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荧光素衍生物在TiO_2胶体中的光物理性质研究
引用本文:张海平,周亚琳,张曼华,沈涛,李玉良,朱道本. 荧光素衍生物在TiO_2胶体中的光物理性质研究[J]. 化学学报, 2002, 60(9): 1581-1585
作者姓名:张海平  周亚琳  张曼华  沈涛  李玉良  朱道本
作者单位:中国科学院化学研究所分子科学中心.北京(100080)
基金项目:国家自然科学基金 (No .5 0 0 730 2 5 )资助项目
摘    要: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  
修稿时间:2001-12-31

Photophysical Properties of Fluorescein Derivatives on TiO_2 Colloid
ZHANG,Hai-Ping ZHOU,Ya-Lin ZHANG,Man-Hua SHEN,Tao LI,Yu-Liang ZHU,Dao-Ben. Photophysical Properties of Fluorescein Derivatives on TiO_2 Colloid[J]. Acta Chimica Sinica, 2002, 60(9): 1581-1585
Authors:ZHANG  Hai-Ping ZHOU  Ya-Lin ZHANG  Man-Hua SHEN  Tao LI  Yu-Liang ZHU  Dao-Ben
Affiliation:Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences.Beijing(100080)
Abstract: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.
Keywords:fluorescein derivatives   TiO 2 colloid   photoinduced electron injection   ESR spectra  
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