Synthesis, Characterization and Phase Behavior with Ester of Terminal Alkoxy Chains and Methoxy Substituent

Abstract

A series of calamitic phenyl ester-aromatic imine derived from the reaction of   4-(N'-(4-methoxyphenyl)acetimidamido)phenyl 4-alkoxybenzoate  by condensing 0.1 Mole of 4- acetamidophenyl -4-n-alkoxy benzoates [B] with 0.1 mole of   4-anisidine exhibited mesomorphic and present series compared with other structure related series have been successfully synthesized and characterized. The general molecular structures of ultimate compounds show the central fragment made up by a hybrid core of phenyl ester-aromatic imine in which the terminal alkoxy(-OR) chains, C_n H_{2n + 1} in which n = 1 to8, 10,12,14 and 16 were connected to phenyl while the other end consists of methoxy moiety attached to a phenyl ring. All the target compounds under polarized lights exhibit enantiotropic nematic phase of which the temperature range was further supported by DSC analysis. It can be summarized that the lengthening of terminal alkoxy (-OR) chains has contributed to the lowering of melting and clearing temperatures as well as the thermal stability of nematic phase.