Liquid-crystalline mixtures

A switchable window comprising:

• a layer which comprises a mixture comprising one or more compounds of formula (1) or a formula (2),
• where:
• A11, A12, A21, A22, A23, A24 are from
• Z11, Z21, Z22, Z23 are a single bond, —(C═O)—O, —O—(C═O)—, —CF2—O—, —O—CF2—, —O—CH2—, —CH2—O— or —CH2—CH2—;
• R11, R12, R21, R22 are on each occurrence, identically or differently, H, F, Cl, CN, NCS, alkyl groups having 1 to 10 C atoms, alkoxy groups having 1 to 10 C atoms, thioalkoxy groups having 1 to 10 C atoms, alkenyl groups having 2 to 10 C atoms and alkenyloxy groups having 2 to 10 C atoms, where one or more H atoms in the alkyl, alkoxy, thioalkoxy, alkenyl a or alkenyloxy groups may be replaced by F, Cl or CN;
• T is —CN, F, —N3, —NCS, NO2, —C≡C—R3, alkyl groups having 1 to 10 C atoms or alkoxy groups having 1 to 10 C atoms, where one or more H atoms in the alkyl and alkoxy groups may be replaced by F, Cl or CN;
• R3 is H, CN, alkyl groups having 1 to 10 C atoms, where one or more C atoms in the alkyl groups may be replaced by F, Cl or CN, or —C≡C—R4;
• R4 is H, CN, or alkyl groups having 1 to 10 C atoms, where one or more C atoms in the alkyl groups may be replaced by F, Cl or CN;
• i is on each occurrence, identically or differently, 0 or 1, where the sum of the indices i in a formula is at least equal to 1;
• k is on each occurrence, identically or differently, 0 or 1, where the sum of the indices k in a formula is at least equal to 1;
• p is equal to 0 or 1;
• and one or more compounds of the formula (3)
• wherein
• A31 is on each occurrence, identically or differently,
• R31 and R32 are on each occurrence, identically or differently, H, F, Cl, CN, NCS, alkyl groups having 1 to 10 C atoms, alkoxy groups having 1 to 10 C atoms, thioalkoxy groups having 1 to 10 C atoms, alkenyl groups having 2 to 10 C atoms and alkenyloxy groups having 2 to 10 C atoms, where one or more H atoms in the alkyl, alkoxy, thioalkoxy, alkenyl or alkenyloxy groups may be replaced by F, Cl or CN;
• Z31 is on each occurrence, identically or differently, a single bond, —(C═O)—O—, —O—(C═O)—, —CF2—O—, —O—CF2—, —O—CH2—, —CH2—O— or —CH2—CH2—;
• m is equal to 0, 1, 2 or 3;
• where the sum of the proportions of the compounds of the formula (1), the compounds of the formula (2) and the compounds of the formula (3) in the mixture is at least 58%,
• and where one or both of the following conditions a) and b) are satisfied:
• a) the mixture comprises one or more compounds V which contain four or more rings,
• b) the mixture comprises a proportion of at least 25% of compounds of the formula (2)
• and
• wherein said layer is present in a switchable window and said mixture has a clearing point of at least 105° C.