Mesomorphic Properties of Some Liquid Crystals with Semifluorocarbon Chains
摘要:
Three series of chiral compounds with semifluorocarbon chains have been synthesized. These compounds were characterized by infra-red spectra (IR), H-1 nuclear magnetic resonance (H-1 NMR), F-19 nuclear magnetic resonance (F-19 NMR), mass spectra (MS), and elemental analysis. Their phase-transition behavior was investigated by differential scanning calorimeter (DSC) and polarizing optical microscopy. To a certain compound, when the terminal hydrogen atom in the semi-fluoroalkyl chain was substituted by a chlorine atom, both the clearing point and the melting point were increased and the thermal stability of the SmC phase was enhanced. Moreover, with the introduction of a triple bond in the core, both the melting point and the clearing point were increased.
Mesomorphic Properties of Some Liquid Crystals with Semifluorocarbon Chains
作者:Haitao Li、Jianxun Wen、Yonggang Yang
DOI:10.1080/15421400701613458
日期:2007.10.22
Three series of chiral compounds with semifluorocarbon chains have been synthesized. These compounds were characterized by infra-red spectra (IR), H-1 nuclear magnetic resonance (H-1 NMR), F-19 nuclear magnetic resonance (F-19 NMR), mass spectra (MS), and elemental analysis. Their phase-transition behavior was investigated by differential scanning calorimeter (DSC) and polarizing optical microscopy. To a certain compound, when the terminal hydrogen atom in the semi-fluoroalkyl chain was substituted by a chlorine atom, both the clearing point and the melting point were increased and the thermal stability of the SmC phase was enhanced. Moreover, with the introduction of a triple bond in the core, both the melting point and the clearing point were increased.