Synthesis, Characterization and Mesomorphic Study of new Homologous Chalcone Series

A new designed mesogenic homologous series of chalconyl derivative with two ring α-4-Alkoxy benzoyl-β-4/-tetradecyloxy phenyl ethylenehave been synthesized and characterized by a combination of elemental analysis and standard spectroscopic methods. In series, lower members (C5 to C8) exhibit only enantiotropicnematicmesophase but higher members (C10,C12,C14,C16,C18) exhibit enantiotropicnematic as well as smecticmesophase. The nematicmesophase (Thread type) commence from C5 homologue and smecticmesophase(smectic-A type texture) commence from C10 homologue as enantiotropic and persists up to the last member synthesized. Textures are conformed by Polarizing Optical Microscope (POM). The mesomorphic properties of present series were compared with other two structurally similar series to study the effects of change of meta and para position on the mesomorphism