Abstract
Abstract A homologous series of Schiff's base compounds has been synthesized to investigate the relationship between chemical constitution and mesomorphism, by condensing 4-n-alkoxy-1-naphthaldehydes with 4,4′-diaminodiphenyl (benzidine) and determining the transition temperatures of the compounds. It is observed that all the members of the series exhibit the general mesomorphic properties found in other analogous series. The first eight members of the series are nematic; the middle members are both smectic and nematic and the higher homologues, in analogy with the corresponding members of the similar series, are purely smectic. It is observed that the individual members of this series are comparatively less stable than the corresponding members of the N, N′-di(4-n-alkoxybenzylidene)-benzidine series. This can be attributed to the presence of the broad naphthalene nucleus in the present series.
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