TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (Claimed): Preparation of (I) comprises reacting corresponding free ligands (optionally present in deprotonated form) and optionally other ligands L1 with a metal salt or metal complex. Preferred Components: The substructure has 1H-indene moieties of formulae (III)-(VI). (I) is of formulae (VII)-(XII).V1 = single bond or bridging unit containing 1-80 atoms of third, fourth, fifth and/or sixth main group (Group 13, 14, 15 or 16 according to IUPAC) or 3- to 6-membered homo- or heterocycle. Preferred Definitions:    M = Cu(I) (preferred), Ag(I), Au(I), Ru(II), Zn(II), Al(III), Ga(III) or In(III);    A = heteroaryl group having 5-14, preferably 5-10 aromatic ring atoms;    R = heteroaryl, aryl-, heteroaryl- or alkyl cyanides, aryl-, heteroaryl- or alkyl isocyanides, amines, amides, alcohols, alkoxides, thioalcohols, thioalcoholates, phosphines, phosphites, carbonyl, carboxylates, carbamides, or aryl-, heteroaryl- or alkyl acetylides; and    L1 = carbon monoxide, nitric oxide, alkyl cyanides, aryl cyanides, alkyl isocyanides, aryl isocyanides, amines, phosphines, phosphites, arsines, stibines, nitrogen containing heterocycles, carbenes, hydride, deuteride, halides (F-, Cl-, Br- or I-), alkyl acetylides, aryl acetylides, cyanide, cyanate, isocyanate, thiocyanate, isothiocyanate, aliphatic or aromatic alcoholates, aliphatic or aromatic thioalcoholates, amides, carboxylates, diamines, imines, diphosphines, 1,3-diketonates derived from 1,3-diketones, 3-ketonates derived from 3-keto esters, carboxylates derived from amino carboxylic acids, salicyliminate derived from salicylimines, dialcoholates derived from diols or dithiolates derived from dithiols.    SPECIFIC COMPOUNDS - 144 Compounds (I) are disclosed e.g. copper complex of formulae (Ia)-(Ie).    EXAMPLE - 4,5-Bis-diphenylphosphanyl-9,9-dimethyl-9H-xanthene (38.2 mg) and 7-thiophen-2-yl-1H-indole (110.9 mg) were introduced in a glove box. 0 mg of Copper-mesityl and 3 ml of toluene were added and reacted at a room temperature for 1 hour. The solid is filtered off, the solution was dried in vacuum, dissolved in dichloromethane and covered with hexane to obtain orange crystals under the UV (356 nm) to obtain copper complex with yield of 92%.