Novel fluorinated liquid crystals. Part VI. The synthesis and phase transition of novel cholesteric liquid crystals containing 1,4-tetrafluorophenylene units
作者:Jianxun Wen、Minquan Tian、Qi Chen
DOI:10.1016/0022-1139(94)03048-0
日期:1994.8
1-[(4-n-Alkoxy-2,3,5,6-tetrafluorophenyl)ethynyl]-4-[(4-((S)-2-methylbutoxy)-2,3,5 ,6-tetrafluorophenyl)ethynyl]benzenes have been prepared from the starting material 1-pentafluorophenyl-2-trimethylsilylacetylene. Textural observation by polarizing microscopy showed that these materials were cholesteric liquid crystals when the terminal alkoxy chains were of sufficient length. The effect of symmetrical
1-[(4-正烷氧基-2,3,5,6-四氟苯基)乙炔基] -4-[(4-((S)-2-甲基丁氧基)-2,3,5,6-四氟苯基)乙炔基由起始原料1-五氟苯基-2-三甲基甲硅烷基乙炔制备了]苯。偏光显微镜的织构观察表明,当末端烷氧基链具有足够的长度时,这些材料是胆甾型液晶。还讨论了苯基的对称四氟取代对介晶行为的影响。