Mesomorphic Properties of Bromo and Cyano Substituted Diarylethanes

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Abstract
Two homologous series of diarylethanes: 1-(4-alkoxy or alkyl-benzoyloxyphenyl)-2-(4′-bromo or cyanophenyl) ethanes (series I) and I-(4-alkoxy 3-bromo or cyanobenzoyloxyphenyl)-2-(4′-pentylphenyl) ethanes (series II) have been synthesized. The influence of the bromo or cyano group, in the meta or para position, on the mesomorphic range and the clearing point, is studied. In the series I, the bromo group induces a smectic polymorphism, whereas the cyano group induces nematic mesophases. In the series II, the larger the meta substituant, the lower the clearing point.
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