Chemistry Letters, Vol.29, No.8, 960-961, 2000
Retardation of the molecular rotation of p-nitrophenolate ion in the cavity of a positively charged derivative of alpha-cyclodextrin by electrostatic interactions
H-1 NMR signal for the C(5)-H of A, D glucose residues of bis[6(A),6(D)-(1-pyridinio)-6(A),6(D)-deoxy]-alpha-cyclodextrin shifted downfield, whereas those of B, E and C, F residues shifted upfield, with the addition of p-nitrophenol at pD 11.3. This infers that the molecular rotation of the guest is retarded in the CD cavity.