| Photochromism of cis(z)-1,2-bispyrryl-substituted ethene derivatives |
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| 作者姓名： | 樊贵宝 明阳福 樊美公 姚思德 左志华 |
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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，Laboratory of Radiation Chemistry，Shanghai Institute of Nuclear Research，Chinese Academy of Sciences，Shanghai 201800，China，Laboratory of Radiation Chemistry，Shanghai Institute of Nuclear Research，Chinese Academy of Sciences，Shanghai 201800，China |
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| 基金项目： | Project supported by the Chinese Academy of Sciences，the National Natural Science Foundation of China |
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| 摘 要： | Photochromism of two bispyrryl-substituted ethenes, 2, 3-bis-(1-p-methoxyphenyl-5-phenyl-2-methyl-3-pyrryl)-2-butene (BPE1) and 2,3-bis(1-p-bromophenyl-4-phenyl-2-methyl-3-pyrryl)-2-butene (BPE2), was studied by laser flash photolysis technique. The results indicate that photocyclization of these compounds proceeds mainly via the excited triplet state, and the cis-trans isomerization proceeds mainly via the excited singlet state. After UV laser pulse irradiation, both photocylization and cis-trans isomerization of BPEl occur, but photocydization is the main reaction. On the other hand, laser photolysis of BPE2 leads mainly to photocydization. The effects of the substituents on the photochromic mechanism are also discussed.
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Photochromism of cis(z)-1,2-bispyrryl-substituted ethene derivatives |
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| FAN Guibao MING Yangfu FAN Meigong.Photochromism of cis(z)-1,2-bispyrryl-substituted ethene derivatives[J].Science in China(Chemistry),1996(4). |
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| Authors: | FAN Guibao MING Yangfu FAN Meigong |
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| Abstract: | Photochromism of two bispyrryl-substituted ethenes, 2, 3-bis-(1-p-methoxyphenyl-5-phenyl-2-methyl-3-pyrryl)-2-butene (BPE1) and 2,3-bis(1-p-bromophenyl-4-phenyl-2-methyl-3-pyrryl)-2-butene (BPE2), was studied by laser flash photolysis technique. The results indicate that photocyclization of these compounds proceeds mainly via the excited triplet state, and the cis-trans isomerization proceeds mainly via the excited singlet state. After UV laser pulse irradiation, both photocylization and cis-trans isomerization of BPEl occur, but photocydization is the main reaction. On the other hand, laser photolysis of BPE2 leads mainly to photocydization. The effects of the substituents on the photochromic mechanism are also discussed. |
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| Keywords: | bispyrryl-substituted ethene photochromic mechanism photocyclization cis-trans isomerization |
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