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The effect of molecular structural changes on the mesomorphic nature of a new class of macrocyclic columnar liquid crystal is reported. Twenty-six new compounds with general molecular structure I were prepared, characterized and compared.Only dodecasubstituted ester derivatives 2d-h exhibit thermotropic mesophases. The design of mesogens based on these new, unusual macrocyclic cores requires the presence of the following structural elements: twelve aliphatic side chains, esters as bridging units and small R groups on the core.

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A new series of bowl-shaped columnar liquid crystals 1, having a conformationally mobile macrocyclic core, is described. Four compounds of this series ld-g display a D, columnar mesophase. The effect of structural and conformational changes of the core on the mesomorphic nature and properties of this class of mesogens is described.

No abstract