Fluorinated pyrimidine-phenyl optically active compounds and liquid crystal compositions thereof
申请人:Takasago International Corporation
公开号:EP0469893A1
公开(公告)日:1992-02-05
Optically active compounds are represented by the formula:
where R₁ is a C6-14 straight chain alkyl or alkoxy group or a C8-12 4-alkylphenyl or 4-alkoxyphenyl group; R₂ is a straight chain C1-9 alkyl group; C* is an asymmetric carbon atom; and X is a hydrogen or fluorine atom, provided that X is fluorine when R₁ contains a phenyl group. 29 such compounds are synthesised and their properties given in Table 1, namely large spontaneous polarization and low viscosity to achieve a fast response time, and in the N* phase of the compound (I), the helical pitch has a small temperature dependence.
Liquid crystal compositions contain a compound (I) and can be used as a chiral dopant for an STN or TN mode of liquid crystal element. The compounds can be mixed with compounds which are not optically active and which show a smectic C phase, 23 of which are listed. These compositions are useful in opto-electric elements.
光学活性化合物由式表示:
其中 R₁ 是 C6-14 直链烷基或烷氧基或 C8-12 4-烷基苯基或 4-烷氧基苯基;R₂ 是直链 C1-9 烷基;C* 是不对称碳原子;X 是氢原子或氟原子,但当 R₁ 含有苯基时,X 为氟原子。合成了 29 种这样的化合物,表 1 给出了它们的特性,即自发极化大、粘度低,以实现快速响应时间,在化合物(I)的 N* 相中,螺旋间距的温度依赖性小。
液晶组合物含有化合物(I),可用作 STN 或 TN 模式液晶元件的手性掺杂剂。这些化合物可与不具有光学活性且呈现出共晶 C 相的化合物混合使用,其中 23 种化合物已经列出。这些化合物可用于光电元件。