Thermotropic liquid crystals derived from benzopyranobenzopyran-dione. Preparation and physical characterization

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• The miscibility diagrams only indicate the equivalence of the symmetry of the mesophases with those of the reference samples, i.e. that they are hexagonal columnar (Dh). Whether the mesophases are ordered or disordered within the columns cannot readily be determined from miscibility experiments. From the diffuseness of the 3·4 Å peak in the X-ray diffraction pattern of IB-14 we may conclude that in this compound the mesophase is intermediate between Dho and Dhd
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