화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.240, 201-216, 1994
Long-Period Structure of Langmuir-Blodgett Multilayer Assemblies
The structures of cadmium eicosanoate (CdC220AC) and cadmium pentacosa-10,12-diynoate (Cd12-8AC) Langmuir-Blodgett multilayers were studied using x-ray structure analysis methods. The trial and error model refinements indicated the fully ionized salts exist in a linear arrangement where the polar heads of the opposing monolayers are ionically bound with the cadmium ion nested between the carboxylates. The molecular orientation of CdC20AC was found to be normal to the substrate, whereas Cd12-8AC was inclined by about 30 degrees to accommodate the diacetylene moiety. A mechanism for the salt formation upon deposition was rationalized by considering the dissolved counter ions to be loosely bound within the electric double layers of the floating and submerged/deposited monolayers.