侧向氟取代三环双酯氰基液晶的合成与性能研究

Synthesis and properties of lateral fluorinated three-ring diester liquid crystals containing cyano group

以4-烷基苯甲酸、4-羟基苯甲醛及3-氟-4-氰基苯酚为原材料合成了4种侧向氟取代三环双酯氰基液晶化合物,通过核磁共振(NMR)、质谱(MS)、红外光谱(IR)等分析方法确定了其分子结构,并对上述化合物的相变温度、介电各向异性、光学各向异性进行了测试研究。结果表明,该类化合物在升温过程中均呈现向列相,且具有清亮点高、向列相范围宽、介电各向异性大、光学各向异性大的特点。

Four lateral fluorinated three-ring diester liquid crystal compounds containing cyano group were synthesized from 4-alkylbenzoic acid,4-hydroxybenzaldehyde and 3-fluoro-4-crynophenol.Their structures were confirmed by NMR,MS and IR and the phase transition temperature,ΔεandΔn of these compounds were also tested.It is found that all of these liquid crystal compounds show nematic phase during heating.The measurement of physical properties indicate that the compounds have higher clearing point,lager Δε and Δn and wider range of nematic phase.