| abstract |
The invention discloses a kind of cycloheptane derivative and preparation method thereof and application.The general structure of this compound is such as formula shown in I.This compound is to light, thermally-stabilised, and wider nematic phase, has wide liquid crystal state temperature range, good low temperature intersolubility, good with other Compound Phase dissolubilities, and especially this compound has low rotary viscosity γn 1 with the characteristic of large dielectric anisotropy (△ ε >0).Synthesize this compounds for low rotary viscosity γn 1 significant with the exploitation of the monomer liquid crystal compound of high dielectric anisotropy △ ε.Liquid crystal compound containing formula I, the temperature range of its mesomorphic phase is wide, and viscosity is little, has suitable refractive anisotrop and low start voltage, liquid-crystal composition material and display performance can be improved, when optics uses, lower threshold voltage and low rotary viscosity γ can be realizedn 1 , significant to the quick response realizing indicating meter. |