为了满足液晶母体在不同情况下的参数需求，合成了2种新型的含有多氟多氰结构的具有较大负介电各向异性值的未知化合物用于液晶母体的调配。以邻苯二甲腈和邻二氟苯为原料，通过一系列反应合成了2种该类新型液晶单体。通过核磁共振、元素分析等方法确定了分子结构；利用偏光显微镜、示差扫描量热仪和旋转黏度计等测试手段，对其参数进行测定。实验表明，该类多氟多氰类化合物具有较小的光学各向异性值（Δn = 0096~0107）、负值很大的介电各向异性值（Δε= -152~-167）和较大的旋转黏度（γ1= 2348~2486 mPa·s）。该类新型的多氟多氰类化合物可以用于液晶母体的调配并改善其部分性能，且制备方法原料易得，收率较高，易于实现工业化生产。

In order to meet the different demands of the LCD, two novel polyfluorinated polycyano negative dielectric anisotropy liquid crystalline compounds were synthesized.These compounds were synthesized from phthalonitrile and 1,2-difluorobenzene by several steps. Their constructions were confirmed by NMR and elemental analysis.The parameters and the performances of these products were measured by POM, DSC and rotary viscometer.These polyfluorinated polycyano compounds have small optical anisotropy(Δn=0096~0107), large negative dielectric anisotropy(Δε= -152~-167) and high viscosity（γ1= 2348~2486 mPa·s）. These compounds can be used in the LCD matrix to improve partial performance of the LCD. The preparation method is of simple operation and low cost, which can also realize industrialization easily.