A new extended structural compound based on saturated Wells–Dawson polyoxoanions

A new 3D extended structural compound, (dpdo)2H2{[Cu(2,2′-bipy)2]2(P2W18O62)}·5H2O 1 (dpdo = 4,4′-bipyridine-N,N′-dioxide; 2,2′-bipy = 2,2′-bipyridine), has been hydrothermally synthesized and characterized by elemental analyses, IR, TG analyses, cyclic voltammetry, and single-crystal X-ray diffraction. Compound 1 is built up of [P2W18O62]6− cluster as the structural motif covalently linked by [Cu(2,2′-bipy)2]2+ coordination complexes to yield the 1D chains, which are further in close contact forming a 3D supramolecular framework via aromatic π–π stacking interactions and extensive hydrogen-bonding interactions among polyoxoanions, coordinated 2,2′-bipy organic ligands, free dpdo organic molecules and lattice water molecules.