TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (I), comprises reacting a ligand with metal alkoxide compounds of formula (M(OR)n) (X), metal ketoketonate compounds of formula (XI), metal halide compounds of formula (M(X1)n) (XII) or dimeric metal complexes of formula (XIII).X1 = F, Cl, Br or I.Preferred Components: (I) comprises heterocyclic complexes of formula (III)-(VIII).V2 = bridging unit containing 1-80 atoms of third, fourth, fifth and/or sixth main group, or homo- or heterocyclyl with 3-6 atoms, which covalently links 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 Ir or Pt;    X = CH; and    L1 = CO, NO, alkyl cyanides, aryl cyanides, alkyl isocyanides, aryl isocyanides, amines, phosphines, phosphites, arsines, stibines, nitrogen containing heterocycles, carbenes, hydrides, deuteride, F-, Cl-, Br-, I-, alkyl acetylidene, aryl acetylidene, CN, cyanate, isocyanate, thiocyanate, isothiocyanate, aliphatic or aromatic alkoxides, aliphatic or aromatic thioalkoxides, amides, carboxylates, aryl groups, O2-, S2-, carbides, nitrenes, N3-, diamines, imines, diimines, diphosphine, 1,3-diketonate, 3-ketonate, salicyliminate dialkoxide, dithiolate, borates, nitrogen containing heterocycles, eta 5-cyclopentadienyl, eta 5-pentamethylcyclopentadienyl, eta 6-benzene, eta 7-cycloheptatrienyl (all optionally substituted by at least one group R) or ligands, which with the metal form cyclometalated five- or six-membered ring having at least one metal-carbon bond.    SPECIFIC COMPOUNDS - 13 Compounds (I) are disclosed e.g. compounds (Ia)-(Ie).    EXAMPLE - Dimeric p-chloro-precursor complex of formula (XIV) (0.64 mmol) and silver triflate (329 mg) were suspended in degassed ethoxyethanol (2.7 ml). Then (1,7)phenanthroline (3.84 mmol) was added to the obtained suspension. Then the mixture was heated at 120 degrees C for overnight under stirring. After cooling the mixture to room temperature, the resulting solid was worked up to obtain (Ia).