A Homologous Series containing Ester and Amide Groups as Central Linkages: 4(4'-n-Alkoxybenzoyloxy)-4”-n-Heptyloxy Benzanilides

Abstract

The first extensive homologous series, comprising thirteen members, with both ester and amide groups as central linkages has been synthesised and the mesomorphic properties have been determined. The homologues are comparatively high melting and exhibit liquid crystal phases. The molecular structure seems to favour smectic properties since smectic phases commence with the ethoxy derivative as a monotropic phase. The ethoxy to hexadecyloxy derivatives are poly-mesomorphic in nature, while the octadecyloxy derivative is purely smectic. The mesomorphic behaviour and mesophase thermal stabilities are compared with those of other structurally related series, and the effect of the amide group on mesomorphism is evaluated.