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A chalconyl trans vinyl ester homologous series of thermotropic liquid crystals RO- C6H4-CH=CH-COO-C6H4-CH=CH-CO-C6H3 (OCH 3)2 meta-para is synthesized and studied with a view to understand and establish the relation between molecular structure and mesomorphism or mesomorphic behaviors. Novel homologous series consists of thirteen homologues (C 1 to C 18 ). First five (C 1 to C 5) homologues are nonmesogenic. Rest of the homologues (C 6 to C 18 ) homologues is mesogenic. Monotropically smectogenic character appears from C 6 to C 10 homologue and C 12 to C 18 homologues are enantiotropically smectogenic. Nematogenic property is totally absent throughout a series. Textures of smectic phase are of the type smectic A or C. Transition curves of a phase diagram behaved in normal manner. Analytical, spectral and thermal data supports the molecular structures of homologues. Odd-even effect is observed for Sm-I/I-Sm transition curve. Thermal stability for smectic is 93.7 o C and the mesomorphic phase lengths from enantiotropic homologues for smectic from minimum to maximum is 6.0 o C to 28.0 o C at the C 12 and C18 homologue respectively. Series is smectogenic without exhibition of nematic property. The group efficiency order on the basis of thermal stability is derived; from comparative study of present series and analogous series.

Mesomorphism Dependence on Cis-Trans Configuration and Varying Terminal/Lateral Group