Liquid crystal mixture

Chiral smectic liquid crystal mixture comprising one or several compounds of formula (IV)

• wherein
• R1:
• is H, or a linear or branched alkyl group of 1 to 20 or a linear or branched alkenyl group of 2 to 20 C atoms, wherein in either case optionally one —CH2— group being replaced by cyclohexylen-1,4-diyl, or one or two —CH2— groups optionally being replaced by —O—, if non-adjacent to N, or by —C(═O)—, —Si(CH3)2—,
• and/or one or more H of the alkyl or alkenyl group optionally being replaced by F or CH3;
• R2:
• stands for
• a) H or F,
• b) a linear or branched alkyl group of 1 to 20 or a linear or branched alkenyl group of 2 to 20 C atoms, wherein in either case one or two —CH2— groups optionally being replaced by —O—, —C(═O)O—, —Si(CH3)2—, and/or one or more H of the alkyl or alkenyl group being replaced by F or CH3,
• c) a radical
• wherein independently from the respective meanings in (I)
• R3, R4, R5, R6:
• are independently from another an alkyl group of 1 to 8 C atoms;
• M1, M2:
• represent independently from another a single bond, —OC(═O)—, —C(═O)O—, —OCH2—, —NH—;
• A:
• is
• a) a linear or branched alkan-α,ω-diyl group of 1 to 20 or alkene-α,ω-diyl group of 2 to 20 C atoms, optionally, if non-adjacent to M1 and M2, one or two non-adjacent —CH2— groups may be replaced by —O—,
• b) the group —C(═Y)— wherein Y is CH-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogen atoms, alkyl or alkyloxy groups of 1 to 4 C atoms, with the proviso that M1 and M2 are —C(═O)O— and —OC(═O)—,
• c) the group —CHY wherein Y is CH2-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogen atoms, alkyl or alkyloxy groups of 1 to 4 C atoms, with the proviso that M1 and M2 are —C(═O)O— and —OC(═O)—,
• d) a group
• wherein p, q are 1 or 2, the sum of p+q being ≧1;
• M3 is a single bond or —OC(═O)—, —C(═O)O—, —OCH2—, —CH2O—, —C≡C—, —CH2CH2—, —CH2CH2CH2CH2—;
• the radicals
• are independently from another phenylen-1,4-diyl, which optionally can be substituted by one, two or three F, or cyclohexan-1,4-diyl, which can optionally be substituted by one CN, CH3 or F, or pyrimidin-2,5-diyl, optionally substituted by one F, pyridine-2,5-diyl, which can optionally be substituted by one F, or naphthalene-2,8-diyl, which can optionally be substituted by one, two or three F, or 1,2,3,4-tetrahydronaphthalene-2,6-diyl (the aromatic ring optionally substituted by one, two or three F), or decahydronaphthalene-2,6-diyl, or indane-2,5(6)-diyl, or fluorene-2,-7-diyl, or phenanthrene-2,7-diyl, or 9,10-dihydrophenanthrene-2,7-diyl, or (1,3,4)thiadiazol-2,5-diyl, or (1,3)thiazol-2,5-diyl, or (1,3)thiazol-2,4-diyl, or thiophen-2,4-diyl, or thiophen-2,5-diyl, or (1,3)dioxan-2,5-diyl, or piperidin-1,4-diyl, or piperazin-1,4-diyl;
• X is H, OH, a linear or branched alkyl or alkyloxy group of 1 to 20 C atoms, wherein one or two —CH2— groups can be replaced by —O—, —C(═O)O—, —Si(CH3)2—, optionally one or more H being replaced by F or CH3;
• m:
• is 0 or 1;
• and M1 is a single bond.

Chiral smectic liquid crystal mixture comprising at least two compounds of formula (I) and/or (IV)

• wherein
• R1:
• is H or a linear or branched alkyl group of 1 to 20 or a linear or branched alkenyl group of 2 to 20 C atoms, wherein in either case optionally one —CH2— group being replaced by cyolohexylen-1,4-diyl, or one or two —CH2— groups optionally being replaced by —O—, if non-adjacent to N, or by —C(═O)—, —Si(CH3)2—,
• and/or one or more H of the alkyl or alkenyl group optionally being replaced by F or CH3;
• R2:
• stands for
• a) H or F,
• b) a linear or branched alkyl group of 1 to 20 or a linear or branched alkenyl group of 2 to 20 C atoms, wherein in either case one or two —CH2— groups optionally being replaced by —O—, —C(═O)O—, —Si(CH3)2—, and/or one or more H of the alkyl or alkenyl group being replaced by F or CH3,
• c) a radical
• wherein independently from the respective meanings in (I)
• R3, R4, R5, R6:
• are independently from another an alkyl group of 1 to 8 C atoms;
• M1, M2:
• represent independently from another a single bond, —OC(═O)—, —C(═O)O—, —OCH2—, —NH—;
• A:
• is
• a) a linear or branched alkan-α,ω-diyl group of 1 to 20 or alkene-α,ω-diyl group of 2 to 20 C atoms, optionally, if non-adjacent to M1 and M2, one or two non-adjacent —CH2— groups may be replaced by —O—,
• b) the group —C(═Y)— wherein Y is CH-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogen atoms, alkyl or alkyloxy groups of 1 to 4 C atoms, with the proviso that M1 and M2 are —C(═O)O— and —OC(═O)—,
• c) the group —CHY wherein Y is CH2-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogen atoms, alkyl or alkyloxy groups of 1 to 4 C atoms, with the proviso that M1 and M2 are —C(═O)O— and —OC(═O)—,
• d) a group
• wherein p, q are 1 or 2, the sum of p+q being ≧1;
• M3 is a single bond or —OC(═O)—, —C(═O)O—, —OCH2—, —CH2O—, —C≡C—, —CH2CH2—, —CH2CH2CH2CH2—;
• the radicals
• are independently from another phenylen-1,4-diyl, which optionally can be substituted by one, two or three F, or cyclohexan-1,4-diyl, which can optionally be substituted by one CN, CH3 or F, or pyrimidin-2,5-diyl, optionally substituted by one F, pyridine-2,5-diyl, which can optionally be substituted by one F, or naphthalene-2,6-diyl, which can optionally be substituted by one, two or three F, or 1,2,3,4-tetrahydronaphthalene-2,6-diyl (the aromatic ring optionally substituted by one, two or three F), or decahydronaphthalene-2,6-diyl, or indane-2,5(6)-diyl, or fluorene-2,-7-diyl, or phenanthrene-2,7-diyl, or 9,10-dihydrophenanthrene-2,7-diyl, or (1,3,4)thiadiazol-2,5-diyl, or (1,3)thiazol-2,5-diyl, or (1,3)thiazol-2,4-diyl, or thiophen-2,4-diyl, or thiophen-2,5-diyl, or (1,3)dioxan-2,5-diyl, or piperidin-1,4-diyl, or piperazin-1,4-diyl;
• X is H, OH, a linear or branched alkyl or alkyloxy group of 1 to 20 C atoms, wherein one or two —CH2— groups can be replaced by —O—, —C(═O)O—, —Si(CH3)2—, optionally one or more H being replaced by F or CH3;
• m:
• is 0 or 1;
• X and M1-(A)m-M2-R2 together can constitute
• a) a ring of 4 to 16 members, optionally substituted by an alkyl radical of 1 to 15 C atoms,
• b) a combination of two either directly linked or spiro-linked rings of independently from another 4 to 16 members, optionally substituted by an alkyl radical of 1 to 15 C atoms in either of the three variants the rings independently from another being carbocycles or carbocycles comprising B, N, O or S heteroatoms;
• and
• wherein
• wherein
• R1:
• is H or a linear or branched alkyl group of 1 to 20 or a linear or branched alkenyl group of 2 to 20 C atoms, wherein in either case optionally one —CH2— group being replaced by cyclohexylen-1,4-diyl, or one or two —CH2— groups optionally being replaced by —O—, if non-adjacent to N, or by —C(═O)—, —Si(CH3)2—,
• and/or one or more H of the alkyl or alkenyl group optionally being replaced by F or CH3;
• R2:
• stands for
• a) H or F,
• b) a linear or branched alkyl group of 1 to 20 or a linear or branched alkenyl group of 2 to 20 C atoms, wherein in either case one or two —CH2— groups optionally being replaced by —O—, —C(═O)O—, —Si(CH3)2—, and/or one or more H of the alkyl or alkenyl group being replaced by F or CH,
• c) a radical
• wherein independently from the respective meanings in (I)
• R3, R4, R5, R6:
• are independently from another an alkyl group of 1 to 8 C atoms;
• M1, M2:
• represent independently from another a single bond, —OC(═O)—, —C(═O)O—, —OCH2—, —NH—;
• A:
• is
• a) a linear or branched alkan-α,ω-diyl group of 1 to 20 or alkene-α,ω-diyl group of 2 to 20 C atoms, optionally, if non-adjacent to M1 and M2, one or two non-adjacent —CH2— groups may be replaced by —O—,
• b) the group —C(═Y)— wherein Y is CH-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogen atoms, alkyl or alkyloxy groups of 1 to 4 C atoms, with the proviso that M1 and M2 are —C(═O)O— and —OC(═O)—,
• c) the group —CHY wherein Y is CH2-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogen atoms, alkyl or alkyloxy groups of 1 to 4 C atoms, with the proviso that M1 and M2 are —C(═O)O— and —OC(═O)—,
• d) a group
• wherein p, q are 1 or 2, the sum of p+q being ≧1;
• M3 is a single bond or —OC(═O), —C(═O)O—, —OCH2—, —CH2O—, —C≡C—, —CH2CH2—, —CH2CH2CH2CH2—;
• the radicals
• are independently from another phenylen-1,4-diyl, which optionally can be substituted by one, two or three F, or cyclohexan-1,4-diyl, which can optionally be substituted by one CN, CH3 or F, or pyrimidin-2,5-diyl, optionally substituted by one F, pyridine-2,5-diyl, which can optionally be substituted by one F, or naphthalene-2,6-diyl, which can optionally be substituted by one, two or three F, or 1,2,3,4-tetrahydronaphthalene-2,6-diyl (the aromatic ring optionally substituted by one, two or three F), or decahydronaphthalene-2,6-diyl, or indane-2,5(6)-diyl, or fluorene-2,-7-diyl, or phenanthrene-2,7-diyl, or 9,10-dihydrophenanthrene-2,7-diyl, or (1,3,4)thiadiazol-2,5-diyl, or (1,3)thiazol-2,5-diyl, or (1,3)thiazol-2,4-diyl, or thiophen-2,4-diyl, or thiophen-2,5-diyl, or (1,3)dioxan-2,5-diyl, or piperidin-1,4-diyl, or piperazin-1,4-diyl;
• X is H, OH, a linear or branched alkyl or alkyloxy group of 1 to 20 C atoms, wherein one or two —CH2— groups can be replaced by —O—, —C(═O)O—, —Si(CH3)2—, optionally one or more H being replaced by F or CH3;
• m:
• is 0 or 1;
• and M1 is a single bond.

Compounds of the formula (II)

• wherein
• R1 is H or alkyl of 1 to 12 C atoms;
• R2 is H a linear or branched alkyl group of 1 to 16 or linear or branched alkenyl group of 2 to 16 C atoms, wherein in either case one —CH2— group can be replaced by —O—, it also being possible to replace one or more H by F;
• M1 is —OC(═O)— or a single bond;
• M3 is a single bond;
• G1-G2 is —CH2—CH— or —CH═C—,
• p is 0 or 1;
• is phenylen-1,4-diyl, optionally substituted by one or two F, cyclohexylen-1,4-diyl, biphenyl-4,4′-diyl, optionally substituted by one or two F per ring, 1,1′-cyclohexyl-phenyl-4,4′-diyl, the phenyl moiety optionally substituted by one or two F, or 1,1′-phenylcyclohexyl-4,4′-diyl, the phenyl moiety optionally substituted by one or two F, or 1,1′-bicyclohexyl-4,4′-diyl;
• is phenylen-1,4-diyl, optionally substituted by one or two F, or cyolohexylen-1,4-diyl, with the provisos
• a) R2 is H only in case p is 1,
• b) if p is 0, than R2 is a linear or branched alkyl group of 1 to 16 or linear or branched alkenyl group of 2 to 16 C atoms and
• is cyclohexylen-1,4-diyl,
• c) -G1-G2- can be —CH═C— only in case M1 is a single bond.

Compounds of the formula (III)

• wherein R1 is H or alkyl of 1 to 12 C atoms:
• R2 is H, a linear or branched alkyl group of 1 to 16 or linear or branched alkenyl group of 2 to 16 C atoms, wherein in either case one —CH2— group can be replaced by —O—, it also being possible to replace one or more H by F;
• M1 is —OC(═O)— or a single bond;
• M3 is a single bond;
• G1-G2 is —CH2—CH— or —CH═C—,
• p is 0 or 1;
• is pyrimidin-2,5-diyl, pyridin-2,5-diyl, optionally ortho to N substituted by F, phenylen-1,4-diyl, optionally substituted by one or two F, or cyclohexylen-1,4-diyl, biphenyl-4,4′-diyl, optionally substituted by one or two F per ring, 1,1′-cyclohexylphenyl-4,4′-diyl, the phenyl moiety optionally substituted by one or two F, or 1,1′-phenylcyclohexyl-4,4′diyl, the phenyl moiety optionally substituted by one or two F, or 1,1′-bicyclohexyl-4,4′diyl;
• is phenylen-1,4-diyl, optionally substituted by one or two F, cyclohexylen-1,4-diyl, biphenyl-4,4′-diyl, optionally substituted by one or two F per ring, 1,1′-cyclohexylphenyl-4,4′-diyl, the phenyl moiety optionally substituted by one or two F, or 1,1′-phenylcyclohexyl-4,4′-diyl the phenyl moiety optionally substituted by one or two F, or 1,1′-bicyclohexyl-4,4′-diyl, pyrimidin-2,5-diyl, or pyridin-2,5-diyl, optionally ortho to N substituted by F,
• with the provisos
• a) one and only one of
• is pyrimidin-2,5-diyl or pyridin-2,5-diyl, optionally ortho to N substituted by F,
• b) -G1-G2- can be —CH═C— only in case M1 is a single bond.