Liquid crystal composition and liquid crystal display device

A liquid crystal composition having a negative dielectric anisotropy and comprising a first component comprising at least one compound selected from the group of compounds represented by formulas (1-1-1), (1-1-2), (1-2-1), (1-2-2), (1-2-3) and (1-3-1) and a second component comprising at least one compound selected from the group of compounds represented by formulas (2-1-1), (2-2-1) and (2-3-1):

• wherein in formulas (1-1-1), (1-1-2), (1-2-1), (1-2-2), (1-2-3), (1-3-1), (2-1-1), (2-2-1) and (2-3-1),
• Ra is independently alkyl or alkenyl;
• Rb is independently alkyl, alkenyl or alkoxy;
• ring A21 is independently 2-fluoro-1,4-phenylene or 3-fluoro-1,4-phenylene;
• ring A22 is independently 1,4-cyclohexylene or 1,4-phenylene;
• ring A23 is 1,4-cyclohexylene or 1,4-phenylene, arbitrary hydrogen of which may be replaced by fluorine;
• and
• Z21 is —CH2O— or —OCH2—.

A liquid crystal composition having a negative dielectric anisotropy and comprising a first component comprising at least one compound selected from the group of compounds represented by formulas (1-1) to (1-3), a second component comprising at least one compound selected from the group of compounds represented by formulas (2-1) to (2-3), and a third component comprising at least one compound selected from the group of compounds represented by formulas (3-1) to (3-3):

• wherein, in formulas (1-1) to (1-3) and formulas (2-1) to (2-3),
• R11 and R12 are independently alkyl, alkenyl or alkoxy;
• ring A11 is independently 2-fluoro-1,4-phenylene or 3-fluoro-1,4-phenylene;
• ring A12 is independently 1,4-cyclohexylene or 1,4-phenylene;
• ring A13 is independently 1,4-cyclohexylene or 1,4-phenylene, arbitrary hydrogen of which may be replaced by fluorine or chlorine;
• and
• Z11 and Z12 are independently a single bond, —C2H4—, —CH2O— or —OCH2—,
• wherein in formulas (3-1) to (3-3),
• Ra is independently alkyl or alkenyl;
• Rb is independently alkyl, alkenyl or alkoxy;
• Rc is alkyl, alkenyl, alkoxy or alkoxymethyl;
• plural rings A22 are independently 1,4-cyclohexylene or 1,4-phenylene;
• and ring A23 is independently 1,4-cyclohexylene or 1,4-phenylene, arbitrary hydrogen of which may be replaced by fluorine;
• and
• Z22 represents a single bond, —CH2O—, —OCH2— or —COO—, provided that
• a compounds represented by formula (1-2), wherein ring A11 is 2-fluoro-1,4-phenylene, ring A12 is 1,4-phenylene, and Z11 and Z12 are single bonds, and a compound represented by formula (1-3), wherein ring A11 is 3-fluoro-1,4-phenylene, ring A12 is 1,4-phenylene, and Z11 and Z12 are single bonds, are excluded.

A liquid crystal composition having a negative dielectric anisotropy and consisting essentially of a first component comprising at least one compound selected from a group of compounds represented by formulas (1-1-1), (1-1-2), (1-2-1), (1-2-2), (1-2-3) and (1-3-1), a second component comprising at least one compound selected from the group of compounds represented by formulas (2-1-1), (2-2-1) and (2-3-1), and a third component comprising at least one compound selected from the group of compounds represented by formulas (3-1) to (3-3):

• wherein in formulas (1-1-1), (1-1-2), (1-2-1), (1-2-2), (1-2-3), (1-3-1), (2-1-1), (2-2-1), (2-3-1) and (3-1) to (3-3),
• Ra is independently alkyl or alkenyl;
• Rb is independently alkyl, alkenyl or alkoxy;
• Rc is alkyl, alkenyl, alkoxy or alkoxymethyl;
• ring A21 is independently 2-fluoro-1,4-phenylene or 3-fluoro-1,4-phenylene;
• ring A22 is independently 1,4-cyclohexylene or 1,4-phenylene;
• ring A23 is 1,4-cyclohexylene or 1,4-phenylene, arbitrary hydrogen of which may be replaced by fluorine;
• and
• Z21 is independently —CH2O— or —OCH2—;
• Z22 is independently a single bond, —CH2O—, —OCH2— or —COO.