Abstract

Synthesis and study of benzo-ester homologous series of ethylene derivatives: �?Ž�?±-4-[4�?¢�?�?��?�?�-n-Alkoxy cinnamoyloxy benzoyl ] �?Ž�?²-2�?¢�?�?��?-nitro phenyl ethylenes

Author(s): Chaudhari R. P., Doshi A.V

Titled homologous series consisting of eleven members is a liquid crystal in nature pentyl to decyl members of the series are liquid crystal (LC) while, rest of the members of the series are nonliquid crystals. Enantiotropic nematogenic mesophase with threaded or schlieren texture persisted for pentyl, hexyl, octyl and decyl derivatives of the series. Smectogenic character is totally absent. Phase behavior of a phase diagram is normal for transition curves. Odd-even effect is observed for nematic-isotropic transition curve. Transition temperatures of the homologues are determined by an optical polarizing microscope, equipped with a heating stage. Analytical data supported the structures of molecules. Liquid crystal properties of the titled series are compared with structurally similar homologous series. Nematic-isotropic thermal stability is 171.5oC .Thus; series is predominantly nonmesogenic and partly nematogenic without exhibition of any smectogenic character.

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