Effect of alkyl chain in the terminal ester group on mesomorphic properties of new rod like homologous series: Synthesis and characterization

GRAPHICAL ABSTRACT

ABSTRACT

The mesomorphic properties of linear chalconyl ester homologous series can be tuned in a predictable fashion with tail groups (‒OC₅H₁₁) substituents on the terminal side and nitro group substitute at lateral position. Novel series consisted 13 members (C₁ to C₈, C₁₀, C₁₂, C₁₄, C₁₆, C₁₈). C₁ to C₅ homologues are nonliquid crystal, C₆ to C₁₈ homologues display smectic and nematic mesophase enantiotropically manner except C₅ homologue, which show only nematogenic mesophase. The texture of the nematic mesophase is of fan-shaped, Schlieren, and nematic droplets type. All these compounds were characterized by elemental analyses and spectroscopic techniques such as [FTIR] and ¹H Nuclear magnetic resonance [NMR] spectroscopy. The mesomorphic properties of these compounds were observed by optical polarized light microscopy (POM) and differential scanning calorimetry (DSC).

KEYWORDS:

• Calamatic liquid crystal
• enantiotropic
• mesophase
• nematic
• smectic

Acknowledgments

Authors acknowledge thanks to Dr. R. R. Shah, principal of K. K. Shah Jarodwala Maninagar Science College, Ahmedabad. Authors gratefully thanks from Anuj S. Sharma and Akshara P. Shah for valuable discussion in DSC study (Chemistry department, Gujarat University). Authors also thank to Centre of Excellence, Rajkot for the spectral services.