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以对氨基苯甲酸、对硝基苯甲醛和吡啶衍生物为原料合成了两种新型氢键诱导液晶。用IR、1H-NMR和元素分析对所合成的化合物进行了结构表征,并用DSC和带热台的偏光显微镜分别对质子供体和超分子复合物复合前后的液晶行为进行了研究。结果表明:合成了目标化合物;IR结果证明了羧基和吡啶环间分子间氢键代替了羧基间的分子间氢键,复合物表现出分子的热力学行为;液晶行为研究证明了氢键复合物是典型的热致液晶且呈现明显的向列型液晶态,超分子液晶复合物较质子供体的液晶相范围宽且其相转变温度低于质子供体,说明分子间氢键起到了稳定液晶相态的作用。
Two novel hydrogen bond-induced liquid crystals were synthesized from p-aminobenzoic acid, p-nitrobenzaldehyde and pyridine derivatives. The synthesized compounds were characterized by IR, 1H-NMR and elemental analysis. The liquid crystal behavior of proton donor and supramolecular complexes before and after recombination was investigated by DSC and polarized microscope with hot stage respectively. The results showed that the target compound was synthesized. The IR results showed that the intermolecular hydrogen bonding between the carboxyl group and the pyridine ring replaced the intermolecular hydrogen bonding between the carboxyl groups, and the complex showed the thermodynamic behavior. The liquid crystal behavior proved that the hydrogen bonding complex was The typical thermotropic liquid crystal shows obvious nematic liquid crystal state. The supramolecular liquid crystal composite has a wider liquid crystal phase than the proton donor and a lower phase transition temperature than the proton donor, indicating that the intermolecular hydrogen bond acts as a stable liquid crystal phase The role of state.