HOST-GUEST MONOLAYERS OF COBALT COMPLEX OF OCTAALKOXYPHTHALOCYANINES WITH NEMATIC LIQUID-CRYSTALS

Novel mixed monolayers consisting of metallophthalocyanines and nemati c liquid crystals are described. When a mixture of phthalocyanatocobal t with eight long-chain alkoxy residues and a nematic liquid crystal w as spread on a water surface, a homogeneous monolayer was formed under critical conditions. Although homogeneous hybrid monolayers were obta ined from a mixture of the metallophthalocyanine as a host and a norma l alkane as a guest at an optimum mixing ratio of 1:7, as revealed in our previous work, large excess amounts of liquid crystal molecules we re incorporated in homogeneous host-guest monolayers due to a long-ran ge order of mesophasic molecules. A subphase temperature was required to be set at temperatures where guest molecules are in a liquid crysta lline phase. The perpendicular orientation of guest molecules was conf irmed by employing liquid crystalline azobenzene, 4,4'-dihexylazobenze ne, as a probe compound.