Mesomorphism dependence on terminal polar group in the nonlinear novel azoester series

Abstract

Synthesis of a novel azoester homologous series is carried out with a view to understand and establish the effect of molecular structure on liquid crystal (LC) behaviors of a substance. Novel series consists of ten LC substances. All the homologs are enantiotropically nematogenic without exhibition of smectic property. Transition and melting temperatures, textures of LC are determined by an optical polarizing microscopy equipped with a heating stage. Textures of nematic phase are threaded or schlieren. Transition curves of a phase diagram behaved in normal manner. Nematic–isotropic transition curve exhibited odd–even effect. Analytical and spectral data supported and confirmed the structures of homologues.

Keywords:

• Azoester
• liquid crystal
• mesogen
• mesomorphism
• nematic
• smectic

Acknowledgment

The authors are thankful to the Prof. and Head, Dr. N. K. Shah, Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad for her valuable support and co-operation in research work.