物理化学学报 >> 1995, Vol. 11 >> Issue (06): 558-563.doi: 10.3866/PKU.WHXB19950616

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结构受阻对取代苯乙烯基吡嗪光物理行为的影响

李泽敏,吴世康   

  1. 中国科学院感光化学研究所|北京 100101
  • 收稿日期:1994-07-07 修回日期:1994-09-02 发布日期:1995-06-15
  • 通讯作者: 吴世康

The Effect of Steric Hindrance on the Photophysical Behavior of Substituted Styryl Pyrazine Derivatives

Li Ze-Min,Wu Shi-Kang   

  1. Institute of Photographic Chemistry,Academia Sinica,Beijing 100101
  • Received:1994-07-07 Revised:1994-09-02 Published:1995-06-15
  • Contact: Wu Shi-Kang

关键词: 苯乙烯基吡嗪, 结构受阻, 分子内旋转, 分子内电荷转移

Abstract:

Six styryl pyrazine compounds, in which some are streically hindered rotation and some are freely rotated, have been sythesized in this work. The effects of temperature and solvent polarity on the photophysics and luminescence behavior of these compounds were studied in detail. Results indicated that blocking of the double bond twist by a sufficiently rigid bridge increases fluorescence quantum yields dramatically and the single bond connecting the double bond twisted is favorable to the formation of T* state (radiation decay). One of the resons for distytyl pyrazines having higher fluorescence quantum yields may be due to the less probability of transformation from E* state to P* state.

Key words: Styryl pyrazine, Steric hindrance, Intramolecular rotation, Intramolecular charge transfer