为了满足液晶光学器件快速响应的要求,采用有机合成方法获得了6种单氟取代苯基二苯乙炔基异硫氰酸酯类液晶化合物.首先用IR和1HNMR对6种单氟取代液晶化合物的结构进行了表征,其次通过差热分析对其相变温度进行了测试,利用液晶综合参数测试仪对其液晶性能进行了研究.红外和核磁图谱表明合成的化合物即为目标化合物;差热分析获知这些化合物90 ℃左右进入液晶相,并且氟取代位置在与异硫氰酸酯基相连苯环的2号位置时有相对较低的熔点,最低的熔点可达到83.4℃;液晶综合参数测试结果表明这6种化合物的Δn值为0.432~0.681,同时氟取代位置在与异硫氰酸酯基相连苯环的3号位置时有相对更佳的响应性能.这些化合物在制备快速响应液晶光学器件中可能会有潜在的应用价值.

In order to obtain fast response liquid crystal optics devices,six kinds of single fluorinated isothiocyanate phenyl-tolane liquid crystal compounds were synthesized via couple reaction and reduction.Δn value of these LCs is very high,about 0.432~0.681.IR and HNMR spectrograms indicated that the structure was correct.DSC test results showed that these LCs became into liquid crystal phase at about 90 ℃.When these LC compounds were mixed in the commercial alkyne LCs respectively,the LCs compounds with its fluorine atom at 2 position exhibited low viscosity,but the LCs compounds with its fluorine atom at 3 position had better figure of merit.Of course,these LCs compounds could be used in the LC optics devices.