Self-assembly of high-dimensional architecture from Strandberg-type polyoxometalate clusters and silver ions

A new three-dimensional (3D) compound [Ag12(OH)2(H2O)4KNa(P2Mo5O23)2] (1), was synthesized by the liquid diffusion method and characterized by single crystal X-ray diffraction analysis, elemental analysis, IR spectroscopy and thermal gravimetric analysis. In 1, two crystallographically independent P2Mo5 clusters are surrounded by thirty-seven Ag+ ions, three K+ ions and three Na+ ions, representing the highest connected number of the Strandberg-type POMs to date. There are twelve crystallographically unique silver cations, which have different coordination geometries: distorted triangular prism, distorted octahedron, distorted square-pyramid and distorted trigonal bipyramid. All the Strandberg-type units are interlinked by Ag (I) forming a 3D arrangement through O-Ag-O bridging bonds. The luminescent property of the compound 1 is tested in the solid state.