Novel difluoro ethylene diether liquid crystal and its composition

The invention provides a novel liquid crystal compound of formula (I) containing difluoro ethylene diether. The liquid crystal compound disclosed herein has good chemical and physical stability and low birefringence, and a negative liquid crystal monomer and a liquid crystal composition which contain the structure have large dielectric anisotropy and low driving voltage. The invention further provides a liquid crystal composition of one or more liquid crystal compounds. The liquid crystal composition has good low temperature intersolubility, low birefringence and fast response time, and can be applied in liquid crystal elements containing the liquid crystal medium, especially in liquid crystal display elements containing the negative liquid crystal medium.