RECOGNITION PROPERTIES OF AMPHIPHILIC CYCLODEXTRIN MONOLAYERS AT THE AIR-WATER-INTERFACE

Recognition properties of the monolayers of amphiphilic cyclodextrins (CDs) at the air-water interface were investigated by using the Langmu ir-Blodgett technique. The CD having amino groups interacted with wate r-soluble azobenzene, exhibiting an increase in area per molecule with repeated compression and expansion of the monolayer. By introducing o ne or three isomers of water-soluble azobenzene into the subphase afte r the formation of the CD monolayers, the amounts of the incorporated. azobenzene were obtained by the subsequent transfer of the monolayers . The results indicate that the CD cavity is not the only binding site for azobenzene and that the amounts of the incorporated azobenzene ar e governed not just by the relationship between the cavity size and th e shape of the azobenzene molecule.