A 3D architecture constructed by saturated Dawson polyoxoanions and transition-metal coordination complexes [CuI7(Bpy)6(BpyEt)2]

A novel organic–inorganic hybrid compound: K2(H3O)[CuI7(Bpy)6(BpyEt)2][P2W18O62]2·6H2O 1 (bpy = 4,4′-bipyridine; BpyEt+ = N-ethylbipyridine cation) was hydrothermally synthesized and structurally characterized by routine techniques and single-crystal X-ray diffraction analysis. The compound is a 3D architecture constructed by saturated Dawson polyoxoanions and transition-metal coordination complexes (containing N-ethylated bpy) [CuI7(Bpy)6(BpyEt)2], in which the [P2W18O62]6− (P2W18) clusters are modified by five CuIN coordination polymeric chains. The striking feature of the structures is that there are three kinds of coordination geometries for copperI ions, which are responsible for the formation of polymeric structures. It is also interesting that N-ethylated bpy was firstly in the high dimensional POM framework.