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《Acta Chimica Sinica》 1998-05
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Investigation of Photochemical Behavior of a Squaraine Dye Photosensitizing Titanium Dioxide Ultrafine Particles

WANG Chuan - Yi LIU Chun - Yan SHEN Tao(Institute of Photographic Chemistry, The Chinese Academy of Sciences , Beijing, 100101)  
Photochemical behavior of 2 - (4 - ethylamino - 2 - hydroxyphenyl) - 4 - (4 -ethylaminophenyl) - squaraine (SQ) in TiO2 system was probed by UV - vis, fluorescence quenching, and nanosecond time - correlated single - photon counting. There was strong interaction between SQ and TiO2 colloidal particles with an apparent association constant of 2. 275×103mol-1·dm3 obtained by the fluorescence quenching data. The fluorescence emission of SQ dye could be quenched by TiO2 colloid with an efficiency of 97 % . The mechanism of photoinduced interface electron transfer for the fluorescence quenching was proposed upon the spectral characters, potential discrepancy and the variation of the fluorescence lifetime. The rate constantfor the electron injection process was 1. 97 × 108 s-1 determined from the measurements of fluorescence lifetimes.
【Fund】: 国家自然科学基金(29573141);; 中国科学院感光化学研究所光化学开放实验室和美国柯达公司的资助
【CateGory Index】: O644
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