Abstract
Partially fluorinated liquid crystals have many desirable properties such as high impedance and low viscosity. The compounds trans -1-(trans -4-alkylcyclohexyl)-2-(4-chlorophenyl)difluoroethylene have very low viscosities and reasonable nematic ranges, and are very suitable for electro-optic displays. The crystal structure of a compound in this homologous series has been determined by X-ray diffraction. The orientational ordering for this compound and for another homologue in their nematic phases has been studied by the use of one and two dimensional 13C NMR. The proton-decoupled 13C spectra are complex due to splittings from the two F-19 nuclei, but they have been analysed by combining chemical shift anisotropy and variable angle spinning studies. Carbon-proton and carbon-fluorine dipolar coupling constants were obtained, and the order parameters for the two conjugated molecular segments (the chlorophenyl ring and the difluoroethylenic link) were calculated from the dipolar coupling constants. The temperature dependences of the local order parameters of each fragment were studied.
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