Biforked mesogens : a new type of thermotropic liquid crystals

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Abstract
Some biforked mesogens belonging to five series were prepared and studied. They exhibit an interesting polymorphism in which both columnar and lamellar mesomorphic orders coexist at different temperatures. The short chains lead to the classical nematic phase and/or the smectic C phase. The long ones give evidence of a hexagonal columnar mesophase similar to the Φh phasmidic phase. One cyclohexane derivative shows a body centered cubic phase and a hexagonal columnar phase with a large lattice parameter corresponding to twice the molecular length

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