Preparation of azo compounds as liquid crystals
Abstract
A new homologous series of symmetric dimers :α,β- Bis(4-n-alkoxy-2,3,5,6- methyl-4̀-oxy-Azo-benzene)ethane (n=1-7).have been synthesized and characterized by , IR, 1H-NMR and CHN analysis. Their liquid crystalline properties have been determined by polarizing optical microscopy (pom).All the members except the member (n=1) show mesomorphic properties. The members (n=2,3) show enantiotropic pure nematic phase while the members (n=4-7) show entiotropic smectic C phase in addition to enantiotropic nematic phase .
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