Liquid crystal composition, liquid crystal display device, and liquid crystal display

1. A liquid crystal composition, comprising:

a compound represented by general formula (X-1-2) below, wherein the compound represented by general formula (X-1-2) is included in the liquid crystal composition, and a content of the compound represented by general formula (X-1-2) is 7% by mass or less;

a compound represented by general formula (ii) below;

a compound represented by general formula (VIII) below,

a compound represented by formula (2.2) below; and

a compound represented by general formula (XI) below:

(in the formula (ii), R 21a represents an alkyl group having 1 to 8 carbon atoms; one or nonadjacent two or more —CH 2 — in the alkyl group may be each independently substituted by —CH═CH—, —C≡C—, —O—, —CO—, —COO—, or —OCO—; one or two or more hydrogen atoms in the alkyl group may be each independently substituted by a fluorine atom or a chlorine atom;

m 21 represents 0 or 1; X 21 , X 22 , X 23 , and X 24 each independently represent a hydrogen atom, a fluorine atom, or a chlorine atom; and X 25 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, —CF 3 , or —OCF 3 ),

(in the formula (X-1-2), R 10 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms),

(in the formula (VIII), R 8 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, X 81 to X 85 each independently represent a hydrogen atom or a fluorine atom, and Y 8 represents a fluorine atom or —OCF 3 ),

(in the formula, X 111 to X 117 each independently represent a fluorine atom or a hydrogen atom, at least one of X 111 to X 117 represents a fluorine atom, R 110 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and Y 11 represents a fluorine atom or —OCF 3 ).

2. The liquid crystal composition according to claim 1 , further comprising another compound represented by the general formula (X-1-2).

3. The liquid crystal composition according to claim 1 , further comprising another compound represented by the general formula (ii).

4. The liquid crystal composition according to claim 1 , further comprising a compound represented by general formula (L) below,

(in the formula, R L1 and R L2 each independently represent an alkyl group having 1 to 8 carbon atoms; one or nonadjacent two or more —CH 2 — in the alkyl group may be each independently substituted by —CH═CH—, —C≡C—, —O—, —CO—, —COO—, or —OCO—;

OL represents 0, 1, 2, or 3;

B L1 , B L2 , and B L3 each independently represent a group selected from the group consisting of:

(a) a 1,4-cyclohexylene group (one —CH 2 — or nonadjacent two or more —CH 2 — present in the group may be substituted by —O—); and

(b) a 1,4-phenylene group (one —CH═ or nonadjacent two or more —CH═ present in the group may be substituted by —N═), and one and/or two or more hydrogen atoms in the group (a) and the group (b) may be each independently substituted by a cyano group, a fluorine atom, or a chlorine atom;

L L1 and L L2 each independently represent a single bond, —CH 2 CH 2 —, —(CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —COO—, —OCO—, —OCF 2 —, —CF 2 O—, —CH═N—N═CH—, —CH═CH—, —CF═CF—, or —C≡C—; and

when OL is 2 or 3, and a plurality of L L2 are present, L L2 may be the same or different, and when OL is 2 or 3, and a plurality of B L3 are present, B L3 may be the same or different).

5. The liquid crystal composition according to claim 1 , further comprising a compound represented by general formula (M) below,

(in the formula, R M1 represents an alkyl group having 1 to 8 carbon atoms; one or nonadjacent two or more —CH 2 — in the alkyl group may be each independently substituted by —CH═CH—, —C≡C—, —O—, —CO—, —COO—, or —OCO—;

PM represents 0, 1, 2, 3, or 4;

C M1 and C M2 each independently represent a group selected from the group consisting of:

(d) a 1,4-cyclohexylene group (one —CH 2 — or nonadjacent two or more —CH 2 — present in the group may be substituted by —O— or —S—); and

(e) a 1,4-phenylene group (one —CH═ or nonadjacent two or more —CH═ present in the group may be substituted by —N═), and one and/or two or more hydrogen atoms in the group (d) and the group (e) may be each independently substituted by a cyano group, a fluorine atom, or a chlorine atom;

K M1 and K M2 each independently represent a single bond, —CH 2 CH 2 —, —(CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 —, —CF 2 O—, —COO—, —OCO—, or —C≡C—;

when PM is 2, 3, or 4, and a plurality of K M1 are present, K M1 may be the same or different, and when PM is 2, 3, or 4, and a plurality of C M2 are present, C M2 may be the same or different;

X M1 and X M3 each independently represent a hydrogen atom, a chlorine atom, or a fluorine atom; and

X M2 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group, with the compounds represented by the general formula (i) and the general formula (ii) being excluded).

6. A liquid crystal display device comprising the liquid crystal composition according to claim 1 .

7. A liquid crystal display device for an IPS mode, an OCB mode, an ECB mode, a VA mode, or a FFS mode comprising the liquid crystal composition according to claim 1 .

8. A liquid crystal display comprising the liquid crystal display device according to claim 7 .

9. A liquid crystal display comprising the liquid crystal display device according to claim 8 .

10. The liquid crystal composition according to claim 1 , wherein the liquid crystal composition has a rotational viscosity γ1 at 295K of 70 to 90 mPa·s.

11. The liquid crystal composition according to claim 1 , further comprising a compound represented by general formula (IX-2),

wherein R 9 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, X 91 and X 92 each independently represent a hydrogen atom or a fluorine atom, and Y 9 represents a fluorine atom, a chlorine atom, or —OCF 3 .

12. The liquid crystal composition according to claim 1 , wherein the alkyl group of the R 10 has 3 carbon atoms.

13. The liquid crystal composition according to claim 1 , wherein the compound represented by general formula (X-1-2) is included in the liquid crystal composition at a content of 1% by mass or more.

14. The liquid crystal composition according to claim 1 , wherein the compound represented by general formula (X-1-2) is included in the liquid crystal composition at a content of 2% by mass or more.