Abstract

Study of new homolgous series of Azoester Mesogens:p- (p'-nalkoxybenzoyloxy)- m-methylphenylazo-p''-methoxybenzenes

Author(s): *Bhoya U. C, **Patel R. B.# and ***Doshi A. V

A new homologous series of azoester mesogens: p-(p'-n-alkoxybenzoyloxy)-m-meyhylphenylazop''- methoxybenzenes has been synthesized with a view to understand the relation between liquid crysral properties and molecular structure. Transition temperatures of the members of the homologous series are observed under Leits Labourlux 12 POL-polarizing microscope with heating stage. The homologues of the series show variation in textures and transition temperatures. Mesomorphism commences from the very first homologue of the series. All the members of the series exhibit enantiotropic mesomorphism except third member which exhibit monotropic-nematic behavior. Smectic mesophase commences from the dodecyl homologue of the series. Dodecyl homologue of the series exhibit polymesomorphism i.e. smectic and nematic phase are present, one after another. The series is of high melting type with considerable mesomorphic range. The thermal stabilities and mesomorphic properties of the series have been compared with other structurally similar homologous series. Texture of the nematic mesophase is of threaded type and that of smectic mesophase is, focal conic fan shaped of type- A for dodecyl and tetradecyl homologue and smectic-C for hexadecyl homologue as determined by miscibility method. Analytical data support the structure of molecules.

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