Liquid crystal compound and liquid crystal display device

摘要

An antiferroelectric liquid crystal compound which is a compound represented by (1) formula (I-a) or (3) formula (I-c) <IMAGE> (I-c) wherein R denotes a linear aliphatic alkyl group having 6 to 14 carbon atoms; A denotes a single bond or an oxygen atom; X and Y independently denote a hydrogen atom or a fluorine atom but they are not hydrogen atoms at the same time; h and i are independently 1 or 2; m is an integer of 3 to 10; Z denotes CH3, C2H5 or CF3; k is 0 or an integer of 5 to 8; l is 0 or 1; n is an integer of 1 to 6; W denotes CH3 or CF3; when W is CH3, p and q are both 0 and r is 8; when W is CF3, p is 5 to 8, q is 1 and r is 1 to 4; and C* denotes an asymmetric carbon atom, and a liquid crystal display device using same.