氢键自组装超分子液晶复合物的合成及表征

Synthesis and Characterization of Intermolecular Hydrogen Bond Induced Supermolecular Liquid Crystalline Compound

以4-羟基-4?-苯乙烯基吡啶为质子受体,以4-戊氧基苯甲酸为质子供体,四氢呋喃为溶剂,制备了一种超分子液晶复合物——苯乙烯基吡啶氢键型液晶复合物.用IR1、H 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对所合成液晶化合物进行了相态及液晶行为研究.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;相态及液晶行为研究证明了氢键复合物具有典型的热致液晶性能且呈现明显的向列型液晶态,超分子液晶复合物的相转变温度低于质子供体的相转变温度,且其液晶相范围宽于质子供体,说明分子间氢键起到了稳定液晶相态的作用.

One new hydrogen bond induced liquid crystalline compound with tetrahydrofuran as the solvent, 4-pentyloxybenzoic acid as the proton donor and 4-hydroxyl-4 ′ -stilbazole as the proton acceptor has been synthesized. Their structures of proton donor and supermolecular liquid crystalline compound have been identified by IR,^1 H-NMR and elemental analysis. Their liquid crystalline phase transitions have been studied by DSC and optical polarized microscope. It has been concluded that the IR spectrum of the compound has showed the existence of the intermolecular hydrogen bond. The results of DSC and optical polarized microscope have showed that the proton donor and the supermolecular liquid crystalline compound have typical thermotropic nematic liquid crystal. The phase transition temperature of the supermolecular liquid crystalline compound is different from the proton donor. Meanwhile, the liquid crystalline scope of the compound is much longer than the proton donor, so it has been concluded that liquid crystalline phase could be stablized by the intermolecular hydrogen bond action.