Synthesis and characterization of rigid rode shape homologous series: Effect of tail iodo group

GRAPHICAL ABSTRACT

ABSTRACT

In this study, the synthesis, structural characterization and mesomorphic properties of newly thirteen calamitic rod-shaped compounds derived from chalcone and 4-n-alkoxy benzoic acid. Here we present, chalcone as central group and terminal side substituted iodo (−I) group containing homologous series. Comp.C₁ displayed nonmesogenic nature, while comp.C₃ to comp.C₁₈ shows enantiotropic smectic plus nematic property except comp.C₂ which show only nematic phase. It is shown that chalcone as central linking unit favors a calamitic liquid crystalline behaviour in molecules. Phase transition temperatures of present synthesised compounds were determined by optical polarising microscopy (POM), differential scanning calorimetric (DSC). Thermal stabilities for smectic and nematic mesophases are 150.18 and 163.58 respectively.

KEYWORDS:

• Chalcones
• liquid crystal
• nematic
• smectic

Acknowledgement

Authors acknowledge thanks to Dr. R. R. Shah, principal and management of K. K. Shah Jarodwala Maninagar Science College, Ahmedabad. Authors are also thankful to NFDD Centre for providing analytical and spectral services.