Diffusion Coefficients of the Ternary System α-Cyclodextrin−Sodium Benzenesulfonate−Water at 25 °C: The Effect of Chemical Equilibrium and Complex Formation on the Diffusion Coefficients of a Ternary System

Abstract

Diffusion coeffs. have been measured in the ternary system α-cyclodextrin-sodium benzenesulfonate-water at 25°. The higher mobility of the inclusion complex, compared to that of free cyclodextrin, proves that in the presence of binding complexes between solutes it is possible to measure pos. cross diffusion coeffs. Previously only neg. cross terms have been measured in systems contg. cyclodextrin-ligand complexes. A discussion of the concn. dependence of the four diffusion coeffs. and of the sign of cross terms is given