Materials for organic electroluminescence device

A compound of the formula (1)

• wherein
• Y is C(R1)2;
• X is on each occurrence, identically or differently, CR2 or N;
• R is on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which is optionally substituted by one or more radicals R3, or an N(Ar)2, Si(Ar)3, C(═O)Ar, OAr, ArSO, ArSO2, P(Ar)2, P(O)(Ar)2 or B(Ar)2 group;
• Ar is on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, which is optionally substituted by one or more non-aromatic radicals R3;
• two radicals Ar here which are bonded to the same nitrogen, phosphorus or boron atom is optionally linked to one another by a single bond or a bridge selected from B(R4), C(R4)2, Si(R4)2, C═O, C═NR4, C═C(R4)2, O, S, S═O, SO2, N(R4), P(R4) and P(═O)R4;
• R1 is on each occurrence, identically or differently, H, D, F, a linear alkyl group having 1 to 20 C atoms, a branched or cyclic alkyl group having 3 to 20 C atoms, or a plurality of radicals R1 optionally forms a ring system with one another;
• R2 is on each occurrence, identically or differently, H, D, F, CN, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms, or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 40 C atoms, each of which is optionally substituted by one or more radicals R4, where one or more non-adjacent CH2 groups is optionally replaced by R4C═CR4, C≡C, O or S, and where one or more H atoms is optionally replaced by F;
• R3 is on each occurrence, identically or differently, H, D, F, Cl, Br, I, CHO, N(Ar)2, C(═O)Ar, P(═O)(Ar)2, S(═O)Ar, S(═O)2Ar, CR2═CR2Ar, CN, NO2, Si(R4)3, B(OR4)2, B(R4)2, B(N(R4)2)2, OSO2R4, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 40 C atoms, each of which is optionally substituted by one or more radicals R4, where one or more non-adjacent CH2 groups is optionally replaced by R4C═CR4, C≡C, Si(R4)2, Ge(R4)2, Sn(R4)2, C═O, C═S, C═Se, C═NR4, P(═O)(R4), SO, SO2, NR4, O, S or CONR4 and where one or more H atoms is optionally replaced by F, Cl, Br, I, CN or NO2, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which optionally in each case is substituted by one or more radicals R4, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which is optionally substituted by one or more radicals R4, or a combination of these systems;
• two or more adjacent substituents R3 here may also form a mono- or polycyclic, aliphatic or aromatic ring system with one another;
• R4 is on each occurrence, identically or differently, H, D or an aliphatic hydrocarbon radical having 1 to 20 C atoms, or an aromatic or heteroaromatic hydrocarbon radical having 5 to 20 C atoms, in which, in addition, H atoms is optionally replaced by F;
• or two or more adjacent substituents R4 optionally forms a mono- or polycyclic, aliphatic or aromatic ring system with one another;
• the following compounds are excluded from the invention: