Novel liquid crystal compounds and liquid crystal compositions containing same

摘要

A novel pyridine derivative capable of increasing the dielectric anisotropy value ( DELTA epsilon ) or optical anisotropy value ( DELTA n) of liquid crystal compositions including the derivative and lowering the driving voltages of liquid crystal display elements using the composition, and also a liquid crystal composition containing the pyridine derivative are provided, which pyridine derivative is expressed by the formula R-X-COO-Y-CH2CH2-Z-A wherein R represents an alkyl group or an alkoxy group each of 1-10 carbon atoms; X represents <IMAGE> Y represents <IMAGE> when Y is <IMAGE> Z represents <IMAGE> and A represents F, Cl or cyano group; and when Y is <IMAGE> Z represents <IMAGE> and A represents an alkyl group or an alkoxy group each of 1-10 carbon atoms.