Organic electroluminescence device

Organic electroluminescent device comprising at least one compound of the formula (1):

• where the following applies to the symbols and indices used:
• M1, M2 are on each occurrence, identically or differently, a metal selected from the group consisting of Pt, Pd, Ni, Ir, Rh, Mo, W, Re, Ru or Os;
• X is on each occurrence, identically or differently, P, As, Sb or Bi;
• Y is on each occurrence, identically or differently, C(R9)2, Si(R9)2, B(R9), N(R9), P(R9), O, S, Se, C(═O), C(═S), C(═NR9) or C(═C(R9)2);
• L1 is on each occurrence, identically or differently, a monodentate ligand or a bidentate ligand which coordinates to one of the metal atoms M1 or M2;
• L1 here may also be linked to one of the groups R1 to R8;
• L2 is on each occurrence, identically or differently, a bidentate ligand which simultaneously coordinates to both metal atoms M1 and M2;
• R1 to R8 are on each occurrence, identically or differently, F, Cl, Br, I, N(R10)2, CN, Si(R10)3, C(═O)R10, P(R10)2, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or a straight-chain alkenyl or alkynyl group having 2 to 40 C atoms or a branched or cyclic alkyl, alkenyl, alkynyl, alkoxy or thioalkoxy group having 3 to 40 C atoms, each of which may be substituted by one or more radicals R10, where one or more non-adjacent CH2 groups which are not bonded directly to X may be replaced by R10C═CR10, C≡C, Si(R10)2, Ge(R10)2, Sn(R10)2, C═O, C═S, C═Se, C═NR10, P(═O)(R10), SO, SO2, NR10, O, S or CONR10 and where one or more H atoms may be replaced by D, F, Cl, Br, I, CN or NO2, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, each of which may be substituted by one or more radicals R10, or an aralkyl or heteroaralkyl group having 5 to 40 aromatic ring atoms, each of which may be substituted by one or more radicals R10, or an aryloxy or heteroaryloxy group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R10, or a diarylamino group, diheteroarylamino group or arylheteroarylamino group having 10 to 40 aromatic ring atoms, which may be substituted by one or more radicals R10;
• R1 and R2, R3 and R4, R5 and R6 and/or R7 and R8 here may also form a mono- or polycyclic, aliphatic, aromatic and/or benzo-fused ring system with one another;
• in addition, one or more radicals R1 to R8 may be linked to one or more ligands L1 or L2 and thus form a polydentate ligand;
• R9 is on each occurrence, identically or differently, H, D, F, Cl, Br, I, N(R10)2, CN, NO2, Si(R10)3, B(OR10)2, C(═O)R10, P(═O)(R10)2, S(═O)R10, S(═O)2R10, OSO2R10, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or a straight-chain alkenyl or alkynyl group having 2 to 40 C atoms or a branched or cyclic alkyl, alkenyl, alkynyl, alkoxy or thioalkoxy group having 3 to 40 C atoms, each of which may be substituted by one or more radicals R10, where one or more non-adjacent CH2 groups may be replaced by R10C═CR10, C≡C, Si(R10)2, Ge(R10)2, Sn(R10)2, C═O, C═S, C═Se, C═NR10, P(═O)(R10), SO, SO2, NR10, O, S or CONR10 and where one or more H atoms may be replaced by D, F, Cl, Br, I, CN or NO2, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, each of which may be substituted by one or more radicals R10, or an aralkyl or heteroaralkyl group having 5 to 40 aromatic ring atoms, each of which may be substituted by one or more radicals R10, or an aryloxy or heteroaryloxy group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R10, or a diarylamino group, diheteroarylamino group or arylheteroarylamino group having 10 to 40 aromatic ring atoms, which may be substituted by one or more radicals R10;
• two radicals R9 here which are bonded to the same C or Si atom may also form a mono- or polycyclic, aliphatic, aromatic and/or benzo-fused ring system with one another;
• R10 is on each occurrence, identically or differently, H, D, F, Cl, Br, I, N(R11)2, CN, NO2, Si(R11)3, B(OR11)2, C(═O)R11, P(═O)(R11)2, S(═O)R11, S(═O)2R11, OSO2R11, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 20 C atoms or a straight-chain alkenyl or alkynyl group having 2 to 20 C atoms or a branched or cyclic alkyl, alkenyl, alkynyl, alkoxy or thioalkoxy group having 3 to 20 C atoms, each of which may be substituted by one or more radicals R11, where one or more non-adjacent CH2 groups may be replaced by R11C═CR11, C≡C, Si(R11)2, Ge(R11)2, Sn(R11)2, C═O, C═S, C═Se, C═NR11, P(═O)(R11), SO, SO2, NR11, O, S or CONR11 and where one or more H atoms may be replaced by D, F, Cl, Br, I, CN or NO2, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, each of which may be substituted by one or more radicals R11, or an aryloxy or heteroaryloxy group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R11, or a diarylamino group, diheteroarylamino group or arylheteroarylamino group having 10 to 40 aromatic ring atoms, which may be substituted by one or more radicals R11;
• two or more adjacent radicals R11 here may form a mono- or polycyclic, aliphatic or aromatic ring system with one another;
• R11 is on each occurrence, identically or differently, H, D, F or an aliphatic, aromatic and/or heteroaromatic hydrocarbon radical having 1 to 20 C atoms, in which, in addition, one or more H atoms may be replaced by F;
• two or more substituents R11 here may also form a mono- or polycyclic, aliphatic or aromatic ring system with one another;
• m, n are on each occurrence, identically or differently, 0, 1, 2 or 3;
• p is 0, 1, 2 or 3;
• with the proviso that the indices m, n and p are selected so that the coordination number on each of the metals M1 and M2 is four or five.