| Summary: | Nonavanadoplatinate [PtIVV9O28]7−, which is the first heteropolyoxovanadate in the decavanadate framework, [V10O28]6−, has been investigated crystallographically. The title compound, Na9[H2PtIVV9O28][H3PtIVV9O28]·40H2O, was obtained by a hydrothermal reaction at pH = 2. This compound contains two different protonated heteropolyoxovanadates, [H2PtIVV9O28]5− [polyanion (A)] and [H3PtIVV9O28]7− [polyanion (B)]. The locations of the H atoms on the protonated O atoms were observed in difference Fourier maps and confirmed by the interpolyanion hydrogen bonds, bond-length elongation and bond-valence-sum (VBS) analysis. The two (Pt and V)-bound μ2-O atoms are protonated in both polyanions. The position of the third protonated O atom in polyanion (B) is an interesting feature of the structure, being located on one (V2)-bound μ2-O atom. The discrete heteropolyanions form a dimer, {H5[PtV9O28]2}9−, through five interpolyanion hydrogen bonds. Additional O—H...O hydrogen bonds and interactions between Na+ cations and water molecules as well as terminal O atoms of one of the polyanions consolidate the crystal packing.
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