A hybrid compound $(H_{2}bbi)[Cu_{2}(pzta)_{2}(H_{2}O)_{2}][β-$Mo_{8}O_{26}$] (1) (pztaH = 5-(2-pyrazinyl) tetrazolate,bbi = 1,1'-(1,4-butanediyl)bis(imidazole), has been hydrothermally synthesized and characterized byelemental analysis, IR spectroscopy and single-crystal X-ray diffraction. In 1, the β-$Mo_{8}$ clusters link dinuclearcopper (II) complexes as bidentate connectors to form inorganic-organic chains. These chains and the $[H_{2}bbi]^{2+}$ counter-cations are fused together forming layers via hydrogen bonding interactions. The electrochemicalproperties of 1 were studied. The results indicate that 1 has an electrocatalytic activity towards thereduction of iodate ascribed to the Mo-centers.

By introducing mixed-ligands en and ox, Cu²⁺ and different polyoxotungstates as synthons, two new polyoxotungstate-based inorganic-organic hybrid compounds {[Cu₂ (en) &#8322 (ox)][HPW₁₂O₄₀]} · (en) ₂ · 2H₂O (1) and {[Cu₂ (en) ₂ (ox)] [H₃BW₁₂O₄₀]} · (en) ₂ · 2H₂O (2) (en = ethylenediamine and ox = oxalate), were obtained in identical hydrothermal conditions and further characterized by elemental analyses, IR spectroscopy and single-crystal X-ray diffraction. Structural analyses revealed that both compounds are isostructural, and show one-dimensional (1D) chain constructed by [XW₁₂O₄₀]ⁿ− (X = P 1, B 2) Keggin-type polyoxoanions and [Cu₂ (en) ₂ (ox)] ²⁺ dinuclear copper subunits. The electrochemical experiments indicated that 1-based carbon paste electrode possesses high catalytic efficiency and selectivity towards reduction of H₂O₂, and thus 1 has potential to detect H₂O₂.