Novel organogelators based on pyrazine-2,5-dicarboxylic acid derivatives and their mesomorphic behaviors
作者:Yao-Dong Huang、Wei Tu、Yu-Qin Yuan、Dong-Li Fan
DOI:10.1016/j.tet.2013.12.060
日期:2014.2
A series of new low molecular organogelators (LMOGs) with thermotropic mesophase were synthesized via the reaction of 3,6-dimethyl-pyrazine-2,5-dicarboxylic acid with p-alkoxyl anilines. These compounds readily formed stable gels in a variety of organic solvents and their self-assembly behavior, structure property relationship were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), H-1 nuclear magnetic resonance (H-1 NMR), Fourier transform infrared spectroscopy (FTIR) and ultra-violet visible spectroscopy (UV). The results showed a combination of intra-hydrogen bonding, pi-pi stacking and van der Waals interaction resulted in the aggregation of the organogelators to form three-dimension fibrous networks. The gels formed were multi-responsive to environmental stimuli, such as temperature, fluorinion, and shear stress. More importantly, all the organogelators exhibited thermotropic hexagonal column mesophase as revealed by differential scanning calorimetry (DSC), polarized optical microscopy (POM), and variable temperature XRD studies. A control compound was synthesized and its gelling ability was also checked. (C) 2013 Elsevier Ltd. All rights reserved.