TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): The preparation of (I), comprises reacting a corresponding ligand or a ligand precursor of (I) with a suitable metal precursor. Preferred Components: The compound (I) is uncharged. Preferred Definitions:    M1, M2 = Pt(II), Pd(II) or Au(I) (where M1 and M2 are same);    Y1 = CH;    L1, L2 = -NC, -NN or -CC, preferably -NC or -CC;    L = ((=N-C(R)=C(R)-C(R)=N=O)1+), ((=N-C(R)=C(R)-C(R)=N=S)1+)), (=N-C(R)=C(R)-C(R)=N=N), (=N-C(R)=C(R)-N=N=N), ((=N-C(R)=C(R)-C(R)=N=)1-), ((=N-C(R)=N-C(R)=N=)1-), ((=N-C(R)=C(R)-N=N=)1-), ((=N-C(R)=C(R)-C(R)=C=N)1-), ((=N-C(R)=C(R)-N=C=N)1-), ((=N-C(R)=C(R)-C(R)=C=CH2)2-) or ((CH2=CH-C(R)=C(R)-C(R)=C=CH2)3-);    p = 2-4;    L3 = CO, NO, isonitrile, amine, phosphine, phosphite, arsine, stibine, ether, aliphatic or aromatic sulfide, aliphatic or aromatic selenide, hydride, deuteride, F, Cl, Br, I, azide, alkyl acetylide, (hetero)aryl acetylide, alkyl, aryl, hydroxide, cyanide, cyanate, isocyanate, thiocyanate, isothiocyanate, aliphatic or aromatic alkoxide, aliphatic or aromatic thioalkoxide, amide, carboxylate, nitrogen containing heterocycles, aliphatic or aromatic phosphide of formula (P(R)2-), or aliphatic or aromatic selenide of formula (SeR-), O2-, S2-, nitrene that form coordination of formula (R-N=M), N3-, diamine, imine, diimine, diphosphine, 1,3-diketonate derived from 1,3-diketones, 3-ketonate derived from 3-keto esters, carboxylate derived from aminocarboxylic acids, salicyliminate derived from salicylimine, dialkoxide derived from dialcohols, dithiolate derived from dithiol or bidentate monoanionic ligand, which forms cyclometalated five- or six-membered ring with the metal, exhibiting at least one metal-carbon bond, preferably cyclometalated five-membered ring; and    L4 = H, O, S, Se, CO, CN, NO, alkyl, C(=C(R)2), -CR=CR-, o-phenylene, bis(phosphide), bis-sulfide, bisphosphine, bisamine, bis-amide, carbonate, thiocarbonate, isonitrile, acetylide, thiocarbonyl, cyclic bis(thiolate) moiety of formula (IIa), (R-C(S-)=C(S-)-R), (R-C(R)(S-)-C(R)(S-)-R), octahydro-pyrimido(1,2-a)pyrimidin-1-ium, and heterocyclic moiety of formula (IIb).    Provided that: if the coordination number of metals M1 and M2 are 2, then p = 1, n = 0 and m = 1, or p = 1, n = 1, L3 = monodentate ligand and m = 0, or p = 2, n = 0 and m = 0; if the coordination number of metals M1 and M2 are 4, then p = 1, n = 0 and m = 3, or p = 1, n = 1, L3 = monodentate ligand and m = 2, or p = 1, n = 2, L3 = monodentate ligand and m = 1, or p = 1, n = 1, L3 = bidentate ligand and m = 1, or p = 1, n = 3, L3 = monodentate ligand and m = 0, or p = 1, n = 2, L3 = monodentate and bidentate ligand and m = 0, or p = 2, n = 0 and m = 2, or p = 2, n = 1, L3 = monodentate ligand and m = 1, or p = 2, n = 2, L3 = monodentate ligand and m = 0, or p = 2, n = 1, L3 = bidentate ligand and m = 0, or p = 3, n = 1, L3 = monodentate ligand and m = 0, or p = 3, n = 0 and m = 1, or p = 4, n = 0 and m = 0; if the coordination number of metals M1 and M2 are 5, then p = 1, n = 1, L3 = monodentate ligand and m = 3, or p = 1, n = 2, L3 = monodentate ligand and m = 2, or p = 1, n = 1, L3 = bidentate ligand and m = 3, or p = 1, n = 3, L3 = monodentate ligand and m = 3, or p = 1, n = 2, L3 = monodentate and bidentate ligand and m = 2, or p = 1, n = 4, L3 = monodentate ligand and m = 0, or p = 1, n = 2, L3 = bidentate ligand and m = 0, or p = 2, n = 1, L3 = monodentate ligand and m = 2, or p = 2, n = 2, L3 = monodentate ligand and m = 1, or p = 2, n = 1, L3 = bidentate ligand and m = 1, or p = 2, n = 3, L3 = monodentate ligand and m = 0, or p = 2, n = 2, L3 = monodentate and bidentate ligand and m = 0, or p = 3, n = 1, L3 = monodentate ligand and m = 1, or p = 3, n = 2, L3 = monodentate ligand and m = 0, or p = 3, n = 0 and m = 2, or p = 4, n = 1, L3 = monodentate ligand and m = 0, or p = 4, n = 0 and m = 1.    SPECIFIC COMPOUNDS - 38 compounds (I) are disclosed e.g. platinum complex of formula (Ia), (Ib), (Ic), (Id) and (Ie).    EXAMPLE - Solution of 2-(aminomethyl)aniline (12.2 g) in dichloromethane (100 ml) was mixed with chloroform (17.6 ml), benzyltriethylammonium chloride (500 mg) and 50 wt.% sodium hydroxide (60 ml) and stirred vigorously. Then the mixture was stirred for further 2 hours and worked up to obtain 1-isocyano-2(isocyanomethyl)benzene. Then a solution of tetrakis(isocyanomethane)platinum(II)-bis-tetrafluoroborate (5.32 g) in acetonitrile (100 ml) was mixed with 1-isocyano-2(isocyanomethyl)benzene (2.92 g) and stirred for 20 hours at 50 degrees C. After cooling the reaction mixture to room temperature, a solution of sodium methoxide (641 mg) in methanol (50 ml) was added and stirred for 2 hours at room temperature. Then the reaction mixture was worked up to obtain (Ie).