Four-ring liquid crystal compound having lateral fluorine, liquid crystal composition and liquid crystal display device
View Patent ↗The invention provides a liquid crystal compound which has stability to heat, light and so forth, a nematic phase in a wide temperature range, a small viscosity, a large optical anisotropy, and a suitable elastic constant K 33 , and further has a suitable and negative dielectric anisotropy and an excellent compatibility with other liquid crystal compounds. Moreover, the invention provides a liquid crystal composition comprising this liquid crystal compound and a liquid crystal display device containing this liquid crystal composition. A liquid crystal compound represented by formula (a): for example, R 1 and R 2 are alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons or alkoxy having 1 to 9 carbons; ring A 1 and ring A 2 are 1,4-phenylene or trans-1,4-cyclohexylene; L 1 and L 2 are hydrogen or fluorine, and at least one of L 1 and L 2 is fluorine; and Z 1 and Z 2 are a single bond, —(CH 2 ) 2 —, —CH═CH—, —CH 2 O— or —OCH 2 —.
1. A liquid crystal compound represented by formula (a):
wherein, in formula (a),
R 1 and R 2 are each independently hydrogen, alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons, alkoxy having 1 to 9 carbons, alkoxyalkyl having 2 to 9 carbons or alkenyloxy having 2 to 9 carbons;
ring A 1 and ring A 2 are each independently 1,4-phenylene, trans-1,4-cyclohexylene, tetrahydropyran-2,5-diyl, tetrahydropyran-3,6-diyl, 1,3-dioxane-2,5-diyl, 1,3-dioxane-3,6-diyl, pyrimidine-2,5-diyl, pyrimidine-3,6-diyl, pyridine-2,5-diyl or pyridine-3,6-diyl;
L 1 and L 2 are each independently hydrogen or fluorine, and at least one of L 1 and L 2 is fluorine;
when one of ring A 1 and ring A 2 is 1,4-phenylene, the other is trans-1,4-cyclohexylene, tetrahydropyran-2,5-diyl, tetrahydropyran-3,6-diyl, 1,3-dioxane-2,5-diyl, 1,3-dioxane-3,6-diyl, pyrimidine-2,5-diyl, pyrimidine-3,6-diyl, pyridine-2,5-diyl or pyridine-3,6-diyl; and
Z 1 and Z 2 are each independently a single bond, —(CH 2 ) 2 —, —CH═CH—, —C≡C—, —CH 2 O—, —OCH 2 —, —COO— or —OCO—.
2. The compound according to claim 1 , wherein the compound is represented by formula (a-1) or (a-2):
wherein, in formulas (a-1) and (a-2),
R 3 and R 4 are each independently alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons, alkoxy having 1 to 9 carbons, alkoxyalkyl having 2 to 9 carbons or alkenyloxy having 2 to 9 carbons;
ring A 3 and ring A 4 are each independently 1,4-phenylene, trans-1,4-cyclohexylene, tetrahydropyran-2,5-diyl or tetrahydropyran-3,6-diyl;
when one of ring A 1 and ring A 2 is 1,4-phenylene, the other is trans-1,4-cyclohexylene, tetrahydropyran-2,5-diyl or tetrahydropyran-3,6-diyl;
L 3 and L 4 are each independently hydrogen or fluorine, and at least one of L 3 and L 4 is fluorine; and
Z 3 and Z 4 are each independently —(CH 2 ) 2 —, —CH═CH—, —CH 2 O—, —OCH 2 —, —COO— or —OCO—.
3. The compound according to claim 2 , wherein the compound is represented by formula (a-11) or (a-14):
wherein, in formulas (a-11) and (a-14),
R 7 and R 8 are each independently alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons, alkoxy having 1 to 9 carbons, alkoxyalkyl having 2 to 9 carbons or alkenyloxy having 2 to 9 carbons; and
Z 7 and Z 8 are each independently —(CH 2 ) 2 —, —CH 2 O—, —OCH 2 —, —COO— or —OCO—.
4. The compound according to claim 2 , wherein the compound is represented by any one of formulas (a-17), (a-20), (a-23), and (a-26):
wherein, in formulas (a-17), (a-20), (a-23), and (a-26),
R 9 and R 10 are each independently alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons, alkoxy having 1 to 9 carbons, alkoxyalkyl having 2 to 9 carbons or alkenyloxy having 2 to 9 carbons; and
Z 9 and Z 10 are each independently —(CH 2 ) 2 —, —CH 2 O—, —OCH 2 —, —COO— or —OCO—.
5. The compound according to claim 3 , wherein, in formulas (a-11) and (a-14), Z 5 and Z 6 are —CH 2 O— or —OCH 2 —.
6. The compound according to claim 3 , wherein, in formulas (a-11) and (a-14), Z 5 and Z 6 are —COO— or —OCO—.
7. The compound according to claim 4 , wherein, in formulas (a-17), (a-20), (a-23), and (a-26), Z 7 and Z 8 are —CH 2 O— or —OCH 2 —.
8. The compound according to claim 4 , wherein, in formulas (a-17), (a-20), (a-23), and (a-26), Z 7 and Z 8 are —OCH 2 —.
9. The compound according to claim 4 , wherein, in formulas (a-17), (a-20), (a-23), and (a-26), Z 7 and Z 8 are —COO— or —OCO—.
10. A liquid crystal composition which has negative dielectric anisotropy, comprising a first component which is at least one compound selected from compounds according to claim 1 , and a second component which is at least one compound selected from the group of compounds represented by formulas (e-1) to (e-3):
wherein, in formulas (e-1) to (e-3),
Ra 11 and Rb 11 are each independently alkyl having 1 to 10 carbons, and in this alkyl, —CH 2 — may be nonadjacently replaced by —O—, and —(CH 2 ) 2 — may be nonadjacently replaced by —CH═CH—, and hydrogen may be replaced by fluorine;
ring A 11 , ring A 12 , ring A 13 and ring A 14 are each independently trans-1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, pyrimidine-2,5-diyl, pyrimidine-3,6-diyl, 1,3-dioxane-2,5-diyl, 1,3-dioxane-3,6-diyl, tetrahydropyran-2,5-diyl or tetrahydropyran-3,6-diyl; and
Z 11 , Z 12 and Z 13 are each independently a single bond, —CH 2 —CH 2 —, —CH═CH—, —C≡C—, —COO— or —CH 2 O—.
11. A liquid crystal composition which has negative dielectric anisotropy, comprising a first component which is at least one compound selected from the group of compounds according to claim 2 , and a second component which is at least one compound selected from the group of compounds represented by formulas (e-1) to (e-3):
wherein, in formulas (e-1) to (e-3),
Ra 11 and Rb 11 are each independently alkyl having 1 to 10 carbons, and in this alkyl, —CH 2 — may be nonadjacently replaced by —O—, and —(CH 2 ) 2 — may be nonadjacently replaced by —CH═CH—, and hydrogen may be replaced by fluorine;
ring A 11 , ring A 12 , ring A 13 and ring A 14 are each independently trans-1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, pyrimidine-2,5-diyl, pyrimidine-3,6-diyl, 1,3-dioxane-2,5-diyl, 1,3-dioxane-3,6-diyl, tetrahydropyran-2,5-diyl or tetrahydropyran-3,6-diyl; and
Z 11 , Z 12 and Z 13 are each independently a single bond, —CH 2 —CH 2 —, —CH═CH—, —C≡C—, —COO— or —CH 2 O—.
12. The liquid crystal composition according to claim 11 , wherein the content ratio of the first component is in the range of 5% to 60% by weight and the content ratio of the second component is in the range of 40% to 95% by weight, based on the total weight of the liquid crystal composition.
13. The liquid crystal composition according to claim 10 , further comprising a third component which is at least one compound selected from the group of compounds represented by formulas (g-1) to (g-6), in addition to the first and second components:
wherein, in formulas (g-1) to (g-6),
Ra 21 and Rb 21 are each independently hydrogen or alkyl having 1 to 10 carbons, and in the alkyl, —CH 2 — may be nonadjacently replaced by —O—, and —(CH 2 ) 2 — may be nonadjacently replaced by —CH═CH—, and hydrogen may be replaced by fluorine;
ring A 21 , ring A 22 and ring A 23 are each independently trans-1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene, pyrimidine-2,5-diyl, pyrimidine-3,6-diyl, 1,3-dioxane-2,5-diyl, 1,3-dioxane-3,6-diyl, tetrahydropyran-2,5-diyl or tetrahydropyran-3,6-diyl;
Z 21 , Z 22 and Z 23 are each independently a single bond, —CH 2 —CH 2 —, —CH═CH—, —C≡C—, —OCF 2 —, —CF 2 O—, —OCF 2 CH 2 CH 2 —, —CH 2 CH 2 CF 2 O—, —COO—, —OCO—, —OCH 2 — or —CH 2 O—;
Y 1 , Y 2 , Y 3 and Y 4 are each independently fluorine or chlorine;
q, r and s are each independently 0, 1 or 2, q+r is 1 or 2, and q+r+s is 1, 2 or 3; and
t is 0, 1 or 2.
14. The liquid crystal composition according to claim 10 , further comprising a third component which is at least one compound selected from the group of compounds represented by formulas (h-1) to (h-7), in addition to the first and second components:
wherein, in formulas (h-1) to (h-7),
Ra 22 and Rb 22 are each independently straight-chain alkyl having 1 to 8 carbons, straight-chain alkenyl having 2 to 8 carbons or alkoxy having 1 to 7 carbons;
Z 24 , Z 25 and Z 26 are each independently a single bond, —CH 2 CH 2 —, —CH 2 O— or —OCH 2 —; and
Y 1 and Y 2 are simultaneously fluorine, or one of Y 1 and Y 2 is fluorine and the other is chlorine.
15. A liquid crystal composition which has negative dielectric anisotropy, comprising a first component which is at least one compound selected from the compounds according to claim 2 , a second component which is at least one compound selected from the group of compounds represented by formulas (e-1) to (e-3), and a third component which is at least one compound selected from the group of compounds represented by formulas (h-1) to (h-7):
wherein, in formulas (e-1) to (e-3),
Ra 11 and Rb 11 are each independently alkyl having 1 to 10 carbons, and in this alkyl, —CH 2 — may be nonadjacently replaced by —O—, and —(CH 2 ) 2 — may be nonadjacently replaced by —CH═CH—, and hydrogen may be replaced by fluorine;
ring A 11 , ring A 12 , ring A 13 and ring A 14 are each independently trans-1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, pyrimidine-2,5-diyl, pyrimidine-3,6-diyl, 1,3-dioxane-2,5-diyl, 1,3-dioxane-3,6-diyl, tetrahydropyran-2,5-diyl or tetrahydropyran-3,6-diyl; and
Z 11 , Z 12 and Z 13 are each independently a single bond, —CH 2 —CH 2 —, —CH═CH—, —C≡C—, —COO— or —CH 2 O—,
wherein, in formulas (h-1) to (h-7),
Ra 22 and Rb 22 are each independently straight-chain alkyl having 1 to 8 carbons, straight-chain alkenyl having 2 to 8 carbons or alkoxy having 1 to 7 carbons;
Z 24 , Z 25 and Z 26 are each independently a single bond, —CH 2 CH 2 —, —CH 2 O— or —OCH 2 —; and
Y 1 and Y 2 are simultaneously fluorine, or one of Y 1 and Y 2 is fluorine and the other is chlorine.
16. The liquid crystal composition according to claim 13 , wherein the content ratio of the first component is in the range of 5% to 60% by weight, the content ratio of the second component is in the range of 20% to 75% by weight, and the content ratio of the third component is in the range of 20% to 75% by weight, based on the total weight of the liquid crystal composition.
17. A liquid crystal display device containing the liquid crystal composition according to claim 10 .
18. The liquid crystal display device according to claim 17 , wherein the operating mode thereof is a VA mode, a PSA mode or an IPS mode, and the driving mode thereof is an active matrix mode.
19. The compound according to claim 3 , wherein, in formulas (a-11) and (a-14), Z 5 and Z 6 are —(CH 2 ) 2 —.
20. The compound according to claim 4 , wherein, in formulas (a-17), (a-20), (a-23), and (a-26), Z 7 and Z 8 are —CH 2 O—.
21. The liquid crystal composition according to claim 11 , further comprising a third component which is at least one compound selected from the group of compounds represented by formulas (g-1) to (g-6), in addition to the first and second components:
wherein, in formulas (g-1) to (g-6),
Ra 21 and Rb 21 are each independently hydrogen or alkyl having 1 to 10 carbons, and in the alkyl, —CH 2 — may be nonadjacently replaced by —O—, and —(CH 2 ) 2 — may be nonadjacently replaced by —CH═CH—, and hydrogen may be replaced by fluorine;
ring A 21 , ring A 22 and ring A 23 are each independently trans-1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene, pyrimidine-2,5-diyl, pyrimidine-3,6-diyl, 1,3-dioxane-2,5-diyl, 1,3-dioxane-3,6-diyl, tetrahydropyran-2,5-diyl or tetrahydropyran-3,6-diyl;
Z 21 , Z 22 and Z 23 are each independently a single bond, —CH 2 —CH 2 —, —CH═CH—, —C≡C—, —OCF 2 —, —CF 2 O—, —OCF 2 CH 2 CH 2 —, —CH 2 CH 2 CF 2 O—, —COO—, —OCO—, —OCH 2 — or —CH 2 O—;
Y 1 , Y 2 , Y 3 and Y 4 are each independently fluorine or chlorine;
q, r and s are each independently 0, 1 or 2, q+r is 1 or 2, and q+r+s is 1, 2 or 3; and
t is 0, 1 or 2.
22. The liquid crystal composition according to claim 11 , further comprising a third component which is at least one compound selected from the group of compounds represented by formulas (h-1) to (h-7), in addition to the first and second components:
wherein, in formulas (h-1) to (h-7),
Ra 22 and Rb 22 are each independently straight-chain alkyl having 1 to 8 carbons, straight-chain alkenyl having 2 to 8 carbons or alkoxy having 1 to 7 carbons;
Z 24 , Z 25 and Z 26 are each independently a single bond, —CH 2 CH 2 —, —CH 2 O— or —OCH 2 —; and
Y 1 and Y 2 are simultaneously fluorine, or one of Y 1 and Y 2 is fluorine and the other is chlorine.
23. The liquid crystal composition according to claim 14 , wherein the content ratio of the first component is in the range of 5% to 60% by weight, the content ratio of the second component is in the range of 20% to 75% by weight, and the content ratio of the third component is in the range of 20% to 75% by weight, based on the total weight of the liquid crystal composition.
24. The liquid crystal composition according to claim 15 , wherein the content ratio of the first component is in the range of 5% to 60% by weight, the content ratio of the second component is in the range of 20% to 75% by weight, and the content ratio of the third component is in the range of 20% to 75% by weight, based on the total weight of the liquid crystal composition.
25. The liquid crystal composition according to claim 21 , wherein the content ratio of the first component is in the range of 5% to 60% by weight, the content ratio of the second component is in the range of 20% to 75% by weight, and the content ratio of the third component is in the range of 20% to 75% by weight, based on the total weight of the liquid crystal composition.
26. The liquid crystal composition according to claim 22 , wherein the content ratio of the first component is in the range of 5% to 60% by weight, the content ratio of the second component is in the range of 20% to 75% by weight, and the content ratio of the third component is in the range of 20% to 75% by weight, based on the total weight of the liquid crystal composition.