设计合成了结构新颖的乙烯桥键含氟液晶化合物.以4-溴苄溴为起始原料,经3步反应制备出目标化合物,总收率为44.1％～48.3％,目标产物色谱纯度达到99.5％以上.产物结构经IR、1 HNMR、MS确认.用DSC和POM对化合物的相变温度进行了测试,发现该类化合物均呈现向列相.乙烯桥键引入后分子长径比增大,导致熔点、清亮点上升,液晶相区增加.物理测试表明,目标化合物具有清亮点高、介电各向异性大、折光率高的特点,能够缩短液晶响应时间,在液晶显示中具有较好的应用前景.
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