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Journal of inclusion phenomena

, Volume 6, Issue 1, pp 31–40 | Cite as

Variable temperature CP/MAS13C NMR study of cyclodextrin complexes of benzaldehyde

  • John A. Ripmeester
Article

Abstract

Fully hydrated as well as dried benzaldehyde complexes of α- and β-cyclodextrins were studied by using CP/MAS13C NMR techniques. Variable temperature studies have shown that below ∼ 200 K the guest is rigidly held in the complex, whereas at 328 K, only the aromatic ring performs rapid two-fold flips about the C1−C4 axis. In the β-Cd complex the benzaldehyde performs more general reorientation. Removal of water causes marked changes in both guest and host spectra, generally consistent with a loss of short-range order and increase in guest motional rate.

Key words

Cyclodextrin CP MAS13C NMR benzaldehyde molecular motion 

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Copyright information

© National Research Council of Canada 1988

Authors and Affiliations

  • John A. Ripmeester
    • 1
  1. 1.Division of ChemistryNational Research Council of CanadaOttawaCanada

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