| 摘要 |
A liquid crystal compound selected from a group of compounds represented by formula (a):
wherein Ra and Rb are each independently alkyl having 1 to 10 carbons, alkoxy having 1 to 9 carbons, alkoxyalkyl having 2 to 9 carbons, alkenyl having 2 to 10 carbons, alkenyloxy having 2 to 9 carbons, fluoroalkyl having 1 to 10 carbons or fluoroalkoxy having 1 to 9 carbons; ring A 1 , ring A 2 and ring A 3 are each independently trans-1,4-cyclohexylene, trans-1,3-dioxane-2,5-diyl, trans-tetrahydropyran-2,5-diyl, 1,4-phenylene, 2-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene, 2,5-difluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene, pyridine-2,5-diyl, 6-fluoropyridine-2,5-diyl or pyridazine-2,5-diyl; Z 1 , Z 2 and Z 3 are each independently a single bond, -(CH 2 ) 2 -, -CH=CH-, -C‰¡C-, -CH 2 O- -OCH 2 -, -COO-, -OCO-, -OCF 2 -, -CF 2 O-, -CH 2 CH 2 OCF 2 or -CF 2 OCH 2 CH 2 - l, m and n are each independently 0, 1 or 2, provided that 1+m+n is 0, 1, 2 or 3; one of X 1 and X 2 is fluorine, and the other is chlorine; Q is
and
atoms constituting the compound each may be an isotope thereof. |
