NOVELTY - Complex compound (I) is new.    USE - (I) is useful as emitting compounds in emitting layer, preferably in combination with at least one matrix material, of electronic devices, preferably organic electroluminescent devices (organic light emitting diodes or polymer light-emitting diodes), 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 or organic laser diodes (all claimed).    ADVANTAGE - (I): exhibits high thermal stability, good processability, high solubility in wide range of organic solvents, high efficiency and steep current-voltage curves; and produces very good and pure color coordinates. The organic electroluminescent devices comprising (I) as emitting materials, exhibit long service life.    DETAILED DESCRIPTION - Complex compound of formula (I) is new.    L = (-L1-X-Y1-Z-L2-);    M1, M2 = Pt, Pd, Ni, Ir, Rh, Cu, Ag, Au, Mo, W, Re, Ru or Os;    X, Y1, Z = CR or N;    L1, L2 = -NC, -CN, -NN, -NO, -NS, -CC or -C=CR;    L3 = monodentate ligand or bidentate ligand, which coordinates with metal atoms M1 or M2;    L4 = bidentate ligand that simultaneously coordinates with two metal atoms M1 and M2; either    R = 1-40C alkyl, 1-40C (thio)alkoxy, 2-40C alkenyl, 2-40C alkynyl (all linear), 3-40C alkyl, 3-40C alkenyl, 3-40C alkynyl, 3-40C (thio)alkoxy (all branched or cyclic) (in all groups at least one non-adjacent CH2 group may be replaced by R1C=CR1, CC, Si(R1)2, Ge(R1)2, Sn(R1)2, C=O, C=S, C=Se, CONR1, P(=O)(R1), SO, SO2, NR1, O, S or CONR1, and at least one H may be replaced by D, F, Cl, Br, I, CN or NO2), (hetero)aromatic ring with 5-60 aromatic ring atoms, (hetero)aralkyl with 5-40 aromatic ring atoms, (hetero)aryloxy with 5-40 aromatic ring atoms, diarylamino with 10-40 aromatic ring atoms, diheteroarylamino with 10-40 aromatic ring atoms, arylheteroarylamino with 10-40 aromatic ring atoms (all optionally substituted by at least one group R1), H, D, F, Cl, Br, I, N(R1)2, CN, NO2, Si(R1)3, B(OR1)2, C(=O)R1, P(=O)(R1)2, S(=O)R1, S(=O)2R1 or OSO2R1; or    2R, R+R1 = mono- or polycyclic, aliphatic, aromatic and/or benzo-fused ring; either    R1 = 1-20C alkyl, 1-20C (thio)alkoxy, 2-20C alkenyl, 2-20C alkynyl (all linear), 3-20C alkyl, 3-20C alkenyl, 3-20C alkynyl, 3-20C (thio)alkoxy (all branched or cyclic) (in all groups at least one non-adjacent CH2 group may replaced by R2C=CR2, C=C, Si(R2)2, Ge(R2)2, Sn(R2)2, C=O, C=S, C=Se, C=NR2, P(=O)(R2), SO, SO2, NR2, O, S or CONR2, and at least one H may be replaced by D, F, Cl, Br, I, CN or NO2), (hetero)aromatic ring with 5-60 aromatic ring atoms (hetero)aryloxy with 5-40 aromatic ring atoms, diarylamino with 10-40 aromatic ring atoms, diheteroarylamino with 10-40 aromatic ring atoms, arylheteroarylamino with 10-40 aromatic ring atoms (all optionally substituted by at least one group R2), H, D, F, Cl, Br, I, N(R2)2, CN, NO2, Si(R2)3, B(OR2)2, C(=O)R2, P(=O)(R2)2, S(=O)R2, S(=O)2R2 or OSO2R2; or    at least 2R1, R1+R = monocyclic or polycyclic, aliphatic or aromatic ring; either    R2 = 1-20C aliphatic, 1-20C (hetero)aromatic hydrocarbon (in both groups at least one H may be replaced by F), H, D, F or CN; or    at least 2R2 = mono- or polycyclic, aliphatic or aromatic ring;    m, n = 0-3; and    p = 1-4, where m, n and p are selected such that the coordination number of metals M1 and M2 are 2, 4 or 5.