A bimetallic oxide framework, [{Cu(bpy)}2Mo4O10(O3PCH2C6H4CH2PO3)2], constructed from novel image chains

The hydrothermal reaction of Cu(CH3CO2)2·H2O, MoO3, 2,2′-bipyridine (bpy), and p-xylene diphosphonic acid in the presence of HF provided blue crystals of the bimetallic oxide phase [{Cu(bpy)}2Mo4O10(O3PCH2C6H4CH2PO3)2] (1). The three-dimensional structure of 1 is constructed from image chains, decorated with {Cu(bpy)}2+ subunits and linked through the p-xylyl tether of the diphosphonate ligand. The molybdate building block within the chain is a tetranuclear {Mo4O10(O3P)8} cluster of edge- and corner-sharing {MoO6} octahedra. Each phosphomolybdate chain is linked to four adjacent chains to generate the three-dimensional connectivity. Crystal data: C18H16CuMo2N2O11P2, fw = 753.69: monoclinic P21/c, a = 7.9719(8) Å, b = 14.0392(14) Å, c = 21.274(2) Å, β = 94.585(3)°, V = 2373.3(4) Å3, Z = 4, Dcalc = 2.109 g cm−3, R1 = 0.0610.