Preparation and characterization of inclusion complexes of beta-cyclodextrin with ionic liquid |
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Authors: | Gao Yan-An Li Zhong-Hao Du Ji-Min Han Bu-Xing Li Gan-Zuo Hou Wan-Guo Shen Dong Zheng Li-Qiang Zhang Gao-Yong |
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Affiliation: | Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China. |
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Abstract: | The solubilities of beta-cyclodextrin (beta-CD), ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF6), and their mixture in water were determined, and the conductivity of these aqueous solutions was measured. It was demonstrated that beta-CD and bmimPF6 could enhance the solubility of each other, and the solubility curves of each were linear with gradients of about 1. The conductivity decreased remarkably with increasing beta-CD concentration, and a discernible break in the conductivity curve could be observed when beta-CD and bmimPF6 were equimolar in the solution. The solubility and conductivity results indicated that inclusion complexes (ICs) of 1:1 stoichiometry were formed. The inclusion compounds were further characterized by using powder X-ray diffraction (XRD) analysis, 13C CP/MAS (cross-polarization magic-angle spinning) NMR and 1H NMR spectroscopy, and thermogravimetric analysis (TGA). The results showed that the ICs were a fine crystalline powder. The host-guest system exhibited a channel-type structure and each glucose unit of beta-CD was in a similar environment. The decomposition temperature of the ICs was lower than that of bmimPF6 and beta-CD individually. |
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Keywords: | cyclodextrins host–guest systems inclusion compounds ionic liquids |
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