| Photoinduced intramolecular electron transfer between fluorescein and carbazole |
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| 引用本文： | 张宏,张曼华,沈涛. Photoinduced intramolecular electron transfer between fluorescein and carbazole[J]. 中国科学B辑(英文版), 1997, 40(2): 192-198. DOI: 10.1007/BF02876411 |
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| 作者姓名： | 张宏 张曼华 沈涛 |
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| 作者单位： | Institute of Photographic Chemistry，Chinese Academy of Sciences，Beijing 100101，China，Institute of Photographic Chemistry，Chinese Academy of Sciences，Beijing 100101，China，Institute of Photographic Chemistry，Chinese Academy of Sciences，Beijing 100101，China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China |
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| 摘 要： | Several dyads consisting of a fluoreseein covalently linked with a carhazole at site 2 or site 6 have been synthesized and characterized.Studies of absorption spectra,emission spectra and fluorescence lifetime quern hing Indicate that the ground-state interaction between fluorescein and carhazole in dyads is negligible and the intramolecular electron transfer (ET) reactions are mainly of dynamic process.Moreover,the efficiency and raie conslam of lectron transfer reactions in ZFO4 (carbazole linked at site 2'of fluorescein) are larg er than those in 4FOZ (carbazole linked at site 6 of fluorescein) 0 74; KET 11×108S-1),because the mutual orientation of donor and acceptor in ZFO4 is nearly face-to-face,which is more favorable to the process than the shoulder-to-shoulder mutual orientation in 4FOZ.Estimations are also formed of the free energy change of the photomduced electron transfer and the back reactions in the dyads.
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| 收稿时间： | 1996-08-08 |
Photoinduced intramolecular electron transfer between fluorescein and carbazole |
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| Hong Zhang,Manhua Zhang,Tao Shen. Photoinduced intramolecular electron transfer between fluorescein and carbazole[J]. Science in China(Chemistry), 1997, 40(2): 192-198. DOI: 10.1007/BF02876411 |
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| Authors: | Hong Zhang Manhua Zhang Tao Shen |
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| Affiliation: | (1) Institute of Photographic Chemistry, Chinese Academy of Sciences, 100101 Beijing, China |
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| Abstract: | Several dyads consisting of a fluorescein covalently linked with a carbawle at site 2′ or site 6 have been synthesized and characterized. Studies of absorption spectra, emission spectra and fluorescence lifetime quenching indicate that the ground-state interaction between fluorescein and carbazole in dyads is negligible and the intramolecular electron transfer (ET) reactions are mainly of dynamic process. Moreover, the efficiency and rate constant of electron transfer reactions in ZF03 (carbazole linked at site 2′ of fluorescein) (ΦET-D= 0.74;K ET-D = 2.9 X l09 s-1) are larger than those in 4FOZ (carbazole linked at site 6 of fluorescein) (ΦET-D = 0.74;K ET-D = 1.1 X 109 s-1), because the mutual orientation of donor and acceptor in ZF04 is nearly face-to-face, which is more favorable to the ET process than the shoulder-to-shoulder mutual orientation in 4FOZ. Estimations are also formed of the free energy change of the photoinduced electron transfer and the back reactions in the dyads. Project supported by the National Natural Science Foundation of China. |
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| Keywords: | electron transfer Duorescein carhazole |
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