Mesomorphic behaviour of forty benzylidene-aniline-p,p′-dialkoxy derivatives

The transition temperatures of forty mesomorphic homologous benzylidene-aniline-p,p′-dialkoxy derivatives are reported.

The transition diagrams show different paths for heating and cooling for most of the compounds. Moreover, some compounds with higher length-breadth ratios, show very complicated thermal cycles with some monotropic phases. In any case, the clearing temperatures (T_c) alternate within every series.

The experimental data are discussed briefly and some general considerations on the structure and mesomorphic behaviour are suggested.