Liquid Crystalline Properties of Terminally Substituted Benzylideneanilines

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Abstract
The preparation and mesomorphic characteristics of certain anils (p-alkoxybenzylidene-p′-alkylanilines and p-alkoxybenzylidene-p′-alkoxyanilines) are described. Fifteen new compounds were found to exhibit nematic behavior below 100°C. The structural effects of the terminal substituents on nematic temperature range are discussed. It has been found that the anils containing n-alkyl substituents in the p-position of the aniline moiety exhibit mesophases in a much lower temperature range than those containing n-alkoxy substituents. Among p-isoalkoxybenzylideneanilines, all compounds except one are non-mesomorphic.