Novel 1-D double-chain organic–inorganic hybrid polyoxotungstates constructed from dimeric copper–lanthanide heterometallic silicotungstate units

Abstract

A series of novel 1-D double-chain organic–inorganic hybrid polyoxotungstates [Cu(dap)2(H2O)]2{Cu(dap)2[α-H2SiW11O39Ln(H2O)3]2}·xH2O [Ln = CeIII, x = 9 (1); Ln = PrIII, x = 10 (2), Ln = NdIII, x = 10 (3), Ln = SmIII, x = 10 (4), Ln = EuIII, x = 10 (5), Ln = GdIII, x = 9 (6), Ln = TbIII, x = 8 (7), Ln = DyIII, x = 8 (8), Ln = ErIII, x = 9 (9)] (dap = 1,2-diaminopropane) have been hydrothermally prepared and structurally characterized by elemental analyses, inductively coupled plasma atomic emission spectrometry, IR spectra, UV-Vis spectra, thermogravimetric analyses and single-crystal X-ray diffraction. Compounds 1–9 are isomorphic and display the novel 1-D double-chain built by dimeric copper–lanthanide heterometallic silicotungstate units by means of the bridging role of the lanthanide cations, to our knowledge, which represent the first organic–inorganic hybrid 1-D double-chain copper–lanthanide heterometallic polyoxometalates. The variable-temperature magnetic susceptibilities of 2, 3, 6 and 8 have been investigated. The solid-state photoluminescence properties of 4, 5, 7 and 8 have been measured at room temperature.