A Wells–Dawson polyoxoanion-based hybrid compound containing a nonanuclear copper cluster

A Wells–Dawson type polyoxoanion-based hybrid compound, Cu9(μ2-OH)4(μ3-OH)2(H2O)8(Hptz)8(P2W18O62)2·30H2O (ptz = 5-(4-pyridyl)-tetrazolate) (1), has been hydrothermally synthesized and characterized by routine methods. In compound 1, a novel nonanuclear copper cluster is constructed from two tetranuclear [Cu4(μ2-OH)(μ3-OH)(Hptz)3]6 + moieties, linked to each other though one Cu4 ion with the aid of two μ2-OH and two ptz ligands. Then the P2W18 polyoxoanions bridge the nonanuclear copper clusters into a 1D ladder-like chain, in which the polyoxoanions and nonanuclear clusters act as two sides and middle rail of the ladder, respectively. The 1D chain is extended to a 3D supramolecular structure via hydrogen bonding interactions. The electrochemical property and magnetic behavior of compound 1 have been studied.