| 摘要 |
The invention relates to compounds of the formula I, and to a liquid-crystalline medium, preferably having a nematic phase and negative dielectric anisotropy, which comprises one or more compounds of formula I, defined herein, for use in an electro-optical display, particularly in an active-matrix display based on the VA, ECB, PALC, FFS or IPS effect, and to the use of the compounds of the formula I for the stabilization of a liquid-crystalline medium which comprises one or more compounds of the formula II and one or more compounds of the formulae III-1 to III-4, defined herein. |
| 主权项 |
1. A compound according to formula Iin which
n denotes 2, 3, or 4, m denotes (4-n), denotes an organic radical having 4 bonding sites, Z11 and Z12, independently of one another, denote —O—, —(C═O)—, —(N—R14)— or a single bond, but do not both simultaneously denote —O—, r and s, independently of one another, denote 0 or 1, Y11 to Y14 each, independently of one another, denote alkyl having 1 to 4 C atoms, or alternatively, independently from each other, the two pairs (Y11 and Y12) and (Y13 and Y14) may be connected by a bond to form together a divalent group having 3 to 6 C-atoms R11 in each case, denotes O—R13, O. or OH, wherein at least one R11 is O—R13. or OH, or in case n is 3 or 4, all R11 can be O., R12 on each occurrence, independently of one another, denotes H, F, OR14, NR14R15, a straight-chain or branched alkyl chain having 1-20 C atoms, in which one —CH2— group or a plurality of —CH2-groups may each be replaced by —O— or —C(═O)—, but two adjacent —CH2— groups cannot be replaced by —O—, or denotes a hydrocarbon radical which contains a cycloalkyl or alkylcycloalkyl unit, and in which one —CH2— group or a plurality of —CH2— groups may each be replaced by —O— or —C(═O)—, but two adjacent —CH2— groups cannot be replaced by —O—, and in which one H atom or a plurality of H atoms may each be replaced by OR14, N(R14)(R15) or R16, or denotes an aromatic or heteroaromatic hydrocarbon radical, in which one H atom or a plurality of H atoms may each be replaced by OR14, N(R14)(R15) or R16, R13 on each occurrence, independently of one another, denotes a straight-chain or branched alkyl chain having 1-20 C atoms, in which one —CH2— group or a plurality of —CH2— groups may each be replaced by —O— or —C(═O)—, but two adjacent —CH2— groups cannot be replaced by —O—, or denotes a hydrocarbon radical which contains a cycloalkyl or alkylcycloalkyl unit, and in which one —CH2— group or a plurality of —CH2— groups may each be replaced by —O— or —C(═O)—, but two adjacent —CH2— groups cannot be replaced by —O—, and in which one H atom or a plurality of H atoms may each be replaced by OR14, N(R14)(R15) or R16, or denotes an aromatic or heteroaromatic hydrocarbon radical, in which one H atom or a plurality of H atoms may each be replaced by OR14, N(R14)(R15) or R16,
or can be (1,4-cyclohexyl), in which one or more —CH2-groups may each be replaced by —O—, —CO— or —NR14—, or an acetophenyl, isopropyl or 3-heptyl radical, R14 on each occurrence, independently of one another, denotes a straight-chain or branched alkyl or acyl group having 1 to 10 C atoms or an aromatic hydrocarbon or carboxyl radical having 6-12 C atoms, R15 on each occurrence, independently of one another, denotes a straight-chain or branched alkyl or acyl group having 1 to 10 C atoms or an aromatic hydrocarbon or carboxyl radical having 6-12 C atoms, R16 on each occurrence, independently of one another, denotes a straight-chain or branched alkyl group having 1 to 10 C atoms, in which one —CH2— group or a plurality of —CH2— groups may each be replaced by —O— or —C(═O)—, but two adjacent —CH2— groups cannot be replaced by —O—, with the provisos that, in the case where n=2 and R11=O—R13, then R13 does not denote n-C1-9-alkyl. |
