| Photoinduced intramolecular electron transfer of fluorescein and violgen, carbazole |
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| 引用本文： | 张宏,张曼华,沈涛. Photoinduced intramolecular electron transfer of fluorescein and violgen, carbazole[J]. 中国科学B辑(英文版), 1997, 40(5): 449-456. DOI: 10.1007/BF02875412 |
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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 (No. 59333072) |
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| 摘 要： | A series of polyads consisting of covalently-(CH2)4-linked fluorescein with carbazole and violger.Live been synthesized and characterized The studies of absorption,emission spectra and fluorescence lifetime quenching indicated that the intramolecular fluorescence quenching of fluorescein by violgen is mainly a static process through the formation of non emission complex (fluorescence quenching efficiency φQ=0.97,lifetime quenching efficiency φH 0,quenching efficiency of formation of non-emission complex φC=0.97); while the quenching by carbazole is mainly a dynamic electron transfer process (φQ=0.63,φET=0.63,φC=0).In the violgen-fluorescein-carbazole triads,φQ=0.97,Q ET=0.65,φC=0.32,which suggests that the photoinduced interaction of fluorescein-carbazole pair and that of violgen-fluorescein pair are in a competitive process,the dynamic electron transfer from carbazole to fluorecein is dominant in the process The free energy change of the photoinduced electron transfer and the back reac-tiorns i
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| 收稿时间： | 1996-11-14 |
Photoinduced intramolecular electron transfer of fluorescein and violgen, carbazole |
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| Hong Zhang,Manhua Zhang,Tao Shen. Photoinduced intramolecular electron transfer of fluorescein and violgen, carbazole[J]. Science in China(Chemistry), 1997, 40(5): 449-456. DOI: 10.1007/BF02875412 |
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| Authors: | Hong Zhang Manhua Zhang Tao Shen |
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| Affiliation: | (1) Chinese Academy of Sciences, Institute of Photographic Chemistry, 100101 Beijing, China |
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| Abstract: | A series of polyads consisting of covalently —(CH2)4— linked fluorescein with carbazole and violgen have been synthesized and characterized. The studies of absorption, emission spectra and fluorescence lifetime quenching indicated that the intramolecular fluorescence quenching of fluorescein by violgen is mainly a static process through the formation of non-emission complex (fluorescence quenching efficiency ϕ q = 0. 97, lifetime quenching efficiency ϕET = 0, quenching efficiency of formation of non-emission complex ϕc = 0.97); while the quenching by carbazole is mainly a dynamic electron transfer process (ϕQ = 0. 63, ϕET = 0.63, ϕc = 0). In the violgen-fluorescein-carbazole triads, ϕQ = 0.97, ϕET = 0.65, ϕc = 0.32, which suggests that the photoinduced interaction of fluorescein-carbazole pair and that of violgen-fluorescein pair are in a competitive process, the dynamic electron transfer from carbazole to fluorecein is dominant in the process. The free energy change of the photoinduced electron transfer and the back reactions in our polyads are also estimated. Project supported by the National Natural Science Foundation of China (No. 59333072) |
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| Keywords: | intramolecular electron transfer fluorescein violgcn carbazole |
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