Materials for organic electroluminescent devices

An electronic device comprising a compound of the formula (1)

• where the following applies to the symbols and indices used:
• X is C═O, C(R)2, NR, O, S, C═S, C═NR, C═C(R)2, Si(R)2, BR, PR, P(═O)R, SO or SO2;
• Y is, identically or differently, W, as defined below, or is NR, O or S, with the proviso that Y═C if a group E is bonded to the group Y;
• W is on each occurrence, identically or differently, CR or N, with the proviso that not more than three groups W in a ring stand for N, and with the further proviso that W═C if a group E is bonded to this group W;
• Z is, identically or differently on each occurrence, CR or N;
• or two adjacent groups Z stand for a group of the formula (2)
• in which the dashed bonds indicate the linking of this unit;
• E is, identically or differently on each occurrence, a single bond, C(R)2, NR, O, S, C═O, C═S, C═NR, C═C(R)2, Si(R)2, BR, PR, P(═O)R, SO or SO2;
• Ar is, together with the group Y and the two carbon atoms, an aryl or heteroaryl group having 5 to 30 aromatic ring atoms, which is optionally substituted by one or more radicals R;
• A is R if m=n=0, and is an aryl or heteroaryl group having 5 to 30 aromatic ring atoms, which may in each case be substituted by R, or a group —CR═CR—, —CR═N— or —N═N— if an index m or n=1 and the other index m or n=0, or is an aryl or heteroaryl group having 5 to 30 aromatic ring atoms, which may in each case be substituted by R, if the indices m=n=1;
• R is selected on each occurrence, identically or differently, is H, D, F, Cl, Br, I, CN, NO2, N(Ar1)2, NR12, C(═O)Ar1, C(═O)R1, P(═O)Ar1)2, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 40 C atoms or a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 40 C atoms or an alkenyl or alkynyl group having 2 to 40 C atoms, each of which is optionally substituted by one or more radicals R1, where one or more non-adjacent CH2 groups is optionally replaced by R1C═CR1, C≡C, SiR12, Ge(R1)2, Sn(R1)2, C═O, C═S, C═Se, C═NR1, P(═O)(R1), SO, SO2, NR1, O, S or CONR1 and where one or more H atoms is optionally replaced by D, F, Cl, Br, I, CN or NO2, an aromatic or heteroaromatic ring system having 5 to 80 aromatic ring atoms, which is optionally in each case be substituted by one or more radicals R1, an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which is optionally substituted by one or more radicals R1, or a combination of these systems, where two or more adjacent substituents R may optionally form a monocyclic or polycyclic, aliphatic, aromatic or heteroaromatic ring system, which is optionally substituted by one or more radicals R1;
• R1 is selected on each occurrence, identically or differently, is H, D, F, Cl, Br, I, CN, NO2, N(Ar1)2, N(R2)2, C(═O)Ar, C(═O)R2, P(═O)Ar1)2, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 40 C atoms or a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 40 C atoms or an alkenyl or alkynyl group having 2 to 40 C atoms, each of which is optionally substituted by one or more radicals R2, where one or more non-adjacent CH2 groups is optionally replaced by R2C═CR2, C≡C, Si(R2)2, Ge(R2)2, Sn(R2)2, C═O, C═S, C═Se, C═NR2, P(═O)(R2), SO, SO2, NR2, O, S or CONR2 and where one or more H atoms is optionally replaced by D, F, Cl, Br, I, CN or NO2, an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which is optionally in each case be substituted by one or more radicals R2, an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which is optionally substituted by one or more radicals R2, or a combination of these systems, where two or more adjacent substituents R may optionally form a monocyclic or polycyclic, aliphatic, aromatic or heteroaromatic ring system, which is optionally substituted by one or more radicals R2;
• R2 is selected from the group consisting of H, D, F, CN, an aliphatic hydrocarbon radical having 1 to 20 C atoms, an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, in which one or more H atoms is optionally replaced by D, F, Cl, Br, I or CN, where two or more adjacent substituents R2 may form a mono- or polycyclic, aliphatic, aromatic or heteroaromatic ring system with one another;
• Ar1 is on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5-30 aromatic ring atoms, which is optionally substituted by one or more non-aromatic radicals R2;
• two radicals Ar1 which are bonded to the same N atom or P atom may also be bridged to one another here by a single bond or a bridge selected from N(R2), C(R2)2 or O;
• m and n are, identically or differently on each occurrence, 0 or 1, where, for m=0, a group R instead of the group E is bonded to A, and where, for n=0, a group R instead of the group E is bonded to A;
• p is 0 or 1, where, for p=0, a group R instead of the group Z═Z is bonded to each of the carbon atom and to W, with the proviso that p=1 if m=n=0.