Binary monolayers of functionalized long-chained amphiphiles

Monolayer films of binary systems were investigated with reference to miscibility of the components described in terms of excess surface area, A(exc), and excess free energy of mixing, Delta G(exc). The binary systems contained at least one component able to generate nonlinear optical effects or (and) to show semiconductive ability. The materials tested were: poly(n-octadecylthiophene), p-(1-n-octadecylpyrryl-2-azo)benzenesulfonic acid, (p-(1-n-octadecylpyrryl-2-azo)benzoic acid, and 2,4-dinitrophenylhydrazone of 3-n-octadecanoylpyrrole. As film builders there were used 1-n-octadecylimidazole and 3-n-octodecylpyrrole. On the basis of surface excess area, A(exc), and surface excess free energy, Delta G(exc), the regions of positive synergic interactions between film components were determined.