <i>cis</i>-form on exposure to UV light. In contrast, the 3-cyanopropyl groups of the crystals were isomerized to 1-cyanopropyl groups on irradiation with visible light. Moreover, the 3–1 photoisomerization of the 3-cyanopropyl group occurred with retention of the single-crystal form. The rates of the <i>trans</i>–<i>cis</i> transformations of the phenylazopyridine moieties of the crystals before the 3–1 phototransformation were compared with those after the phototransformation in the solid state. For the two crystals, the rates of the <i>trans</i>–<i>cis</i> phototransformations significantly increased after 3–1 photoisomerization. The crystal structures before and after 3–1 photoisomerization were analyzed. The free space around the phenylazopyridine moieties expanded as a result of 3–1 photoisomerization. It is clear that the reaction rates of the <i>trans</i>–<i>cis</i> transformations of the phenylazopyridine moieties on exposure to UV light can be modified by introducing another photoreactive group that is photoisomerized by visible light.

Journal

  • Bulletin of the Chemical Society of Japan

    Bulletin of the Chemical Society of Japan 86(9), 1028-1034, 2013-09-15

    The Chemical Society of Japan

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Codes

  • NII Article ID (NAID)
    10031194296
  • NII NACSIS-CAT ID (NCID)
    AA00580132
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00092673
  • NDL Article ID
    024830529
  • NDL Call No.
    Z53-B35
  • Data Source
    CJP  NDL  J-STAGE 
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