Mixed-metal Clusters Containing Only Group

As is the case for transition metal cluster compounds in general, singlecrystal X-ray diffraction is normally the only technique available for the unambiguous structural characterization of heteronuclear Group IB metal clusters. Tables I, II, and IV-XIV indicate the mixed-metal clusters containing one or more ML (M = Cu, Ag, or Au L = two-electron donor ligand) units which have been studied by X-ray crystallography. Other... 

The same authors also explored complexes in which the ligand 18 was mixed with similar ligands that lacked the urea functionality (Q = wo-quinoline). Although the metal complex /ra i-[Pt(18)2(Q)2] only contains two mea functions, it was rationalized that three of these receptors could provide six urea groups to bind two sulfate ions. This turned out to be the case, and the X-ray structure of the resulting cluster [Pt(18)2(Q)2]3[S04]2 " is shown... 

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