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1H‐NMR study of the inclusion processes for α‐ and γ‐cyclodextrin with fenbufen

1H‐NMR spectra of aqueous solutions of fenbufen and two cyclodextrins (α‐ or γ‐cyclodextrin, respectively) mixtures confirm the formation of an inclusion complex if γ‐cyclodextrin is used, whereas in the case of α‐cyclodextrin no inclusion complex was obtained. The stoichiometry of the fenbufen/γ‐cyclodextrin complex is of the [2:1] type. The geometry of this supramolecular architecture was established through MM+ molecular mechanics calculations. © 2005 Wiley Periodicals, Inc. Biopolymers 77: 361–367, 2005