Coordination of Palladium(II) and Platinum(II) Complexes to One Vacant Site in an alpha-Keggin-Type Polyoxotungstate

A palladium-platinum bimetal complex containing a mono-lacunary alpha-Keggin-type polyoxotungstate is demonstrated. The bimetallic complex Gs(2.5){Pd-H(bpy)}(0)(.2)(5)[alpha-PW11O39{Pd-II(bpy)}{cis-Pt-II(NH3)(2)}]center dot 12H(2)O center dot 2CH(3)CN (bpy = 2,2'-bipyridine) (PdPt) was synthesized by the reaction of Cs4.9K0.1 [alpha-PW11O39 {cis-P-II(NH3)(2)}]center dot 10H(2)O (PtI) with Pd"(bpy)C1 2 in aqueous solution. The compound PdPt was characterized via elemental analysis, thermogravimetric/differential thermal analysis, and Fourier transform infrared, ultraviolet-visible, cold-spray ionization mass, and solution (H-1, C-13, and P-31) nuclear magnetic resonance spectroscopies. The coordination of {cis-Pt-II(NH3)(2)} and {Pd-II(bpy)} moieties to the mono-vacant site of [PW11O39](7-) resulted in an asymmetric, monomeric compound. A unique exchange reaction between the counter cation [Pd-II(bpy)](2+) and {cis-prII(NH3)(2)} moitry in [alpha-PW11O39{Pd-II(bpy)){cis-Pt-II(NH3)(2)}](3-) in a dimethylsulfoxide solution was also observed.