Aromatic isothiocyanates

A liquid crystal medium comprising

• one or more compounds of formula UI-1-3
• in which
• RU denotes H, straight-chain non-fluorinated alkyl having 1 to 12 C atoms, or branched non-fluorinated alkyl having 3 to 12 C atoms, or non-fluorinated alkenyl having 2 to 12 C atoms, in which one or more CH2-groups may be replaced by
• and in which one or more non-adjacent CH2-groups may be replaced by O, or denotes a group R″,
• RP denotes halogen, CN, NCS, fluorinated alkyl, RF—O- or RF—S—,
• RF denotes fluorinated alkyl having 1 to 9 C atoms or fluorinated alkenyl having 2 to 9 C atoms;
• and
• one or more compounds of formula UII
• in which
• RU denotes H, a straight-chain alkyl having 1 to 12 C atoms or branched alkyl having 3 to 12 C atoms or alkenyl having 2 to 12 C atoms, in which one or more CH2-groups may be replaced by
• and in which one or more non-adjacent CH2-groups may be replaced by O, or denotes a group RP,
• RP denotes halogen, CN, NCS, RF—, RF—O- or RF—S—,
• RF denotes fluorinated alkyl having 1 to 9 C atoms or fluorinated alkenyl having 2 to 9 C atoms,
• ZU1, ZU2 identically or differently, denote —CH═CH—, —CF═CF—, —CH═CF—, —CF═CH—, —C═C—, —C═C—C═C- or a single bond,
• XU1, XU2, identically or differently, denote Cl or F,
• each independently denote:
• a) 1,4-phenylene, 1,4-naphthylene or 2,6-naphthylene, in which one or two CH groups may be replaced by N and in which one or more H atoms may be replaced by L,
• b) trans-1,4-cyclohexylene, 1,4-cyclohexenylene, tetralin-2,6-diyl, tetralin-5,8-diyl, decalin-2,6-diyl, bicyclo[1.1.1]pentane-1,3-diyl, 4,4′-bicyclohexylene, bicyclo[2.2.2]octane-1,4-diyl or spiro [3.3]heptane-2,6-diyl, in which one or two CH groups may be replaced by N, one or more non-adjacent CH2 groups may be replaced by —O— and/or —S— and in which one or more H atoms may be replaced by L, or
• c) thiophene-2,5-diyl, thieno [3,2-b]thiophene-2,5-diyl or selenophene-2,5-diyl, each of which may also be mono- or polysubstituted by L,
• L on each occurrence, identically or differently, denotes F, Cl, CN, SCN, SF5 or a straight-chain, in each case optionally fluorinated, alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy each having 1 to 12 C atoms, or branched, in each case optionally fluorinated, alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy each having 3 to 12 C atoms, and atoms, and
• u is 0, 1 or 2,
• from which the compounds of formula UI-1-3 are excluded,
• and
• one or more compounds selected from the group of compounds of formulae UI-1, UI-2 and UI-3
• from which compounds of formulae UI-1, the compounds
• of formula UI-1-3 are excluded
• in which
• RU denotes H, straight-chain non-fluorinated alkyl having 1 to 12 C atoms, or branched non-fluorinated alkyl having 3 to 12 C atoms, or non-fluorinated alkenyl having 2 to 12 C atoms, in which one or more CH2-groups may be replaced by
• and in which one or more non-adjacent CH2-groups may be replaced by O, or denotes a group RP,
• RP denotes halogen, CN, NCS, fluorinated alkyl, RF—O- or RF—S—,
• RF denotes fluorinated alkyl having 1 to 9 C atoms or fluorinated alkenyl having 2 to 9 C atoms;
• XU1, XU2 identically or differently, denote Cl or F,
• each independently denote:
• a) 1,4-phenylene, 1,4-naphthylene or 2,6-naphthylene, in which one or two CH groups may be replaced by N and in which one or more H atoms may be replaced by L,
• b) trans-1,4-cyclohexylene, 1,4-cyclohexenylene, tetralin-2,6-diyl, tetralin-5,8-diyl, decalin-2,6-diyl, bicyclo[1.1.1]pentane-1,3-diyl, 4,4′-bicyclohexylene, bicyclo[2.2.2]octane-1,4-diyl or spiro [3.3]heptane-2,6-diyl, in which one or two CH groups may be replaced by N, one or more non-adjacent CH2 groups may be replaced by —O— and/or —S— and in which one or more H atoms may be replaced by L, or
• c) thiophene-2,5-diyl, thieno [3,2-b]thiophene-2,5-diyl or selenophene-2,5-diyl, each of which may also be mono- or polysubstituted by L,
• L on each occurrence, identically or differently, denotes F, Cl, CN, SCN, SF5 or a straight-chain, in each case optionally fluorinated, alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy each having 1 to 12 C atoms, or a branched, in each case optionally fluorinated, alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy each having 3 to 12 C atoms;
• with the proviso that in formula UI-3 at least one of
• and
• denotes trans-1,4-cyclohexylene, 1,4-cyclohexenylene, tetralin-2,6-diyl, tetralin-5,8-diyl, decalin-2,6-diyl, bicyclo[1.1.1]pentane-1,3-diyl, 4,4′-bicyclohexylene, bicyclo[2.2.2]octane-1,4-diyl, and spiro [3.3]heptane-2,6-diyl, in which one or two CH groups may be replaced by N, one or more non-adjacent CH2 groups may be replaced by —O— and/or —S— and in which one or more H atoms may be replaced by L, wherein L, on each occurrence, identically or differently, denotes F, Cl, CN, SCN, SF5 or a straight-chain, in each case optionally fluorinated, alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy each having 1 to 12 C atoms or a branched, in each case optionally fluorinated, alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkyl-carbonyloxy or alkoxycarbonyloxy each having 1 to 12 C atoms,
• wherein the medium contains the one or more compounds selected from the group of compounds of formulae UI-1, UI-2 and UI-3, the one or more compounds of formula UI-1-3 and the one or more compounds of formula UII in a total concentration of 15% to 50%;
• and
• one or more compounds of formula III-1b:
• R3 denotes H, unfluorinated alkyl or unfluorinated alkoxy having 1 to 17 C atoms, or unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl having 2 to 15 C atoms, in which one or more CH2-groups may be replaced by
• and
• one or more compounds of formulae I, II and/or III, wherein from the compounds of formula III the compounds of formula III-1b are excluded:
• in which
• R1 denotes H, unfluorinated alkyl or unfluorinated alkoxy having 1 to 17 C atoms, or unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl having 2 to 15 C atoms, in which one or more CH2-groups may be replaced by
• n is 0, 1 or 2,
• on each occurrence, independently of one another, denote
• in which
• RL, on each occurrence, identically or differently, denotes H
• or alkyl having 1 to 6 C atoms,
• or
• in which one or more H atoms may be replaced by alkyl having 1 to 6 C atoms or F,
• and wherein
• alternatively denotes
• R2 denotes H, unfluorinated alkyl or unfluorinated alkoxy having 1 to 17 C atoms, or unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl having 2 to 15 C atoms, in which one or more CH2-groups may be replaced by
• Z21 denotes trans-CH═CH—, trans-CF═CF— or —C≡C—, and
• independently of one another, denote
• in which RL, on each occurrence, identically or differently,
• denotes H or alkyl having 1 to 6 C atoms,
• or
• in which one or more H atoms may be replaced by alkyl having 1 to 6 C atoms or F,
• R3 denotes H, unfluorinated alkyl or unfluorinated alkoxy having 1 to 17 C atoms, or unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl having 2 to 15 C atoms, in which one or more CH2-groups may be replaced by
• one of Z31 and Z32 denotes trans-CH═CH—, trans-CF═CF— or —C═C— and the other one, independently thereof, denotes —C≡C—, trans-CH═CH—, trans-CF═CF- or a single bond, and
• independently of one another, denote
• in which RL, on each occurrence, identically or differently, denotes H or alkyl having 1 to 6 C atoms,
• or
• in which one or more H atoms may be replaced by alkyl having 1 to 6 C atoms or F,
• and wherein
• alternatively denotes