Rhodium oxidative aggregation

Oxidative aggregation is not restricted to rhodium HNCC. The dianions [Nil2(00)2iH(4= 2, 3), for example, have been produced from the reaction of [Ni6(CO)ig] with acids (257). In this case it was established by IR and H NMR spectroscopy that the condensation processes occur through the sequence of reactions given by Eqs. (13)-(15). 

Chen et al. [37] studied a series of complexes of styrene-4-vinylpyridine copolymers or poly(4-vinylpyridine) and transition metal chlorides. The transition metal-polymer complexes were used to prepare ultra-fine metallic particles dispersed in a polymer matrix by chemical reduction. Upon reduction, the metal ions were transformed into the corresponding nanometer scale metal particles with the protective polymers preventing the metal particles from oxidation and excessive aggregation. Ohtaki et al. reported the effects of polymer support on the substrate selectivity of covalently immobilized ultra-fine rhodium particles as a catalyst for olefin hydrogenation [38]. 

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