Abstract
The structure and molecular dynamics of the benzaldehyde inclusion-complexes with α-andβ-cyclodextrins and permethylated α-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 α-cyclodextrin complex, compared to β-and permethylated α-cyclodextrin complexes, the benzaldehyde motion is severely restricted, but under high-vacuum benzaldehyde is released more easily from the cavity.
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