Abstract
The equilibrium constants (K) for the inclusion complex formationof β-cyclodextrin (β-CD) with Methyl Orange (MO) and substituted azoanilinium chlorides were determinedspectrophotometrically. Based on the results, the substituent effecton the inclusion complexation of β-CD with azoanilinium chlorides was discussed indetail. Further, the solvent effects on the inclusion complexation of MO with β-CD andheptakis(2,6-di-O-methyl)-β-cyclodextrin (DM-β-CD) wereexamined in aqueous organic mixtures with water-miscible organic compounds(dimethylsulfoxide, acetonitrile, N,N-dimethylformamide, and acetone). It was found that the K value for the inclusion complexformation with β-CD and DM-β-CD decreases remarkably with increasing ratioof organic solvents, dependent of the surface tension of solvent mixtures.
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