化学学报 ›› 2002, Vol. 60 ›› Issue (9): 1581-1585. 上一篇    下一篇

研究论文

荧光素衍生物在TiO_2胶体中的光物理性质研究

张海平;周亚琳;张曼华;沈涛;李玉良;朱道本   

  1. 中国科学院化学研究所分子科学中心.北京(100080)
  • 出版日期:2002-09-15 发布日期:2002-09-15

Photophysical Properties of Fluorescein Derivatives on TiO_2 Colloid

Zhang Haiping;Zhou Yalin;Zhang Manhua;Shen Tao;Li Yuliang;Zhu Daoben   

  1. Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences.Beijing(100080)
  • Online:2002-09-15 Published:2002-09-15

测定了以荧光素为光敏剂的电子给体-受体二元化合物荧光素蒽醌甲酯(FL- AQ)及模型化合物荧光素丁酯(FL4)在溶液中和在二氧化钛(TiO_2)胶体中的吸 收光谱、荧光光谱、荧光寿命等。发现荧光素蒽醌甲酯与荧光素丁酯均可通过酚羟 基较好地吸附在TiO_2胶体上。从吸收光谱可得,FL4与TiO_2形成表面络合物的表 观结合常数(K_(app))大约为3590 mol~(-1)·L,结合率(α)为0.86;FL-AQ与 TiO_2形成表面络合物的K_(app)大约为3060 mol~(-1)·L,α为0.84。同时通过 ESR光谱讨论了光诱导电子注入机制。

关键词: 荧光素, 二氧化钛, 胶体, 电子自旋共振, 光诱导

The interactions of the model compound (FL4) or diad (FL-AQ) composed of fluorescein and 2-methyl-anthraquinone and TiO_2 colloid have been examined by absorption, fluorescence spectroscopy and fluorescence lifetime. This diad (FL-AQ) or model compound (FL4) is adsorbed on TiO_2 colloid through the phenolic function of the fluorescein moiety. The apparent association constant (K_(app)) of FL4/TiO_2 obtained from the absorption spectra is ca. 3590 mol~(-1)·L. The K_(app) of FL-AQ/TiO_2 is ca. 3060 mol~(-1)·L. The degree of association (α) between TiO_2 and FL4 is ca. 0.86. The degree of association (α) between TiO_2 and FL-AQ is ca. 0.84. The mechanism of the photoinduced electron injection was also discussed through ESR spectra.

Key words: LUCIFERIN, TITANIUM DIOXIDE, COLLOID, ESR, PHOTOINDUCED

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