| 伞形酮在不同溶剂中的荧光光谱及其二聚作用 |
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| 引用本文： | 李隆弟,杨世忠.伞形酮在不同溶剂中的荧光光谱及其二聚作用[J].光谱学与光谱分析,1996,16(2):95-99. |
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| 作者姓名： | 李隆弟 杨世忠 |
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| 作者单位： | 清华大学化学系，新疆八一农学院食品科学系 |
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| 基金项目： | 国家自然科学基金,北京市自然科学基金 |
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| 摘 要： | 对比研究了数种溶剂中不同浓度伞形酮溶液的荧光光谱，发现其峰形和峰位不仅随溶剂而变，且随浓度而变，据此对其发光机理进行了讨论，认为在高浓度伞形酮溶液中存在着地聚现象。二聚体的形成可以借助于与溶剂间的氢键或者单体分子间的氢键作用力来实现，浓度愈高，溶剂形成氢键的能力愈强，愈有利于二聚体的形成，二聚体激发态ＮＮ和单体激发态Ｎ都是比基态Ｎ强得多的酸。
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| 关 键 词： | 伞形酮 荧光光谱 二聚作用 羟基香豆素 |
FLUORESCENCE SPECTRA OF UMBELLIFERONE IN VARIOUS SOLUTIONS AND ITS DIMERISATION |
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| LI Longdi and ZHANG Deqiang.FLUORESCENCE SPECTRA OF UMBELLIFERONE IN VARIOUS SOLUTIONS AND ITS DIMERISATION[J].Spectroscopy and Spectral Analysis,1996,16(2):95-99. |
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| Authors: | LI Longdi and ZHANG Deqiang |
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| Abstract: | The fluorescence spectra of umbelliferone (7-hydroxycoumarin) solutions at different concentrations in various solvents are compared and studied. It is found that the peak shape and peak wavelength change not only with the solvent but also with the concentration.The luminescence processes are discussed based on the experimental resultS. To our thinking there are dimerisation phenomena in the umbelliferone solutions at high concentration. The formation of dimer NN and NN may be caused by the aid of hydrogen bonding between umbelliferone and solvent or between umbelliferone molecule themselves. The excited state NN and N. are two much stronger acid than the ground state molecule N. |
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| Keywords: | Urnbelliferone Fluorescence spectrum Dimerisation |
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