Physical study of new mesogenic homologous series:
Methyl -p-(p|-n-alkoxycinnamoyloxy) cinnamate

R. B. Patel; N. N. Vyas; A. V. Doshi

Abstract

Physical study of new mesogenic homologous series: Methyl -p-(p|-n-alkoxycinnamoyloxy) cinnamate

Author(s): R. B. Patel, N. N. Vyas,A. V. Doshi

Titled homologous series, Methyl-p(p|-n-alkoxy cinnamoyloxy) cinnamates is synthesized and studied with a view to understand the relation between molecular structure and mesogenic property. First and second member of the series are nonmesomorphic. Third, fourth, fifth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth members of the series are enantiotropic nematic without exhibition of any smectic property even in the monotropic condition. Odd-even effect is not appeared in nematic-isotropic transition curve. Solid-isotropic or solid-nematic transition curve falls from first to fourth member of the series and follows zig-zag path of rising and falling up to fourteenth homologue and further falls to the sixteenth member of the series. Nematic - isotropic transition curve initially rises and then falls in a normal manner. Transition temperatures are observed through hot stage polarizing microscope. Nematic mesophase is of threaded, type of texture in all the derivatives. Average thermal stability is relatively higher and series is of middle orderad melting type. Mesomorphic properties are compared with structurally similar homologous series. Analytical data support the structure of the molecules.

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