Influence of Molecular Structure on Liquid Crystalline Properties and Phase Transitions in These Structures, Part I

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Abstract Three homologous series of Schiff's base compounds have been prepared to investigate the relationship between chemical constitution and mesomorphism, by condensing p-n-alkoxybenzaldehydes with p-n-propoxy-, p-n-butoxy-and p-n-amyloxyanilines respectively and the various transition temperatures are recorded. These series exhibit the general mesomorphic properties as found in other analogous series. It is found that the lower homologues are either non-mesomorphic or nematic while middle members are smectic and nematic both and the higher homologues are purely smectic. In many homologues polymesomorphism in smectic phase is observed.