The first 3D POMOF based on α-metatungstate and mixed-ligand

A new three-dimensional (3D) POMOF based on α-metatungstate and mixed-ligand, [Cu4(pzta)2(bipy)4(H2O)6][H2W12O40]·2H2O (1) (pzta = 5-(2-pyrazinyl) tetrazole, bipy = 4,4′-bipyridine), has been synthesized and characterized by routine methods. In 1, there is a 2D inorganic layer constructed by W12 clusters and copper cations, which is reinforced by the incorporation of the dinuclear copper complexes to form a poly-pendant layer. Furthermore, the dicoordinated bipy ligands as pillars link parallel neighboring poly-pendant layers to generate a novel 3D framework with a (65 · 81)2(67 · 87 · 121) topology. To the best of our knowledge, it represents the first 3D POMOF constructed by α-metatungstate and mixed-ligand. In addition, the electrochemical studies show that 1 has a good electrocatalytic activity toward reduction of nitrite.