A facile synthesis of novel liquid crystalline materials having a trifluoromethoxy group and their electro-optical properties

被引:13
作者
Kanie, K
Takehara, S
Hiyama, T
机构
[1] Tokyo Inst Technol, Res Lab Resources Utilizat, Midori Ku, Yokohama, Kanagawa 2268503, Japan
[2] Dainippon Ink & Chem Inc, Ina, Saitama 3628577, Japan
关键词
D O I
10.1246/bcsj.73.1875
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Novel liquid crystals (LCs) containing a trifluoromethoxy group connected to a cyclohexane mesogen or to an alkyl tail were prepared through an oxidative desulfurization-fluorination reaction of the corresponding dithiocarbonates. They were compared with LCs containing a methoxy group with respect to phase transition behavior and physical and electrooptical properties. Most of the CF3O-substituted LCs exhibited in a wide range of temperatures LC phases depending on the type of a mesogenic structure. LCs with a trifluoromethoxycyclohexane mesogen were shown to be thermally more stable than the LCs with a trifluoromethoxybenzene mesogen. LCs having a trifluoromethoxyalkyl tail show physical and electro-optical properties favorable to materials for not only TN-LCDs but TFT-addressed TN-LCDs. Furthermore, 3-beta-CF3O-substituted cholestane was shown to be a potential chiral dopant for TFT-addressed TN-LCDs.
引用
收藏
页码:1875 / 1892
页数:18
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