The mesomorphic effect of –CH2-CH2- spacer on thiophene chalconyl ester containing compounds

ABSTRACT

A new thiophene ring containing chalconyl ester homologous series was synthesised with ethyl spacer to understand the effect of structural change on mesomorphism. This homologous series was compared with well reported similar homologous series to evaluate the liquid crystal properties after addition of ethyl spacer. This series contain 12 homologues. Among 12 homologues C₁₀ to C₁₆ homologues show smectic phase while others are non-mesomorphic in nature. The study of mesomorphism and non-mesomorphism were carried out with the comparison and some important conclusions were drawn. All homologues of series were confirmed by different analytical technique like ¹H NMR, IR, mass spectrometry, elemental analysis. Transition temperature of all synthesize homologues were carried out by polarizing optical microscope with hot stage and also it was confirmed by DSC analysis.

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WSN 169 (2022) 183-201

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