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High-resolution, solid-state 13C-n.m.r. spectra were obtained for several crystalline cyclomaltohexaose inclusion-complexes. The resonances of C-1, C-4, and C-6 of the host were dispersed. The averaged 13C shifts of these resonances were in good agreement with the 13C shifts observed in solution, where the dispersion due to conformational diversity is expected to be averaged by rapid interconversion of the conformers. This result indicates that the most plausible source of the solid-state 13C-shift dispersions of the resonances of C-1 and C-4 is the diversity of conformations about the glycosidic linkage. The molecular origins of conformation-dependent 13C shifts are discussed. 相似文献
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