Design, Synthesis, and Evaluation of New Ferroelectric Liquid Crystals

铁电液晶（FLC）的合成研究已经广泛开展，因为FLC材料有望应用于具有高速开关的显示器。大自发极化（Ps）和短响应时间的FLCs合成设计导致具有手性中心和极性基团在苯基位置的光学活性化合物。掺有氰环丙烷、氟环丙烷、-内酯、四氢呋喃或1,3-二氧六烷衍生物的FLC混合物显示出较大的Ps。Ps的符号被发现与化合物手性中心的绝对构型密切相关。设计和合成用于快速开关的氟化碳导致了光学活性氟取代化合物，如氟烷基醚、氟烷基酯、氟烷酸酯和1-芳基氟烷烃。特别是以2-氟烷氧基、3-氟烷氧基或3-氟烷基为手性链的苯基嘧啶，反应时间短。含有2,3-二氟烷氧基或2-氟-2-甲基烷氧基的化合物也被发现具有较大的Ps'。

Synthetic studies of ferroelectric liquid crystals (FLCs) have been extensively carried out, since FLC materials are expected to be applicable to displays with high speed switching. Synthetic design of FLCs with a large spontaneous polarization (Ps) and a short response time led to optically active compounds having a chiral center and a polar group at benzylic position. FLC mixtures doped with a cyanocyclopropane, fluorocyclopropane, gamma-lactone, tetrahydrofuran, or 1,3-dioxane derivative exhibited large Ps. The sign of Ps was found to well correlate to the absolute configuration of the chiral center of the compound. Design and synthesis of FLCs for fast switching led to optically active fluorine-substituted compounds like fluoroalkyl ethers, fluoroalkyl esters, fluoroalkanoic acid esters, and 1-arylfluoroalkanes. Especially phenylpyrimidines having 2-fluoroalkoxyl, 3-fluoroalkoxyl, or 3-fluoroalkyl group as a chiral chain realized short response time. Compounds containing 2,3-difluoroalkoxyl or 2-fluoro-2-methylalkanoyloxy group also were found to exhibit large Ps'.