NOVELTY - Metal complex compounds (I) are new.    USE - (I) are useful as an emitting compound in at least one emitting layer of electronic devices comprising organic electroluminescent devices (preferred), organic integrated circuits, organic field-effect transistors, organic thin film transistors, organic light-emitting transistors, organic solar cells, organic optical detectors, organic photoreceptors, organic field-quench devices, light-emitting electrochemical cells and organic laser diodes (all claimed).    ADVANTAGE - The electronic device comprising (I) exhibits very good service life and very good efficiency.    DETAILED DESCRIPTION - Metal complex compounds of formula (I) are new.    M = Pt, Pd, Ni, Rh, Ir or Au;    Y1 = CR2, C=O, BR, Si(R)2, NR, PR, P(=O)R, O, S, CR=CR, C(R)2-C(R)2, CR=N or metal complex moieties of formula (II);    D1 = C or N;    E = C (when the ring, in which E is bonded, is 6-membered (hetero)aromatic ring) or C or N (when the ring, in which E is bonded, is 5-membered heteroaromatic ring);    Ar1 = (hetero)aryl with 5-18 aromatic ring atoms (optionally substituted by at least one group R1 and contains D1 and E), where adjacent groups Ar1 and Ar2 are optionally linked with each other by 2 R1, which are linked with each other, or by CR2=N;    Ar2 = (hetero)aryl with 5-18 aromatic ring atoms (optionally substituted by at least one group R1 and contains D1 and E), where adjacent groups Ar2 and Ar1 are optionally linked with each other by 2 R1, which are linked with each other, or by CR2=N, and 2 Ar2 are optionally bridged with each other by a group Y1; either    R = 1-20C alkyl or 1-20C (thio)alkoxy (all linear) or 3-20C alkyl or 3-20C (thio)alkoxy (all branched or cyclic), 2-20C alkenyl or 2-20C alkynyl (in all groups at least one non-adjacent CH2 group is optionally replaced by R2C=CR2, CC, Si(R2)2, C=O, NR2, O, S or CONR2, and at least one H is optionally replaced by D, F, Cl, Br, I or CN), (hetero)aromatic ring with 5-60 aromatic ring atoms, (hetero)aryloxy with 5-40 aromatic ring atoms, (hetero)aralkyl with 5-40 aromatic ring atoms (all optionally substituted by at least one group R2), H, D, F, N(R2)2, CN, C(=O)N(R2)2, Si(R2)3, B(OR2)2, C(=O)R2, P(=O)(R2)2, S(=O)R2 or S(=O)2R2; or    2R that bind to same C or Si = mono- or polycyclic and aliphatic or aromatic ring; either    R1 = 1-20C alkyl or 1-20C (thio)alkoxy (all linear) or 3-20C alkyl or 3-20C (thio)alkoxy (all branched or cyclic), 2-20C alkenyl or 2-20C alkynyl (in all groups at least one non-adjacent CH2 group is optionally replaced by R2C=CR2, CC, Si(R2)2, C=O, NR2, O, S or CONR2, and at least one H is optionally replaced by D, F, Cl, Br, I or CN), (hetero)aromatic ring with 5-60 aromatic ring atoms, (hetero)aryloxy with 5-40 aromatic ring atoms, (hetero)aralkyl with 5-40 aromatic ring atoms (all optionally substituted by at least one group R2), H, D, F, Cl, Br, I, N(R2)2, CN, NO2, OH, COOH, C(=O)N(R2)2, Si(R2)3, B(OR2)2, C(=O)R2, P(=O)(R2)2, S(=O)R2, S(=O)2R2 or OSO2R2;    2 adjacent R1, R1+adjacent Ar1+adjacent Ar2 = mono- or polycyclic and aliphatic or aromatic ring; or    2R1+2Ar2 = ring; either    R2 = 1-20C alkyl or 1-20C (thio)alkoxy (all linear) or 3-20C alkyl or 3-20C (thio)alkoxy (all branched or cyclic), 2-20C alkenyl or 2-20C alkynyl (in all groups at least one non-adjacent CH2 group is optionally replaced by R3C=CR3, CC, Si(R3)2, C=O, NR3, O, S or CONR3, and at least one H is optionally replaced by D, F, Cl, Br, I or CN), (hetero)aromatic ring with 5-60 aromatic ring atoms, (hetero)aryloxy with 5-40 aromatic ring atoms, (hetero)aralkyl with 5-40 aromatic ring atoms (all optionally substituted by at least one group R3), H, D, F, Cl, Br, I, N(R3)2, CN, NO2, Si(R3)3, B(OR3)2, C(=O)R3, P(=O)(R3)2, S(=O)R3, S(=O)2R3 or OSO2R3; or    at least 2 R3 = mono- or polycyclic and aliphatic ring; either    R3 = 1-20C aliphatic and/or 1-20C (hetero)aromatic hydrocarbyl (in both groups at least one H is optionally replaced by F), H, D or F; or    at least 2 R3 = mono- or polycyclic and aliphatic ring; and    X = CR1 or N.    INDEPENDENT CLAIMS are also included for:    (1) preparing (I); and    (2) a formulation, preferably a solution, suspension or a miniemulsion comprising (I) and at least one solvent.