TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (I), comprises reacting free ligands (L and optionally L1) with metal alkoxide compounds of formula (M(OR)n) (XI), metal ketoketonate compounds of formula (XII), metal halide compounds of formula (M(Hal)n) (XIII), dimeric metal complexes of formula (XIV) or metal complexes of formula ((((L1)m-M(L2)2)+)(Z)) (XV).Hal = F, Cl, Br or I;L2 = alcohol or nitrile; andZ1 = non-coordinating anion.Preferred Components: (I) comprise heterocyclic complex compounds of formula (III)-(X).V1 = single bond, bridging unit comprising 1-80 atoms of third-, fourth-, fifth- and/or sixth main group, or 3-6-membered homo- or heterocyclyl, which covalently bonds partial ligand L with each other or L with L1. Preferred Definitions:    M = Cr, Mo, W, Re, Ru, Os, Rh, Ir, Ni, Pd, Pt, Cu, Ag or Au, preferably Mo, W, Re, Ru, Os, Ir, Cu, Pt or Au;    R = 1-10C, preferably 3-10C alkyl or 1-10C, preferably 3-10C alkoxy (both branched or cyclic), CF3, OCF3, (hetero)aromatic ring or (hetero)aralkyl (all optionally substituted by at least one group R2) (when at least one X = N and R is bonded adjacent to N); and    L1 = CO, NO, alkyl cyanide, aryl cyanide, alkyl isocyanide, aryl isocyanide, NH2, phosphine, phosphite, arsine, stibine, nitrogen-containing heterocyclyl, carbene, hydride, deuteride, F-, Cl-, Br-, I-, alkyl acetylidene, aryl acetylidene, CN, cyanate, isocyanate, thiocyanate, isothiocyanate, aliphatic or aromatic alkoxide, aliphatic or aromatic thioalkoxide, amide, carboxylate, aryl, O2-, S2-, carbide, nitrene, N3-, diamine, imine, diimine, heterocyclyl comprising 2 N, diphosphine, 1,3-diketonate derived from 1,3-diketone, 3-ketonate derived from 3-ketoester, carboxylate derived from amino-carboxylic acid, salicyliminate derived from salicylimine, dialkoxide derived from diols, dithiolate derived from dithiol, bis(pyrazolyl-borate), bis(imidazolyl)borate, 3-(2-pyridyl)-diazole, 3-(2-pyridyl)-triazole or bidentate monoanionic and neutral or dianionic ligand which with the metal form cyclometalated five- or six-membered ring having at least one metal-carbon bond.    SPECIFIC COMPOUNDS - Approximately 70 Compounds (I) are disclosed e.g. iridium complexes of formula (Ia)-(Ie).    EXAMPLE - Mixture of 10 mmol tris-acetylacetonato-iridium(III) and 60 mmol 5,5,6,6-tetramethyl-5,6-dihydro-benzo(4,5)imidazo(2,1-a)isoquinoline were melted. Then the melted mixture was heated at 255 degrees C for 60 hours under stirring. Then the mixture was worked up to obtain (Ia).