物理化学学报 >> 1998, Vol. 14 >> Issue (11): 995-1000.doi: 10.3866/PKU.WHXB19981107

研究论文 上一篇    下一篇

一类新型荧光化学敏感器形成激基缔合物的温度效应

李华平, 汪鹏飞, 吴世康   

  1. 中国科学院感光化学研究所,北京 100101
  • 收稿日期:1998-02-23 修回日期:1998-04-30 发布日期:1998-11-15
  • 通讯作者: 吴世康

Temperature Dependence of Excimer Formation of a New Kind of Fluorescence Chemosensor

Li Hua-Ping, Wang Peng-Fei, Wu Shi-Kang   

  1. Institute of Photographic Chemistry,Chinese Academy of Sciences,Beijing 100101
  • Received:1998-02-23 Revised:1998-04-30 Published:1998-11-15
  • Contact: Wu Shi-Kang

摘要:

对一类具有分子识别功能的荧光分子敏感器化合物,在水溶液中形成的分子内激基缔合物的温度效应进行研究.进而提出该类化合物在水溶液中进行分子内单体和分子内激基缔合物转化的机制.通过分析所得的热力学数据,同文献值相比较,推导出该类化合物在水溶液中可能存在的几何构型.为该类化合物在作为探针应用时提供理论依据.

关键词: 激基缔合物, 温度效应, 几何构型, 排斥能

Abstract:

The monomer and excimer fluorescence bands recorded in aqueous solution of a new kind of fluorescence chemosensor which have the ability of recognition exhibit an "isosbestic" point over certain limited ranges of temperatures. The temperature dependence of their excimer formation was studied. The mechanism of the transformation between monomer and excimer and the excimer geometrical configuration have been proposed. From the temperature conefficient of the ratio of excimer to monomer fluorescence intensities at the isosbestic wavelength the value of enthalpy and entropy in the process of transformation can be estimated. The repulsive energy between unexcited molecule in the excimer configuration contributes to the excimer formation of these fluorescence chemosensor. These results provide a base for their applications.

Key words: Excimer, Temperature dependence, Geometrical configuration, Repulsive energy