Discotic Mesophases of the Metal-Free Derivative of Octa (Dodecyloxymethyl) Phthalocyanine

Abstract

Abstract The mesomorphic behavior of octa (dodecyloxymethyl) phthalocyanine was studied with DSC, optical microscopy, and X-ray diffraction. Two discotic mesophases were observed as a function of temperature. Their structure corresponds to the piling up of the flat molecules in columns which are laterally assembled according to a two-dimensional hexagonal lattice (D = 31.2 Å). The repeat distance of the molecules along the columns was found to be of about 4.5 Å. The low-temperature discotic phase showed an extra sharp reflection at 20.5 Å, indicating a further ordering of the molecules.