一类不对称含氟吖嗪型液晶的合成及中间相性能研究

Synthesis and Mesomorphic Properties of New Fluorinated Asymmetrical Azine-type Liquid Crystals

通过不以肼为原料的方法合成了一系列新型结构中含有吖嗪基团的不对称含氟液晶——N-(4-烷氧基苯甲醛)-N′-(4-氟苯甲醛)缩连氮,通过红外光谱、核磁共振等方法对其化学结构进行了确认,通过偏光显微镜和差示扫描量热仪对它们的中间相性能研究进行了表征,结果表明所合成的化合物均为互变性向列相液晶,可能是由于奇偶效应,它们的中间相性能随分子结构的变化规律并不明显。

A new series of asymmetrical azine-type liquid crystals, N-（4-Fluorobenzylidene）- N＇-（4-alkoxy- benzylidene）hydrazine, was synthesized with non-hydrazine regents as raw materials. Their chemical structures were identified by IR and 1H NMR. Their mesomorphic properties were studied by polarizing optical microscope and differential scanning calorimeter. It was found that all these compounds were enantiotropic nematic liquid crystals. And owing to the even-odd effect, their mesomorphic properties show no distinct regularity.