Two new hybrids built upon Wells-Dawson polyoxoanions and copper–ethylendiamine coordination cations

Abstract Two new organic-inorganic hybrid copper-substituted supramolecular polyoxotungstates, namely H[Cu(en)2(H2O)]2[Cu(en)2][P2W18O62]Cl·7H2O (1) and H3[Cu(en)2(H2O)]2[Cu(en)2]1.5[CuP2W17O62]·39H2O (2) (en = 1,2-ethylenediamine), have been prepared via a simple one-pot hydrothermal synthesis method and characterized by elemental analyses, IR spectra, XRD, thermogravimetric (TG) analyses and X-ray single-crystal diffraction. X-ray structural analysis reveals that both of them are containing Wells-Dawson polyoxoanions and copper-en cations. With the rare connection modes of W O Cu and W O W linkers, compound 1 further displays an organic-inorganic hybrid 1D ladder-like mono-chain whereas 2 is in a stable configuration of an interesting double-chain. Subsequently, the intriguing 2D double-layer for 1 and 3D supramolecular architecture for 2 were fabricated through hydrogen bonding among the [P2W18O62]6− fragments and the copper counter-cations, respectively. It is worthy to note that the connection modes and the packing networks of the title hybrid complexes are rare. In addition, the photodegradation properties of the title complexes for methylene blue under UV irradiation have been investigated in detail. This work guides us to design and synthesize more attractive hybrid materials for extensively potential applications.