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- W1976291286 abstract "The 3D framework possesses a novel (3 2 4 1 5 2 6 1 )(3 2 4 2 5 3 6 3 )(3 1 4 3 5 3 6 1 7 2 ) topology in compound 1 . ► Four new 3-D organic–inorganic hybrids based on lanthanide cations and W 12 clusters. ► The ringing coordination effect of 2-pyrazinecarboxylate and W 12 to Ln ions is found. ► The 3D framework possesses a novel (3 2 4 1 5 2 6 1 )(3 2 4 2 5 3 6 3 )(3 1 4 3 5 3 6 1 7 2 ) topology. Four new organic–inorganic hybrids with three-dimensional (3D) framework based on the α-metatungstate clusters [H 2 W 12 O 40 ] 6− , (NH 4 ) 2 [Ln 2 (L) 2 (H 2 W 12 O 40 )(H 2 O) 7 ]· n H 2 O (Ln = Ce III ( 1 ), n = 9; Pr III ( 2 ), n = 12; Nd III ( 3 ), n = 11; Sm III ( 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 P 2(1)/ c space group. And L ligand connects two kinds of Ln 3+ ions in a tridentate chelating-bridging coordination mode, resulting in two sorts of infinite one-dimensional (1D) zigzag chains. [H 2 W 12 O 40 ] 6− cluster acting as a pentadentate linker connects five Ln 3+ ions from three zigzag chains through its five terminal oxygen atoms, forming a complicated 3D framework structure with a novel (3 2 4 1 5 2 6 1 )(3 2 4 2 5 3 6 3 )(3 1 4 3 5 3 6 1 7 2 ) topology. In compounds 1 – 4 , there exist S-type channels with maximum length of ca. 12.563 Å and minimum length of ca. 3.888 Å 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." @default.
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- W1976291286 date "2012-05-01" @default.
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- W1976291286 title "Synthesis, structure and properties of three-dimensional organic–inorganic hybrids based on α-metatungstate" @default.
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- W1976291286 doi "https://doi.org/10.1016/j.ica.2011.12.036" @default.
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