Four novel compounds based on α-metatungstate [H2W12O40]6-(W12) and Lnorganic complexes, (NH4)4[Ln2(L)2(H2O)9(H2W12O40)] ·nH2O (Ln=EuIII(1), GdIII(2), DyIII(4), n=11; TbIII(3), n=12; L=pyridine-3,5- dicarboxylate dianion) have been synthesized in aqueous solution and characterized by element analysis, IR spectrometry and thermogravimetric analysis. Single-crystal X-ray diffraction analyses reveal these compounds are isostructural with a P21/n space group. The W12cluster acting as a tridentate ligand connects three Ln3ions, in turn, each Ln2 ion links two W12clusters, as a result, a W12Ln polymeric chain is formed. Coordination of pyridine-3,5-dicarboxylate ligands to the Ln3ions leads to a LnL polymeric chain. The two chains, W12Ln and LnL, share Ln2 ions, resulting in a 2-D layer. Ring coordination of pyridine-3,5-dicarboxylate and W12to the Ln ions changes some bond angles of W12that leads to a slight distortion of W12and splitting of vibration band of WOcW. Solid-state photoluminescence properties of compounds 1-4 have been investigated. © 2011 Elsevier Inc. All rights reserved.
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