A new 3D transition-metal complex-templated framework based on Wells–Dawson polyoxometalate and copper(I)–pyrazine moieties

A new Wells–Dawson polyoxometalate-based compound, [CuII(2,2′-bipy)2(H2O)]3[CuI6(pz)6(P2W18O62)2] (2,2′-bipy = 2,2′-bipyridine, pz = pyrizine) (1), has been hydrothermally synthesized and characterized by routine physical methods. Compound 1 exhibits a [CuII(2,2′-bipy)2(H2O)]2+ complex-templated 3D (3,4)-connected framework with the topology of (63)(6284), which is built up by the cross-linking of porous P2W18–Cu layers and CuI–pz chains with Cu2 atoms as intersections. The transition-metal complex cation [CuII(2,2′-bipy)2(H2O)]2+ acts not only as a template locating in the voids of inorganic layers, but also as a charge-balance complex to make the 3D structure more steady. The electrochemistry property of compound 1 has also been discussed.