Cinnamic acid and biphenyl core calamitic asymmetric molecules: preparation and characterization for mesomorphic properties

Abstract

Some cinnamic acid and biphenyl core-derived calamitic molecules weresynthesized and characterized for mesomorphic properties. Newlysynthesized compounds showed well-defined schlieren textures andmosaic textures for the nematic phase and a relatively well-organizedsmectic A phase with focal conic textures. The chemical structures wereconfirmed by FT-IR,1H-NMR,13C-NMR and elemental analysis. Thethermotropic behavior, optical textures and thermal stability have beeninvestigated by differential scanning calorimetry (DSC), polarized opticalmicroscopy (POM), X-ray diffraction (SAXS) and thermal gravimetricanalysis (TGA) respectively.