Synthetic pathway for a new calamitic series of liquid crystal: Comparison with corresponding linkage group

GRAPHICAL ABSTRACT

ABSTRACT

Two homologous series based on three linking groups have been synthesized and characterized by elemental analyses and spectroscopic techniques such as Fourier transform infrared [FT-IR] and protonmagnetic resonance magnetic resonance [¹H-NMR] spectroscopy. The mesomorphic properties of these compounds were observed by optical polarized light microscopy (POM) and differential scanning calorimetry (DSC). In this present investigation, we have synthesized two homologous series viz. 4-(3-oxo-3-(4-((-3-phenylallylidene) amino) phenyl) prop-1-en-1-yl) phenyl 4-n-alkoxy benzoate) (series-1) and 4-(3-oxo-3-(4-((-3-phenylallylidene) amino) phenyl) prop-1-en-1-yl) phenyl 3-(4-n-alkoxy phenyl) acrylate (series-2). Both of the series are differing with respect to the first linking group. All the homologous in the following series exhibits LC phase on heating as well as cooling condition except first two homologue (C₁, C₂) in series-1 and three homologue (C₁, C₂, C₃) in series-2.

KEYWORDS:

• Calamitic
• liquid crystals
• nematic
• rod type
• 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.