INFRARED EXTERNAL REFLECTION SPECTRA OF LANGMUIR FILMS OF STEARIC-ACID AND CADMIUM STEARATE

In situ FT-IR external reflection spectra of spread monolayers (Langmu ir films) of stearic acid and Cd stearate on the water surface were re corded at various surface areas. In the stearic acid monolayer, the tr ans-gauche conformational change upon monolayer compression was observ ed, while only the all-trans conformer was observed in the Cd stearate monolayer. Even in largely expanded monolayers of Cd stearate, presen t is the rigid crsytalline island instead of the rather flexible islan d in the acid monolayer.