THE CHEMISTRY OF PALLADIUM-OSMIUM MIXED-METAL CARBONYL CLUSTERS. Wing-Tak Wong Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong.
The heterometallic cluster Os6Pd(CO)18(bipy) has been isolated in moderate yield from the reaction of Os3(CO)10(MeCN)2 and (bipy)Pd(CO2Me)2, and has been shown by a single crystal X-ray structure analysis to contain a monocapped octahedral metal core with the palladium occupying one vertex of the octahedron. Reaction of (bipy)Pd(CO2Me)2 with H2Os3(CO)10 affords Os3(CO)12{Pd(bipy)} 2 which exhibits an A-frame metal core. The unsaturated cluster H2Os3(CO)10 also react with trans-[py2PdCl2] to give a range of mixed-metal clusters of palladium and osmium. All new clusters have been fully characterized by spectroscopic methods and crystallography. Some structural formula of these mixed-metal clusters are showed in the following figure: