ABSTRACT
A new homologous series 4-(4’-n-alkoxy cinnamoyloxy) azo benzenes 4”acetyl benzen is synthesized with a view to understand and establish the relation between mesogenic properties and structure of molecules. Ethyl to hexadecyl all twelve homologues are enantiotropically nematogenic. None of the homologues exhibit a smectogenic mesophase. An odd–even effect is observed in the transition curve. The average thermal stability is 136.83 °C and the nematogenic mesophase ranges from 25.0 °C to 120.0 °C. Thus, the series is of a middle ordered melting type with moderate nematogenic range. Analytical data confirm the structure of the compounds, and the mesomorphism was identified by optical microscopy. The mesogenic properties are compared with structurally similar compounds.
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