Iron-platinum cluster preparation

Iron-only hydrogenase, dithiolate-bridged compounds as biomimetic models, 6, 239 Iron oxide films, synthesis, 12, 51 Iron-palladium nanoparticles, preparation, 12, 74 Iron-platinum bimetallic clusters, with isocyanide clustes,... 

Radiolysis has been used successfully in order to synthesize various noble (such as silver, gold and platinum) and non-noble (such as nickel and iron) metal nanoparticles in aqueous solution and also in other solvents such as alcohols. Due to their relatively low redox potential compared to that of the bulk, metal clusters can be oxygen-sensitive. However, the deoxygenation (by bubbling with an inert gas such as argon or nitrogen) of the solutions prior to irradiation and their study under inert atmosphere prevent their oxidation. Moreover, since water radiolysis leads to the formation of protons in addition to that of hydrated electrons, radio-induced acidification of the medium may lead to non-noble metal clusters corrosion. Therefore, to avoid the oxidation by protons, the solutions can be prepared in slightly basic medium. 

The nanoporous hypercrosslinked polystyrene proves to be the material of choice for the preparation of nanocomposites (Chapter 17) by formation of nano-sized clusters of catalyticaUy active metals, for example, platinum or palladium, or of magnetic nano-crystals of iron oxides. Being confined in the nano-cage, the clusters do not agglomerate so that the catalysts remain stable and highly active in any liquid media. 

Nickd, Palladium and Platinum A series of [Cp Ni(alkene)L], L = alkyl, compounds has been prepared, Cp = Cp, Cp, CsPhs. The reaction of substituted cyclo-pentadienes and nickelocene with nickel and iron vapour, to give new cluster conqwunds, have... 

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