Synthesis, structure and properties of three-dimensional organic-inorganic hybrids based on 伪-metatungstate
- 作者：Hua-Xin Meng ; Ya-Guang Chen ; chenyg146@nenu.edu.cn ; Ming-Guan Liu ; Dan-Dan Liu ; Zhi-Chao Zhang ; Chun-Xia Zhang ; Shu-Xia Liu
- 关键词：伪-Metatungstate ; Three-dimensional structure ; Conventional synthesis ; Polyoxometalates ; Lanthanides
- 刊名：Inorganica Chimica Acta
- 出版年：2012
- 期刊代码：40_00201693
- 类别：ch
- 出版时间：30 May, 2012
- 卷：387
- 期：Complete
- 页码：8-14
- 文件大小：1406 K
摘要
Four new organic-inorganic hybrids with three-dimensional (3D) framework based on the 伪-metatungstate clusters [H2W12O40]6鈭?/sup>, (NH4)2[Ln2(L)2(H2W12O40)(H2O)7]路nH2O (Ln = CeIII (1), n = 9; PrIII (2), n = 12; NdIII (3), n = 11; SmIII (4), n = 10; L = 2-pyrazinecarboxylate), have been conventionally synthesized and structurally characterized by single-crystal X-ray diffraction analyses, elemental analyses, IR spectra and thermal gravimetric analyses. Single-crystal X-ray diffraction analyses reveal these compounds are isostructural with a P2(1)/c space group. And L ligand connects two kinds of Ln3+ ions in a tridentate chelating-bridging coordination mode, resulting in two sorts of infinite one-dimensional (1D) zigzag chains. [H2W12O40]6鈭?/sup> cluster acting as a pentadentate linker connects five Ln3+ ions from three zigzag chains through its five terminal oxygen atoms, forming a complicated 3D framework structure with a novel (32415261)(32425363)(3143536172) topology. In compounds 1-4, there exist S-type channels with maximum length of ca. 12.563 脜 and minimum length of ca. 3.888 脜 along the a-axis direction. In addition, solid-state luminescence properties of compounds 1, 2, 4 and 2-pyrazinecarboxylic acid (HL) have been studied at room temperature.