Abstract
In order to ascertain the effect of heterocyclic rings on liquid crystal stability, a series of Schiff bases derived from 4′-methoxy-4-biphenylamine and aromatic heterocyclic aldehydes has been prepared. The ability of each compound to form a liquid crystal phase, either by melting the crystal or cooling the isotropic liquid, has been determined, and the appropriate heat of transition and corresponding entropy change have been measured by differential scanning calorimetry. The results will be discussed in terms of geometrical considerations, substituent effects, and intermolecular interactions.
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