Keggin-Type Polyoxometalate Cluster Functionalized with Dinuclear M-H2biim (M = Cu, Ag) Metal–Organic Segments

Abstract

Three inorganic-organic hybrid complexes, [Cu 2 (H 2 biim) 2 (OH) 2 ] 2 (SiW 12 O 40 )Á2H 2 O (1), [Cu 2 (H 2 biim) 2 ] 2 (SiW 12 O 40 )Á2H 2 O (2) and [Ag 2 (H 2 biim) 2 ] 2 (SiW 12 O 40 )Á2H 2 O (3) (H 2 biim = 2, 2 0 -biimidazole), have been synthesized under hydrothermal conditions, and characterized by elemental analysis, IR, PXRD, TG and single-crystal X-ray diffraction. The crystallographic analysis reveals that in compounds 1-3, the Keggin polyanions [a-SiW 12 O 40 ] 4-act as inorganic building blocks, which are linked with the dinuclear metal-organic units via Cu-O bonds in compound 1, or through supramolecular interactions in compounds 2 and 3. Compound 1 shows a 3D supramolecular structure constructed by net-like layers. Compounds 2 and 3 display 2D layer structures which were composed of wave-like chains. In addition, these compounds show electrochemical activities, and photoluminescence properties are measured in the solid state.