화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.569, 49-56, 2012
Synthesis of Novel Mesomorphic Homologous Series: alpha-4-[-4'-n-Alkoxy cinnamoyloxy] Phenyl-beta-3'' Nitrobenzoyl Ethylenes
Eleven novel mesomorphic homologues were synthesized and evaluated for their mesomorphic properties. The methoxy to n-butyloxy homologues are nonmesomorphic, while the other homologues are enantiotropic mesomorphic. The n-pentyloxy, n-hexyloxy, and n-octyloxy homologues are polymesomorphic, i.e., smectic and nematic mesophases are exhibited enantiotropically. Only the nematic mesophase is exhibited by the n-decyloxy to n-hexadecyloxy homologues. Analytical data confirm the structure and textures of molecules. The nematic mesophase shows a threaded-type texture, and that of smectic phase is of smectic A type. The mesomorphic properties are compared with a structurally similar homologous series. The average thermal stability for the smectic and nematic mesophases is 154.6 degrees C and 163.8 degrees C, respectively, as observed through optical polarizing microscope with heating stage.