Compounds of the formula I in which A 3 denotes L 1, L 2, independently of one another, denote a group L or H, L 3, L 4, independently of one another, denote a group L or H, L independently denotes branched or unbranched alkyl having 1 to 12 C atoms, alkenyl or alkynyl having 2 to 12 C atoms, in which in each case, independently of one another, one or more hydrogen atoms may be replaced by F or Cl and, in addition, one or more non-terminal "-CH 2 -" groups may be replaced by O, or denotes C 3 -C 6 cycloalkyl or C 3 -C 6 cycloalkenyl, F, Cl, Br, CN, NCS, SCN or SF 5, Q denotes S or O, A 2 and A 4 denote a 1,4-phenylene ring which is optionally substituted by a group L, A 1, A 5 each, independently of one another, denote a) 1,4-phenylene, in which one or more CH groups may be replaced by N, b) a radical from the group thiophene-2,5-diyl or furan-2,5- diyl or c) trans-1,4-cyclohexylene or cyclohexenylene, in which, in addition, one or two non-adjacent CH 2 groups may be replaced by -O- and/or -S-, and in which H may be replaced by F, or denote 1,4-bicyclo[2.2.2]octylene, cyclobutane-1,3-diyl or spiro[3.3]heptane-2,6-diyl, and in which, in groups a), b) and c), one or more H atoms may also be substituted by a group as defined for L, Z 2 denotes -C≡C- or Y 1, Y 2, independently of one another, denote H, F, Cl, C 1 -C 10 alkyl, where at least one group from Y 1 and Y 2 denotes F, Z 1, Z 5, independently of one another, denote a single bond, -C≡C-, -CH=CH-, -CH 2 O-, - O-, -CF 2 O-, -CF 2 CF 2 -, -CH 2 CF 2 -, -CH 2 CH 2 -, -(CH 2) 4 -, -CH=CF- or -CF=CF-, where asymmetrical bridges may be oriented towards both sides, R 1 and R 2, independently of one another, denote a halogenated or unsubstituted alkyl radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals may each be replaced, independently of one another, by -C≡C-, -CH=CH-, -CF=CF-, -CF=CH-, -CH=CF-, - - and -O- in such a way that O atoms are not linked directly to one another, or denote F, Cl, Br, CN, CF 3, OCF 3, NCS, SCN or SF 5, R 2 also denotes H, m, n, independently of one another, denote 0, 1 or 2, and p denotes 1 or 2. A 3 denotes L 1, L 2, independently of one another, denote a group L or H, L 3, L 4, independently of one another, denote a group L or H, L independently denotes branched or unbranched alkyl having 1 to 12 C atoms, alkenyl or alkynyl having 2 to 12 C atoms, in which in each case, independently of one another, one or more hydrogen atoms may be replaced by F or Cl and, in addition, one or more non-terminal "-CH 2 -" groups may be replaced by O, or denotes C 3 -C 6 cycloalkyl or C 3 -C 6 cycloalkenyl, F, Cl, Br, CN, NCS, SCN or SF 5, Q denotes S or O, A 2 and A 4 denote a 1,4-phenylene ring which is optionally substituted by a group L, A 1, A 5 each, independently of one another, denote a) 1,4-phenylene, in which one or more CH groups may be replaced by N, b) a radical from the group thiophene-2,5-diyl or furan-2,5- diyl or c) trans-1,4-cyclohexylene or cyclohexenylene, in which, in addition, one or two non-adjacent CH 2 groups may be replaced by -O- and/or -S-, and in which H may be replaced by F, or denote 1,4-bicyclo[2.2.2]octylene, cyclobutane-1,3-diyl or spiro[3.3]heptane-2,6-diyl, and in which, in groups a), b) and c), one or more H atoms may also be substituted by a group as defined for L, a) 1,4-phenylene, in which one or more CH groups may be replaced by N, b) a radical from the group thiophene-2,5-diyl or furan-2,5- diyl or c) trans-1,4-cyclohexylene or cyclohexenylene, in which, in addition, one or two non-adjacent CH 2 groups may be replaced by -O- and/or -S-, and in which H may be replaced by F, or denote 1,4-bicyclo[2.2.2]octylene, cyclobutane-1,3-diyl or spiro[3.3]heptane-2,6-diyl, Z 2 denotes -C≡C- or Y 1, Y 2, independently of one another, denote H, F, Cl, C 1 -C 10 alkyl, where at least one group from Y 1 and Y 2 denotes F, Z 1, Z 5, independently of one another, denote a single bond, -C≡C-, -CH=CH-, -CH 2 O-, - O-, -CF 2 O-, -CF 2 CF 2 -, -CH 2 CF 2 -, -CH 2 CH 2 -, -(CH 2) 4 -, -CH=CF- or -CF=CF-, where asymmetrical bridges may be oriented towards both sides, R 1 and R 2, independently of one another, denote a halogenated or unsubstituted alkyl radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals may each be replaced, independently of one another, by -C≡C-, -CH=CH-, -CF=CF-, -CF=CH-, -CH=CF-, - - and -O- in such a way that O atoms are not linked directly to one another, or denote F, Cl, Br, CN, CF 3, OCF 3, NCS, SCN or SF 5, R 2 also denotes H, m, n, independently of one another, denote 0, 1 or 2, and p denotes 1 or 2.