Polymerizable compound, and liquid crystal composition and liquid crystal display device using the same

A compound represented by general formula (i):

• wherein
• Ri1 represents a hydrogen atom, P-Sp-, a linear alkyl group having 1 to 30 carbon atoms, a branched alkyl group having 3 to 20 carbon atoms, a linear halogenated alkyl group having 1 to 30 carbon atoms, or a branched halogenated alkyl group having 3 to 20 carbon atoms, any —CH2— group in the alkyl group or the halogenated alkyl group being optionally replaced by —CH═CH—, —C≡C—, —O—, —NH—, —COO—, —OCO—, or —OCOO—, provided that no —O— groups are adjacent to each other;
• ring A and ring C each independently represent a divalent aromatic group, a divalent cyclic aliphatic group, a divalent heterocyclic compound group, a divalent condensed ring, or a divalent condensed polycyclic ring, any hydrogen atom in theses ring structures being optionally replaced by Li1, Li1 representing a halogen atom, a cyano group, a nitro group, P-Sp-, a monovalent organic group having a substituent represented by general formula Ki1, a linear alkyl group having 1 to 30 carbon atoms, or a linear halogenated alkyl group having 1 to 30 carbon atoms, any —CH2— group in the alkyl group or the halogenated alkyl group being optionally replaced by —CH═CH—, —C≡C—, —O—, —NH—, —COO—, —OCO—, or —OCOO—, provided that no —O— groups are adjacent to each other;
• ring B represents a phenylene group or a naphthylene group, ring B having at least two P-Sp- groups;
• Zi1 and Zi2 each independently represent a single bond, —O—, —CH═CH—, —CF═CF—, —C≡C—, —COO—, —OCO—, —OCOO—, —OOCO—, —CF2O—, —OCF2—, —CH═CHCOO—, —OCOCH═CH—, —CH═C(CH3)COO—, —OCOC(CH3)═CH—, —CH2—CH(CH3)COO—, —OCOCH(CH3)—CH2—, —OCH2CH2O—, or an alkylene group having 1 to 10 carbon atoms, one —CH2— group or two or more non-adjacent —CH2— groups in the alkylene group being optionally replaced by —O—, —COO— or —OCO—;
• Zi3 represents a single bond, —O—, —CH═CH—, —COO—, —OCO—, —OCOO—, —OOCO—, —CH═CHCOO—, —OCOCH═CH—, —CH═C(CH3)COO—, —OCOC(CH3)═CH—, —CH2—CH(CH3)COO—, —OCOCH(CH3)—CH2—, or a linear alkylene group having 1 to 20 carbon atoms, one —CH2— group or two or more non-adjacent —CH2— groups in the alkylene group being optionally replaced by —O—, —COO—, or —OCO—;
• and
• Ki1 represents a group represented by any of general formulas (K-1) to (K-17):
• wherein XK1 and YK1 each independently represent —CH2—, an oxygen atom, or a sulfur atom;
• ZK1 represents an oxygen atom or a sulfur atom;
• WK1, UK1, VK1, and SK1 each independently represent a methine group or a nitrogen atom;
• RK1 represents a hydrogen atom or a linear alkyl group having 1 to 6 carbon atoms;
• and TK1 each independently represent a group represented by any of general formulas (T-1) to (T-6):
• wherein ST1 represents a single bond, a linear alkylene group having 1 to 15 carbon atoms, or a linear alkenylene group having 2 to 18 carbon atoms, any —CH2— group in the alkylene group or the alkelene group being optionally replaced by —O—, —COO—, —C(═O)—, —C(═CH2)—, or —OCO—, provided that no oxygen atoms are directly adjacent to each other;
• RT1 represents an alkyl group having 1 to 5 carbon atoms, any —CH2— group in the alkyl group being optionally replaced by —O—, —COO—, —C(═O)—, —C(═CH2)—, or —OCO—, provided that no oxygen atoms are directly adjacent to each other;
• and RT2 and RT3 each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and
• wherein a plurality of P each represent a polymerizable group;
• a plurality of Sp each represent a spacer group or a single bond;
• m represents an integer of 1 to 4;
• n represents 0 or 1;
• P are each independently the same or different;
• S are each independently the same or different;
• when a plurality of A, C, Z1, Z2, and Ki1 are present, they are each independently the same or different;
• and, when Ki1 represents any of general formulas (K-15), (K-16), and (K-17) and each Tk1 represents any of (T-1), (T-4), and (T-5), at least one Sp represents a single bond.