| Studies on the interactions of 2,5-diphenyl 1,3,4-oxadiazole and 2,5-diphenyl 1,3-oxazole with β-cyclodextrin |
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| 作者姓名： | ZHANG Chunfen SHEN Xinghai GAO Hongcheng |
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| 作者单位： | Institute of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China,Institute of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China,Institute of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (Grant No. 29901001) |
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| 摘 要： | Interactions of 2,5-diphenyl 1,3,4-oxadiazole (PPD) and 2,5-diphenyl 1,3-oxazole (PPO) with β-cyclodextrin (β-CD) are studied by 1H-NMR and steady-state fluorescence measurements, and the stoichiometries and the association constants are estimated. It is found that the hydrophobic interaction is the main driving force for the formation of inclusion complexes of PPD and PPO with β-CD. In the presence of aliphatic alcohols (from 1-propanol to 1-pentanol), PPD and PPO transfer from the CD cavity to the aqueous phase. Quenching experiments of PPD and PPO by iodide further prove the above conclusions. The results suggest that stereo effect is the crucial factor to the inexistence of nanotube in PPD (or PPO)-β-CD systems.
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| 关 键 词： | 1H-NMR steady-state fluorescence fluorescence anisotropy β-cyclodextrin |
Studies on the interactions of 2,5-diphenyl 1,3,4-oxadiazole and 2,5-diphenyl 1,3-oxazole with β-cyclodextrin |
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| ZHANG Chunfen,SHEN Xinghai,GAO Hongcheng.Studies on the interactions of 2,5-diphenyl 1,3,4-oxadiazole and 2,5-diphenyl 1,3-oxazole with β-cyclodextrin[J].Progress in Natural Science,2002,12(5):342-346. |
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| Authors: | ZHANG Chunfen SHEN Xinghai GAO Hongcheng |
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| Institution: | Institute of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China |
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| Abstract: | Interactions of 2,5-diphenyl 1,3,4-oxadiazole (PPD) and 2,5-diphenyl 1,3-oxazole (PPO) with β-cyclodextrin (β-CD) are studied by 1H-NMR and steady-state fluorescence measurements, and the stoichiometries and the association constants are estimated. It is found that the hydrophobic interaction is the main driving force for the formation of inclusion complexes of PPD and PPO with β-CD. In the presence of aliphatic alcohols (from 1-propanol to 1-pentanol), PPD and PPO transfer from the CD cavity to the aqueous phase. Quenching experiments of PPD and PPO by iodide further prove the above conclusions. The results suggest that stereo effect is the crucial factor to the inexistence of nanotube in PPD (or PPO)-β-CD systems. |
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| Keywords: | 1H-NMR steady-state fluorescence fluorescence anisotropy |
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