Abstract
Abstract The solid state inclusion complexes of benzaldehyde with α-, β- and γ-cyclodextrins have been studied by cross-polarization and magic angle spinning solid state NMR techniques (CPMAS-NMR). The effects of complexation on the mobility of the guest have been analyzed in terms of nuclear relaxation parameters such as 13C spin-lattice relaxation (T1), 1H spin-lattice relaxation in the rotating frame (T1ρ(H)), and cross polarization transfer (TCH). It is proposed that large variations observed in the TCH values of the guest in the three complexes may be interpreted in terms of motion with correlation times in the range between ca. 0.1–5.0 msec. These motions may strongly affect the extent of the heteronuclear dipolar coupling partially responsible in determining the rates of cross polarization.
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