Synthesis,crystal structure and fluorescent characterization of a novel lanthanide tetraphosphonate with a layered structure |
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| Institution: | 1. Department of Chemistry, Capital Normal University, Beijing 100048, China;2. The College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China;3. School of Science, Minzu University of China, Beijing 100081, China;1. Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia;2. Australian Synchrotron, Australian Nuclear Science and Technology Organisation, 800 Blackburn Road, Clayton, VIC 3168, Australia;1. Dept. of Geosciences, Virginia Tech, Blacksburg, VA 24060, USA;2. Dept. of Chemistry, The George Washington University, 725 21st Street NW, Washington, DC 20052, USA |
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| Abstract: | Hydrothermal reactions of Gd(III) nitrate with N,N,N′,N′-tetramethylenephosphono-1,4-diaminobutane, (H2O3PCH2)2N–(CH2)4–N(CH2PO3H2)2 (H8L), afforded a novel Gd(III) phosphonate, namely, Gd(O3PCH2)(HO3PCH2)N(H)(CH2)4N(H)(CH2PO3H)2] · 2H2O, Gd(H5L)] · 2H2O. Its structure was established by a single-crystal X-ray diffraction study. In this compound, the Gd(III) ion is coordinated by eight phoshonate oxygen atoms from five different phosphonate groups, which belong to five different phosphonic ligands. Each Gd atom is connected with its neighboring Gd atoms by two phosphonate oxygens, forming a gadolinium phosphonate slab along the a-axis. Such slabs are bridged by tetraphosphonate H5L anions, resulting in a 〈0 1 1〉 layer with the butane groups toward the interlayer space. These layers are further interlinked by strong hydrogen bonds formed by uncoordinated phosphonate oxygens into a 3D supermolecular structure. Luminescent studies indicate that this compound exhibits a broad blue fluorescent emission band at 441 nm. |
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