STRUCTURE AND MORPHOLOGY OF LANGMUIR-BLODGETT-FILMS COMPOSED OF A MIXTURE OF [TETRAKIS(CUMYLPHENOXY) PHTHALOCYANINE]COPPER AND OCTADECANOL

The morphology and structure of Langmuir-Blodgett (LB) films of a 1:1 mixture of [tetrakis(cumylphenoxy) phthalocyanine]copper (CuPc(Cp)4) and 1-octadecanol were studied by transmission electron microscopy. scanning electron microscopy, electron diffraction and X-ray diffraction. The LB film is a Y-type membrane, whose interlayer spacing is determined to be 23.5 angstrom from the X-ray diffraction pattern. The average area occupied by the mixture of CuPc(Cp)4 and octadecanol is 28 angstrom2 molecule-1. To explain the interlayer spacing and the average area consistently, we propose a novel structure for the LB layer, which consists of a stack of eight CuPc(Cp)4 molecules lying flat on the substrate, and eight octadecanol molecules penetrating through the stacking CuPc(Cp)4 molecules in the peripheral space of phthalocyanine rings surrounded by cumylphenoxy groups. In the fractured LB film, many wide layers having crystallographical cleavage planes were observed. This result suggests that the LB film essentially consists of thin crystals.