The synthesis of a homologous series of octaalkoxycarbonyl-substituted metal-free phthalocyanines (Pc) is described. The mesomorphic properties of these new materials were studied by differential scanning calorimetry (DSC), optical microscopy and X-ray investigations. All compounds show a discotic mes-ophase in an extremely large temperature interval including room temperature. X-ray diffraction patterns of the mesophases confirm that all compounds form a hexagonal columnar mesophase of the type Dho .
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Dulog et al. (1992) studied this question.
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