【Liq. Cryst., 2007, 34, 1167-1174.】The effect of a single atom in the terminal of fluorocarbon chain on liquid crystalline properties
writer：Yonggang Yang, Haitao Li, Jianxun Wen
keywords：liquid crystalline
source：期刊
specific source：Liq. Cryst
Issue time：2007年
Yonggang Yang, Haitao Li, Jianxun Wen
Liq. Cryst., 2007, 34, 1167-1174.
Eight series of chiral compounds with semi-fluorocarbon chains have been synthesized. The compounds were characterized by IR, 1H NMR, 19F NMR and mass spectroscopies and elemental analysis. Their phase transition behaviour was investigated by differential scanning calorimetry and polarizing optical microscopy. Their clearing points increase with an increase of the length of fluorocarbon chain. For a certain compound, when the terminal hydrogen atom in the semi-fluoroalkyl chain was substituted by a chlorine atom, both the clearing point and melting point were increased, and the thermal stability of the chiral smectic C (SmC*) phase was enhanced. However, the clearing point decreased and the melting point increased with the introduction of a triple bond into the core.