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Abstract
A new series of liquid-crystalline materials containing the tricycle (4.4.0.03,8)-decane (twistane) and further examples of materials containing the spiro (3,3) heptane system have been prepared and their thermal properties examined. The mesomorphic properties are compared with those of the benzene, trans-cyclohexane and bicycle (2.2.2) octane derivatives. The replacement of the benzene ring in related compounds by the twistane ring results in a lowering of the melting and the clearing points as well as a narrowing of the mesophase interval. The esters of spiro (3, 3) heptane prepared exhibit smectic mesophases with a narrow temperature interval.
