| 光谱学与光谱分析 |
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| Study on the Mechanism of Energy Transfer between Fluorescein Sodium and Tetrabromofluorescein Sodium in Micelles of Cationic Surface Active Agent |
| LIU Bao-sheng,ZHANG Yan-qing,WANG Yun-ke, Lǖ Yun-kai |
| Center of Physics and Chemistry, Hebei University, Baoding 071002, China |
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Abstract In the present paper, the fluorescence reaction of cationic surface-active agents (CSAA) with Tetrabromofluorescein sodium (TBF) in aqueous solution was investigated. It was found that the fluorescence quenching of TBF appears when it reacts with the cation monomer of a CSAA and a new stronger fluorescence is obtained when the ion-associates react with the micellate of CSAA. The authors investigated the condition of energy transfer between acidic fluorescent dyes in micelles of cetyl trimethyl ammonium bromide or hexadecyl pyridinium bromide. It was indicated that in the micelles formed by cationic surface active agent with dyes embedded (cationic surface active agent and dyes are charge opposite), the effective energy transfer between anionic dyes could occur. When the concentration of cationic surface active agent reached certain value, the energy transfer could occur. With the value of two thirds of critical micelle concentration, the efficiency of energy transfer reached the maximum; when the concentration of cationic surface active agent increased, the efficiency of energy transfer would be decreased. The authors also deduced the model of energy transfer between dyes in micelles and laws of it.
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Received: 2007-02-26
Accepted: 2007-05-28
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Corresponding Authors:
LIU Bao-sheng
E-mail: lbs@mail.hbu.edu.cn
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