NOVELTY - Metal complex compounds (I) are new.    USE - (I) are useful: in oligomer, dendrimer or polymer and formulation; as emitting compound in at least one emitting layer in an electronic device preferably organic electroluminescent devices (preferred), organic integrated circuits, organic field effect transistor gates, 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; for the generation of singlet oxygen; and in photocatalysis (all claimed).    ADVANTAGE - (I) provide emitter with improved efficiency, operating voltage, life time, color coordinates and color purity and show solubility and/or oxidation stability.    DETAILED DESCRIPTION - Metal complex compounds of formula (M(L)n (L')m) (I) are new.    M (L)n=moiety of formula (II), preferably N-containing heteocyclic moieties;    M=iridium or platinum;    D1=aryl or heteroaryl group having 5-18C, fluorene or azafluorene, which coordinates respectively via a carbon atom on M and which is connected respectively via a covalent bond with D2 (all optionally substituted by R), preferably aryl moiety, N-containing heteroaryl moieties;    X=CR or N;    W1=NR, O, S or CR2;    D2=5-18C heteroaryl, which coordinates via a neutral nitrogen atom or via a carbene carbon atom at M, and which is connected via a covalent bond with D1 (optionally substituted by R), preferably N-containing heteocylic moieties;    R=straight-chain alkyl, alkoxy or thioalkoxy having 1-20C, alkenyl or alkynyl having 2-20C, branched or cyclic alkyl, alkoxy or thioalkoxy having 3-20C (all optionally substituted by R1, at least one non-adjacent CH2 group is optionally replaced by R1C=CR1, C(C), Si(R1)2, C=O, NR1, O, S or CONR1 and at least one H-atom is optionally replaced by D, F, Cl, Br, I or CN), aromatic or heteroaromatic ring having 5-40C, aryloxy or heteroaryloxy having 5-40C, aralkyl or heteroaralkyl having 5-40C, diarylamino group, di-heteroarylamino or arylheteroarylamino having 10-40C (all optionally substituted by R, two adjacent R are fused together to form a mono- or polycyclic, aliphatic, aromatic or heteroaromatic ring, in which out of two R groups, one is bonded to D2 and the other bonded to D1, or D1 and D2 contain two adjacent carbon atoms substituted by R are clamped on fused moiety of formula (III), preferably aromatic hydrocarbon moieties, H, D, F, Cl, Br, I, N(R1)2, CN, NO2, OH, COOR1, C(=O)-N(R1)2, Si(R1)3, B(OR1)2, C(=O)R1, P (= O)(R1)2, S(=O)R1, S (=O)2R1 or OSO2R1;    G1=ethylene group (optionally substituted by R4);    G2=methylene or ethylene (both optionally substituted by R4), single bond or O;    A1, A2=N or CR2;    A3, A4=2 or 3C alkylene in which a carbon atom can be replaced by oxygen and which is optionally substituted by R3;    R1-R3=straight-chain alkyl, alkoxy or thioalkoxy having 1-20C, alkenyl or alkynyl having 2-20C branched or cyclic alkyl, alkoxy or thioalkoxy having 3-20C (all optionally substituted by R4, at least one non-adjacent CH2 group is optionally replaced by R4C=CR4, C(C), Si(R4)2, C=O, NR4, O, S or CONR4 and where at least one H atom is optionally replaced by D, F, Cl, Br, I, CN or NO2), aromatic or heteroaromatic ring having 5-40C, aryloxy or heteroaryloxy having 5-40C, aralkyl or heteroaralkyl having 5-40C, diarylamino, diheteroarylamino or arylheteroarylamino having 10-40C (all optionally substituted by R4, and at least two adjacent R1 groups are fused together to form mono- or polycyclic, aliphatic, aromatic or heteroaromatic ring and/or two adjacent R3 groups are fused to form mono- or polycyclic, aliphatic ring, where the ring formation is possible between two R3 groups, which are bonded to A3 and A4), H, D, F, Cl, Br, I, N(R4)2, CN, NO2, Si(R4)3, B(OR4)2, C(=O)R4, P(=O)-(R4)2, S(=O)-R4, S(=O)2-R4 or OSO2R4;    R4=aliphatic,aromatic and/or heteroaromatic hydrocarbyl having 1-20C (at least one H is optionally replaced by F), H, D or F, where at least two R4 groups are fused to form mono- or polycyclic ring;    L'=carbon monoxide, nitric oxide, alkyl cyanides, aryl cyanides, alkylisocyanides, aryl isocyanides, amines, phosphines, phosphites, arsines, stibines, nitrogen-containing heterocycles, carbenes, hydride, deuteride, F-, Cl-, B- and I-, alkylacetylidene, arylacetylidene, cyanide, cyanate, isocyanate, thiocyanate, isothiocyanate, aliphatic or aromatic alcoholates, aliphatic or aromatic thioalcoholates, amides, carboxylates, aryl groups, O2-, S2- carbides, nitrenes, imines, 1, 3-diketonates derived from 1, 3-diketones, 3-ketonates derived from 3-ketoesters, salicyliminates, borates of nitrogen-containing heterocycle or monoanionic ligands having at least one metal-carbon bond M cyclometalated five or six-membered rings;    n=1-3; and    m=0-4.    Provided that in A1-A3-A2 or A1-A4-A2, two heteroatoms are not directly linked to each other; and L and L' are linked via a single bond, bivalent or trivalent bridge. INDEPENDENT CLAIMS are also included for:    (1) preparation of (I);    (2) oligomer, dendrimer or polymer comprising (I), where at least one position of (I) is bonded to the polymer, oligomer or dendrimer; and    (3) formulation comprising (I) or the oligomer, polymer or dendrimer, and at least one further compound and/or a solvent.