Metal complexes

A compound of the formula (1),

• where L1 stands, identically or differently on each occurrence, for a part-ligand of the following formula (2),
• where the dashed bond indicates the bond to V, * denotes the position of the coordination to M and the following applies to the symbols and indices used:
• M is selected from the group consisting of Pt, Ir and Au;
• V is selected from the group consisting of NR7, N−, BR7, B(R7)2−, O, S and Se;
• X is on each occurrence, identically or differently, C or N, where all X in the part-ligand of the formula (2) together form a 14π electron system, with the proviso that at least two groups X and at most 6 groups X in each part-ligand of the formula (2) stand for N;
• R1 to R6 is on each occurrence, identically or differently, H, D, F, Cl, Br, I, N(R8)2, CN, NO2, Si(R8)3, B(OR8)2, C(═O)R8, P(═O)(R8)2, S(═O)R8, S(═O)2R8, OSO2R8, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or an alkenyl or alkynyl group having 2 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 R8, where one or more non-adjacent CH2 groups is optionally replaced by R8C═CR8, C≡C, Si(R8)2, C═O, C═S, C═NR8, P(═O)(R8), SO, SO2, NR8, O, S or CONR8 and where one or more H atoms is optionally replaced by D, F, Cl, Br, I or CN, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may in each case be substituted by one or more radicals R8, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which is optionally substituted by one or more radicals R8, or an aralkyl or heteroaralkyl group having 5 to 60 aromatic ring atoms, which is optionally substituted by one or more radicals R8, or a diarylamino group, diheteroarylamino group or arylheteroarylamino group having 10 to 40 aromatic ring atoms, which is optionally substituted by one or more radicals R8;
• R4 and R5 and/or R5 and R6 and/or R1 and R7 here may also form a mono- or polycyclic, aliphatic, aromatic and/or benzo-fused ring system with one another;
• furthermore, R2 and R3 may form a mono- or polycyclic, aliphatic ring system with one another;
• with the proviso that R1 to R6 represents a free electron pair if the group X to which this radical R1 to R6 is bonded is a nitrogen atom with a saturated valence;
• R7 is on each occurrence, identically or differently, H, D, Si(R8)3, C(═O)R8, a straight-chain alkyl or alkoxy group having 1 to 40 C atoms or an alkenyl or alkynyl group having 2 to 40 C atoms or a branched or cyclic alkyl or alkoxy group having 3 to 40 C atoms, each of which is optionally substituted by one or more radicals R8, where one or more non-adjacent CH2 groups is optionally replaced by R8C═CR8, C≡C, Si(R8)2, C═O, C═S, C═NR8, P(═O)(R8), SO, SO2, NR8, O, S or CONR8 and where one or more H atoms is optionally replaced by D, F, Cl, Br, I or CN, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may in each case be substituted by one or more radicals R8, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which is optionally substituted by one or more radicals R8, or an aralkyl or heteroaralkyl group having 5 to 60 aromatic ring atoms, which is optionally substituted by one or more radicals R8;
• R1 and R7 here may also form a mono- or polycyclic, aliphatic, aromatic and/or benzo-fused ring system with one another;
• R8 is on each occurrence, identically or differently, H, D, F, Cl, Br, I, N(R9)2, CN, NO2, Si(R9)3, B(OR9)2, C(═O)R9, P(═O)(R9)2, S(═O)R9, S(═O)2R9, OSO2R9, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or an alkenyl or alkynyl group having 2 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 R9, where one or more non-adjacent CH2 groups is optionally replaced by R9C═CR9, C≡C, Si(R9)2, C═O, C═S, C═NR9, P(═O)(R9), SO, SO2, NR9, O, S or CONR9 and where one or more H atoms is optionally replaced by D, F, Cl, Br, I or CN, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may in each case be substituted by one or more radicals R9, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which is optionally substituted by one or more radicals R9, or an aralkyl or heteroaralkyl group having 5 to 60 aromatic ring atoms, which is optionally substituted by one or more radicals R9, or a diarylamino group, diheteroarylamino group or arylheteroarylamino group having 10 to 40 aromatic ring atoms, which is optionally substituted by one or more radicals R9;
• two or more adjacent radicals R8 here may form a mono- or polycyclic, aliphatic or aromatic ring system with one another;
• R9 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 is optionally replaced by F;
• two or more substituents R9 here may also form a mono- or polycyclic, aliphatic or aromatic ring system with one another;
• L2 is a bidentate part-ligand which is bonded to V;
• n is 1 or 2;
• and
• m is (2-n).