An organic–inorganic hybrid 1-D double-chain copper–yttrium heterometallic silicotungstate [Cu(dap)2(H2O)]2{Cu(dap)2[α-H2SiW11O39Y(H2O)2]2}·10H2O

An organic–inorganic hybrid 1-D double-chain CuII–YIII heterometallic silicotungstate [Cu(dap)2(H2O)]2 {Cu(dap)2[α-H2SiW11O39Y(H2O)2]2}·10H2O (1) has been synthesized by reaction of Na10[A-α-SiW9O34]·18H2O, CuCl2·2H2O, YCl3 and dap (dap = 1,2-diaminopropane) under hydrothermal conditions and characterized by elemental analyses, IR spectrum, UV spectrum and single-crystal X-ray diffraction. 1 exhibits a novel 1-D double-chain structure constructed from dimeric CuII–YIII heterometallic silicotungstate units. To our knowledge, 1 is the first organic–inorganic hybrid 1-D double-chain CuII–YIII heterometallic polyoxometalate. Thermogravimetry-differential thermal analysis of 1 has been measured from 25 to 750 °C and the thermogravimetric curve indicates two steps of weight loss.