Materials for organic electroluminescent devices

A compound of formula (1)

• where the symbols used are as follows:
• A, B are each selected from the group consisting of N Ar1, C═O, C═S, C═NR, BR, PR, P(═O)R, SO and SO2, with the proviso that one of the symbols A and B is NAr1 and the other of the symbols A and B is C═O, C═S, C═NR, BR, PR, P(═O)R, SO or SO2;
• Cy together with the two carbon atoms shown explicitly is a group of the following formula (2):
• where the dotted bonds indicate the linkage of this group in formula (1);
• X is the same or different at each instance and is CR′ or N;
• or the two X groups are a group of the following formula (3):
• Y, Z is the same or different at each instance and is CR or N;
• A1 is the same or different at each instance and is NAr3, O, S or C(R)2;
• Ar1, Ar2, Ar3 is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms and may be substituted by one or more R radicals;
• Ar1 here may form a ring system with an adjacent R′ radical;
• R, R′ is the same or different at each instance and is H, D, F, Cl, Br, I, N(Ar′)2, N(R1)2, OAr′, SAr′, CN, NO2, OR1, SR1, COOR1, C(═O)N(R1)2, Si(R1)3, B(OR1)2, C(═O)R1, P(═O)(R1)2, S(═O)R1, S(═O)2R1, OSO2R1, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or more R1 radicals, where one or more nonadjacent CH2 groups may be replaced by Si(R1)2, C═O, NR1, O, S or CONR1, or an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms, preferably 5 to 40 aromatic ring atoms, and may be substituted in each case by one or more R1 radicals;
• at the same time, two R radicals together may also form an aliphatic, heteroaliphatic, aromatic or heteroaromatic ring system;
• in addition, two R′ radicals together may also form an aliphatic or heteroaliphatic ring system;
• in addition R′ may form a ring system with an adjacent Ar1 radical;
• Ar′ is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms and may be substituted by one or more R radicals;
• R1 is the same or different at each instance and is H, D, F, Cl, Br, I, N(R2)2, CN, NO2, OR2, SR2, Si(R2)3, B(OR2)2, C(═O)R2, P(═O)(R2)2, S(═O)R2, S(═O)2R2, OSO2R2, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or more R2 radicals, where one or more nonadjacent CH2 groups may be replaced by Si(R2)2, C═O, NR2, O, S or CONR2, or an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms and may be substituted in each case by one or more R2 radicals;
• at the same time, two or more R1 radicals together may form an aliphatic ring system;
• R2 is the same or different at each instance and is H, D, F, CN or an aliphatic, aromatic or heteroaromatic organic radical having 1 to 20 carbon atoms, in which one or more hydrogen atoms may also be replaced by F.