末端为噻吩基团酯类化合物的合成、表征及液晶性能研究

以噻吩甲醛、对氨基苯甲酸、溴丙烷、对羟基苯甲酸为原料,经过醚化反应、希夫碱反应、DCC/DMAP酯化反应合成了噻吩衍生物液晶。化合物的结构由红外光谱、核磁共振氢谱进行了表征,噻吩衍生物的液晶性能用偏光显微镜进行了研究。结果表明:以噻吩为末端的化合物在升温和降温过程中均表现出很好的向列相液晶性能;特别是在降温过程中表现出较低的结晶点和更宽的液晶相温度范围。

Synthesis,characterization and mesogenic behavior of ester compound with thiophene as terminal group

The thiophene derivatives liquid crystal were synthesized via etherification,Sehiff base,DCC/DMAP esterification reaction with thiophene carboxaldehyde,p-aminophenol,bromopropane and p-hydroxybenzoic acid as raw materials.The structure of compounds were confirmed by IR,1H-NMR and the liquid crystalline properties of thiophene derivatives were studied by polarizing optical microscopy(POM).The results showed that the compound with thiophene as end group had agood performance of nematic liquid crystalline in the heating and cooling process.Especially,there was a lower crystallizing point and a broader liquid crystalline phase temperature range on cooling.