| 光谱学与光谱分析 |
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| Study on Supramolecular Complexes of Cyclodextrins and Fenoxaprop-p-Ethyl by UV Spectra |
| ZHANG An-ping1, LUO Fan1, LIU Wei-ping2* |
1. Institute of Environmental Science, Zhejiang University, Hangzhou 310029，China
2. Research Center of Green Chirality, College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China |
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Abstract The supramolecular complexes of fenoxaprop-p-ethyl and various cyclodextrins (β-CD, HP-β-CD, RAMEB) were studied by UV spectra technique. The results showed that all cyclodextrins could form 1∶1 inclusion complexes with fenoxaprop-p-ethyl in ethanol-water (the volume ratio of ethanol to water was 1∶4), and the binding constants of the three types of cyclodextrins toward fenoxaprop-p-ethyl were in the order of KRAMEB>>KHP-β-CD＞Kβ-CD. Between 298.15 and 318.15 K, the binding constants decreased with temperature increasing. The Gibbs free energy ΔG, enthalpy change ΔH, and entropy change ΔS determined were all negative, suggesting that the inclusion complexation is exothermic and can spontaneously occur by the balance of enthalpy driving and entropy opposing.
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Received: 2005-09-08
Accepted: 2005-11-28
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Corresponding Authors:
LIU Wei-ping
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| Cite this article: |
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ZHANG An-ping,LUO Fan,LIU Wei-ping. Study on Supramolecular Complexes of Cyclodextrins and Fenoxaprop-p-Ethyl by UV Spectra [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2006, 26(12): 2298-2301.
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| URL: |
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https://www.gpxygpfx.com/EN/Y2006/V26/I12/2298 |
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