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Autori: A. Pirnau, M. Bogdan and C. G. Floare
Editorial: Journal of Physics: Conference Series, 182, p.012013, 2009.
The inclusion of vanillin by beta-cyclodextrin was investigated by 1H NMR. The continuous variation technique was used to evidence the formation of soluble 1:1 complex in aqueous solution. The association constant of vanillin with beta-cyclodextrin has been obtained at 298 K by fitting the experimental Delta_delta_obs = delta_free – delta_obs of the observed guest and host protons, with a non-linear regression method. Besides the effective association constant, the fitting procedure allows a precise determination of all chemical shift parameters characterizing the pure complex. They can by used for an analysis of the geometry of the molecular complex in solution.
Cuvinte cheie: beta-cyclodextrin, vanillin, inclusion compound