Patent ID: 8609208

Claim:
A liquid crystal composition exhibiting an optically isotropic liquid crystal phase, the liquid crystal composition comprising an achiral component T and a chiral dopant, wherein the achiral component T contains, as a first component thereof, at least one compound selected from the group consisting of compounds represented by formula (1), wherein R 1 is C 1-10 alkyl in which at least one —CH 2 — is optionally replaced by —O— and at least one —(CH 2 ) 2 — is optionally replaced by —CH═CH—; ring A 1 , ring A 2 , ring A 3 , ring A 4 , ring A 5 and ring A 6 are independently 1,4-cyclohexylene or 1,4-phenylene, wherein in the 1,4-cyclohexylene at least one —CH 2 — is optionally replaced by —O— and least one —(CH 2 ) 2 — is optionally replaced by —CH═CH—, and in the 1,4-phenylene at least one —CH═ is optionally replaced by —N═ and at least one hydrogen is optionally replaced by halogen; Z 1 , Z 2 , Z 3 , Z 4 , Z 5 , Z 6 and Z 7 are independently a single bond, —(CH 2 ) 2 —, —COO—, —OCO—, —CF 2 O—, —OCF 2 — or —CH═CH—; X 1 is fluorine, —CF 3 or —OCF 3 ; Y 1 and Y 2 are independently hydrogen or fluorine; i, j, k, m, n, p and q are independently 0 or 1; and i+j+k+m+n+p+q is 1, 2, 3 or 4.