Syntheses and Physical Properties of Model Compounds of Ferroelectric Liquid Crystal with Simple Molecular Structure

为了得到分子结构简单的铁电液晶模型化合物，合成了端基为卤素原子或其他取代基的正长链化合物和含手性基团的长链化合物。对这些化合物的物理性质进行了测试，并对我们实验室已经进行了单晶结构分析的样品1，16-十六碳二醇进行了介电常数测量和DSC测量。样品呈现高温相，该相为分子绕其长轴旋转的旋转相。这个旋转体相看起来像是液晶。并对1，13-十三碳二醇的单晶结构进行了分析。在此基础上，通过引入手性基团合成了铁电液晶模型化合物，合成了铁电液晶模型化合物。遗憾的是，在这些化合物中没有观察到铁电性的出现，但在偏光显微镜下观察到了类似铁电液晶的织构。极化反转的力学分析目前正在进行中。

Syntheses of normal long chain compounds, of which terminal groups were halogen atoms or other substituents, and the long chain compounds containing chiral group were made in order to obtain model compounds of ferroelectric liquid crystal with simple molecular structure. Measurements of physical properties of these compounds were also carried out.Dielectric constant measurements and DSC ones of the sample, 1,16-hexadecanediol, of which single crystal structure analysis was already done in our laboratory, were made. The sample showed high temperature phase, and this phase was identified as rotator phase in which the molecules rotated around its long axs. This rotator phase seemed to be liquid crystal. The single crystal structure analysis of 1,13-tridecanediol was also made. The structure obtained was quite similar to that of smentic A,one of the typical structure of liquid crystals, and different from that of 1,16-hexadecanediol of which structure is herringbone.On the bases of these facts obtained from this investigation, syntheses of model compounds of ferroelectric liquid crystal were made by inroduction chiral group to normal long chain compounds. Unfortunately, appearance of ferroelectricity was not observed in these compounds, but similar texture of ferroelectric liquid crystals was observed by polarizing microscope in a few compounds synthesized here.Study on mechanical analysis of inversion of polarization is now in progress.