TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (Claimed): Preparation of (II) comprises: either reaction of a ligand of formula (I) with potassium tetrachloroplatinate (II) in the presence of a halide salt (AX) in a protic medium to give a platinum complex of formula (III) and reacting (III) with organometallic compounds of formula (R 2M) (aa) and/or (R 3M1a) (bb) to give (IIh) (representative of (II)); or reacting (I) with potassium tetrachloroplatinate (II) and organometallic compounds (aa) or (bb) at room temperature in the presence of polar aprotic solvent to give (IIh). Preferred Components: The angle is 64-66 degrees C, preferably 65 degrees C. The support is a high superconducting material (Tc), a ceramic, a heat-resistant polymer, glass, magnesium oxide, perovskite such as lanthanum aluminate (LaAlO 3), nickel, silicon, arsenic gallium, indium phosphide silicon carbide, silicon germanium, and a textile comprising microporous carbon superficial layer. The support comprises one or more intermediate layers comprising metal films, an organic layer, diffusion layers constituted by at least one material comprising titanium nitride, titanium silicon nitride, tantalum, tantalum silicon nitride, tungsten nitride, tungsten silicon nitride, carbon, graphite or nanotubes. Preferred Process: The support is placed in an enclosure: under neutral atmosphere; in the atmosphere of oxygen optionally in mixture with an inert gas; under hydrogen atmosphere; or in the ozone atmosphere. The support is subjected to at least one activation comprising: a thermal activation, activation by laser, activation by UV, plasma activation, activation by ion beams, or electron beam activation. Preferred Definitions:    n=1;    R1b, R1c, R1d, R1j=H;    R1a=H, Cl, methyl, ethyl, n-propyl, isopropyl, tert-butyl, trimethylsilane, propen-3-yl or ethanol;    R 2, R 3=methyl or ethyl; and    R1i=H, methyl or ethyl.    SPECIFIC COMPOUNDS - The use of 6 compounds (II) is specifically claimed e.g. platinum organometallic compounds of formula (IIa)-(IIe).    EXAMPLE - In a dry Schlenk tube, potassium tetrachloroplatinate (II) (830 mg), tetrahydrofuran (20 ml) and ethylnorbornandiene (510 mg) were distilled over sodium and benzophenone, under argon atmosphere. At room temperature, methyl lithium (7 ml) was added and stirred for 24 hours at room temperature. At 0 degrees C diethyl ether (30 ml) was added and then a solution of ammonium chloride (500 mg) in distilled water (20 ml) was added. The organic phase was removed and worked up to give platinum organometallic compound (IIa).