Monopotassium monosodium hexahydrogen α-hexamolybdoplatinate(IV) undecahydrate

Abstract

The title compound, KNa[H6PtMo6O24]·11H2O, contains a discrete hexamolybdoplatinate(IV) [H6PtMo6O24]2− polyanion (1 symmetry), which has the highest level of protonation. Five O atoms of the central PtO6 octahedron (μ3-atoms, Oc) and one O atom of an outer edge-sharing MoO6 octahedron (O bridging μ2-atom, Ob) are protonated. The polyanions are connected by almost linear O—H...O hydrogen bonds between protonated and unprotonated Ob atoms. Further consolidation of the crystal structure is accomplished by extensive O—H...O hydrogen bonding involving the uncoordinated water molecules. The two independent K+ cations are equally disordered about a twofold rotation axis.