The influence of the thioalkyl terminal group on the mesomorphic behavior of some 6-alkoxy-2-naphthoates derived from 1,3,4-oxadiazole

ABSTRACT

A new series of mesogenic compounds having a naphthalene moiety has been synthesized by esterification of 4-(5-(alkyllthio)-1,3,4-oxadiazol-2-yl)phenol and 6-alkoxy-2-naphthoic acid and their liquid crystalline properties have been studied. All the members of the series are enantiotropic and exhibit smectic as well as nematic mesophase. The plot of transition temperatures versus number of carbon atoms in the alkoxy chain exhibits no odd even effect and falling tendency for isotropic transition temperatures. High anisotropy, linearity confers rich mesomorphic properties on the system.

KEYWORDS:

• Calamitic liquid crystal
• nematic N phase
• smectic A phase
• smectic C phase
• thioalkyl