COUNTERION BINDING BY SURFACTANT BETA-CYCLODEXTRIN INCLUSION COMPLEXES

Sodium ion activities were determined potentiometrically in sodium dodecylsulfate and sodium dodecanoate solutions containing β-cyclodextrin. Whereas sodium ion did not bind with β-cyclodextrin, its activity decreased noticeably when the 1:1 β-cyclodextrin/surfactant inclusion complex was formed in solution. When the anionic guest was methyl red or methyl orange, no sodium ion binding occurred. When the guest was the cationic dodecylammonium ion in chloride solutions containing β-cyclodextrin, pronounced chloride ion binding to the 1:1 inclusion complex occurred. © 1990 Kluwer Academic Publishers.