SYNTHESIS AND CHARACTERIZATION OF SOME NONUNIFORMLY SUBSTITUTED MESOGENIC PHTHALOCYANINES

Eleven phthalocyanine derivatives substituted asymmetrically with a to tal of eight alkyl and hydroxyalkyl substituents at the non-peripheral sites, or with six non-peripheral alkyl chains and a dioxolane group at the peripheral positions, have been prepared by unambiguous synthes es. All exhibit thermotropic liquid-crystalline behaviour which has be en characterised using differential scanning calorimetry (DSC) and pol arised optical microscopy.