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通过醚化、还原、缩合及酯化等反应,合成了以4-[((4-己烷氧苯基)亚氨基)甲基]苯基异烟酸酯为质子受体,烷氧基苯甲酸为质子供体,氢键为链接基的希夫碱型超分子液晶化合物。用IR、1H NMR对中间体及其产物进行了结构表征,并用热台偏光显微镜分别对目标产物的液晶行为进行了研究。通过IR对羧基和吡啶环间分子间氢键的形成进行了验证,通过偏光显微镜说明氢键复合物是典型的热致液晶且呈现近晶相和向列相两种相态,并且复合物较质子供体和受体的液晶相范围宽,说明分子间氢键起到了稳定液晶相态的作用。
Through the reaction of etherification, reduction, condensation and esterification, the reaction of 4 - [((4-hexaneoxyphenyl) imino) methyl] phenylisonicotinate with proton acceptor, Formic proton donor, hydrogen bond is a Schiff base type supramolecular liquid crystal compound. The structures of the intermediates and their products were characterized by IR and 1H NMR. The liquid crystal behavior of the target products were studied by hot-stage polarization microscope. The formation of intermolecular hydrogen bonds between carboxyl groups and pyridine rings was verified by IR. The polarization microscopy showed that the hydrogen bonding complexes are typical thermotropic liquid crystals and exhibit two phases: smectic phase and nematic phase, The proton donor and acceptor have a wide range of liquid crystal phase, which shows that the intermolecular hydrogen bond plays a role of stabilizing the liquid crystal phase.