Syntheses and room mesomorphic properties of novel gallic trimer and tetramer based on acylhydrazone structures

ABSTRACTTwo novel gallic trimer 7 and tetramer 8 based on acylhydrazone structures were designed and synthesized in yields 76% and 81%, respectively. Their structures were confirmed by 1H NMR, ESI-MS, and elemental analysis. Their mesomorphic properties were investigated by DSC, POM, and XRD analyses. The mesomorphic results suggested that they possessed good room-temperature columnar liquid crystalline property with wide range of mesomorphic temperature. The ranges of mesomorphic temperatures for compounds 7 and 8 were as wide as 115°C and 124°C, respectively.