含氟双酯类负性液晶化合物的合成和性能（Ⅱ）──（4－对正烷基（烷氧基）苯甲酰氧基－3－氟苯甲酸对正烷基（烷氧基）苯酯

Prepara-tion and Properties of Negative Liquid Crystals(Ⅱ)-p-alkyl(alkoxy)phenyl-4-[p-alkyl(alkoxy)benzoyloxy]-3-fluorobenzoate.

合成了文题所示两个系列计４个液晶化合物。对各化合物进行了红外光谱、核磁共振、质谱和元素分析，确证了其分子结构。测试了各液晶的介电各向异性、相变温度和相态等。结果表明，此类液晶均为负性液晶。

Two series of four title compounds were synthesized.Their structures were identified by using IR,NMR,MS,and element analysis. Their dielectric anisotropy,phase transition tempera-ture and phase states were determined.They were all negative liquid crystals.