NOVELTY - Metal complex compounds (I) comprising aryl or heteroaryl units (II) are new.    USE - (I) are useful: in an electronic device; for generating singlet oxygen or photocatalysis; and as emitting compound in one or more emitting layer, preferably in combination with a matrix material, where the electronic device includes organic electroluminescent devices, organic integrated circuits, organic FETs, 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). (I) are useful as co-matrix for longer wavelength emitting triplet emitter such as green or red-emitting triplet emitters.    ADVANTAGE - (I) increase the efficiency, thermal stability and service life of the electric device.    DETAILED DESCRIPTION - Metal complex compounds of formula (M(L) n(L1a) m) (I) comprising aryl or heteroaryl units of formula (II) are new.    M=Ir or Pt;    CyC=aryl or heteroaryl group having 5-18 aryl ring, or F, which is optionally coordinated via a carbon atom to M, is optionally substituted by one or more radicals R and is optionally connected via a covalent bond with CyD;    CyD=heteroaryl having 5-18 aryl ring, which is optionally coordinated via a neutral nitrogen atom or via a carbene carbon atom at M, is optionally substituted with one or more radicals R and is connected via a covalent bond with CyC;    R=H, D, F, Cl, Br, I, N(R1) 2, CN, NO 2, OH, COOH, C(=O)N(R1) 2 , Si(R1) 3 , B1(OR1) 2 , C(=O)R1 , P(=O)(R1) 2, S(=O)R1, S(=O) 2R1, OSO 2R1, linear 1-20C-alkyl, -alkoxy or -thioalkoxy, 2-20C-alkenyl, or -alkynyl, branched or cyclic 3-20C-alkyl, -alkoxy or -thioalkoxy, which is optionally substituted each with one or more radicals R1, where one or more non-adjacent CH 2 groups are replaced by R1C=CR1,-CC-, Si(R1) 2, C=O, NR1, O, S or CONR1, and one or more H atoms are replaced by D, F, Cl, Br, I or CN, aryl or heteroaryl ring system having 5-60 aryl ring atoms, which are optionally substituted by one or more radicals R1, aryloxy or heteroaryloxy having 5-40 aryl ring atoms, which are optionally substituted by one or more radicals R1, aralkyl or heteroaralkyl having 5-40 aryl ring atoms, which are optionally substituted by one or more radicals R1, or diarylamino, diheteroarylamino or arylheteroarylamino having 10-40 aryl ring atoms, which are optionally substituted by one or more radicals R1, where two adjacent radicals R also form mono-or polycyclic, aliphatic, aryl or heteroaryl ring system;    R1=H, D, F, Cl, Br, I, N(R2) 2, CN, NO 2, C(=O)R2 , P(=O)(R2) 2, S(=O)R2, S(=O) 2R2, OSO 2R2, linear 1-20C-alkyl, -alkoxy or -thioalkoxy, 2-20C-alkenyl, or -alkynyl, branched or cyclic 3-20C-alkyl, -alkoxy or -thioalkoxy, which is optionally substituted by one or more radicals R1, where one or more non-adjacent CH 2 groups are replaced by R2C=CR2,-CC-, Si(R2) 2, C=O, NR2, O, S or CONR2, and one or more H atoms are replaced by D, F, Cl, Br, I or CN, aryl or heteroaryl ring system having 5-60 aryl ring atoms, which are optionally substituted by one or more radicals R2, aryloxy or heteroaryloxy having 5-40 aryl ring atoms, which are optionally substituted by one or more radicals R2, aralkyl or heteroaralkyl having 5-40 aryl ring atoms, which are optionally substituted by one or more radicals R2, or diarylamino, diheteroarylamino or arylheteroarylamino having 10-40 aryl ring atoms, which are optionally substituted by one or more radicals R2, where two adjacent radicals R1 also form mono-or polycyclic, aliphatic, aryl or heteroaryl ring system;    R2=H, D, F or aliphatic, aryl or heteroaryl hydrocarbyl having 1-20C in which one or more H atoms are replaced by F, where two or more radicals R2 also form mono-or polycyclic, aliphatic ring system;    L1a=co-ligand;    n=1-3;    m=0-4, where CyC and CyD consist of C(R1) 2, C(R1) 2-C(R1) 2-, NR1, O or S and are linked to one another, more ligands L or L together with L1a are linked by a single bond or a bivalent or trivalent bridge and have a tridentate, tetradentate, pentadentate or hexadentate ligand systems, one radical R additionally coordinates to the metal, the CyD and/or the CyC has two adjacent carbon atoms, which are optionally substituted with radicals R, the respective radical R together with the carbon atoms form a ring having a structure of formula (III) or (IV), and the dashed bonds indicate the linking of two carbon atoms in the ligand;    A1, A3=C(R3) 2, O, S, NR3 or C(=O);    A2=C(R1) 2, O, S, or NR3 or C(=O);    G=1-3C alkylene, which is substituted with one or more radicals R2, -CR2=CR2- or ortho-linked arylene- or heteroarylene having 5-14 aryl ring atoms, which are substituted by one or more radicals R2; and    R3=F, linear-chain alkyl or alkoxy having 1-20C, branched or cyclic alkyl or alkoxy having 3-20C, which is optionally substituted with one or more radicals R2, where one or more non-adjacent CH 2 groups are replaced by R2C=CR2, -CC-, Si(R2) 2, C=O, NO 2, O, S or CONR 2 and one or more H atoms are replaced by D or F, aryl or heteroaryl ring system having 5-24 aryl ring atoms, which are optionally substituted by one or more radicals R2, aryloxy or heteroaryloxy having 5-24 aryl ring atoms, which are optionally substituted by one or more radicals R2, aralkyl or heteroaralkyl having 5-24 aryl ring atoms, which are optionally substituted by one or more radicals R2, where two radicals R3, which are bonded to the same carbon atom, together form an aliphatic or aryl ring system, and further R3 with the adjacent radical of R or R1 form an aliphatic ring system, provided that A1-A2-A3 is not two heteroatoms directly bonded to each other.    INDEPENDENT CLAIMS are included for:    (1) the preparation of (I); and    (2) oligomer, dendrimer or polymer comprising (I), where one or more bonds of the compound are present to the polymer, oligomer or dendrimer.