| 光谱学与光谱分析 |
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| UV Spectroscopic Characterization of the Inclusion Interaction of β-Cyclodextrin and Sym-Diphenyl-Thiourea and Sym-Diphenyl-Urea |
| YAO Hong, WEI Tai-bao, XU Wei-xia, ZHANG You-ming* |
| College of Chemistry and Chemical Engineering, Gansu Key Laboratory of Polymer Materials, Northwest Normal University, Lanzhou 730070, China |
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Abstract The inclusion interaction of β-cyclodextrin and sym-diphenyl-thiourea and sym-diphenyl-urea was studied by UV spectra. The stoichiometry ratio for the formation of the inclusion complexes was determined by Hildebrand-Benesi equation linear analysis and molar ratio method. The standard molar Gibbs energies, enthalpies, and entropies were derived for the inclusion process by Ks at different temperatrues. The result showed that the host:guest ratio of inclusion complex between the two diphenyl compounds and β-CD is 2∶1, the stability constant(Ks) of 2∶1 inclusion complexes was higher than that of 1∶1 inclusion complexes due to cooperative binding in the close two hydrophobic cyclodextrin cavities, and the association of the guest molecule with β-CD was favored by enthalpy changes, proving that the Van der Waals interaction and the dipole-dipole interaction were main binding forces of cyclodextrin inclusion complex.
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Received: 2005-02-16
Accepted: 2005-06-08
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Corresponding Authors:
ZHANG You-ming
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| Cite this article: |
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YAO Hong,WEI Tai-bao,XU Wei-xia, et al. UV Spectroscopic Characterization of the Inclusion Interaction of β-Cyclodextrin and Sym-Diphenyl-Thiourea and Sym-Diphenyl-Urea[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2006, 26(09): 1664-1667.
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https://www.gpxygpfx.com/EN/Y2006/V26/I09/1664 |
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