Structure and molecular dynamics of solid-state inclusion complexes of cyclodextrin and permethylated cyclodextrin with benzaldehyde studied by high-resolution CP/MAS13C NMR |
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Authors: | Fu-Hua Kuan Yoshio Inoue Riichiro Chûjô |
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Institution: | (1) Department of Polymer Chemistry, Tokyo Institute of Technology, O-okayama 2-chome, Meguro-ku, 152 Tokyo, Japan |
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Abstract: | The structure and molecular dynamics of the benzaldehyde inclusion-complexes with -and -cyclodextrins and permethylated -cyclodextrin in the solid state have been studied by high-resolution cross-polarization/magic angle sample-spinning13C NMR spectroscopy. It is shown that the guest benzaldehyde molecule undergoes motion in the host cyclodextrin cavity and the rate of motion depend on the cavity size. In the -cyclodextrin complex, compared to -and permethylated -cyclodextrin complexes, the benzaldehyde motion is severely restricted, but under high-vacuum benzaldehyde is released more easily from the cavity. |
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Keywords: | Cyclodextrin inclusion complex benzaldehyde 13C NMR molecular motion |
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