How Interpenetration Ensures Rigidity and Permanent Porosity in a Highly Flexible Hybrid Solid

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• 作者：Meenakshi Dan-Hardi ; Hubert Chevreau ; Thomas Devic ; Patricia Horcajada ; Guillaume Maurin ; G茅rard F茅rey ; Dmitry Popov ; Christian Riekel ; Stefan Wuttke ; Jean-Claude Lavalley ; Alexandre Vimont ; Tom Boudewijns ; Dirk de Vos ; Christian Serre
• 刊名：Chemistry of Materials
• 出版年：2012
• 出版时间：July 10, 2012
• 年：2012
• 卷：24
• 期：13
• 页码：2486-2492
• 全文大小：378K
• 年卷期：v.24,no.13(July 10, 2012)
• ISSN：1520-5002

文摘

The synthesis and the crystal structure determination, using a synchrotron microdiffraction setup, of the interwoven analogue of the highly flexible iron(III) dicarboxylate MIL-88D structure are reported. Unlike its flexible counterpart, MIL-126, or Fe^III₃O(H₂O)₂(OH)[(O₂C)-C₁₂H₈-(CO₂)]₃路n(solv), exhibits a rigid structure with an accessible three dimensional (3D) pore system resulting in a Brunauer鈥揈mmett鈥揟eller (BET) surface area over 1700 m²路g^鈥?. Moreover, a large amount of coordinatively unsaturated Fe sites of +2 and +3 oxidation states are accessible to NO and acetonitrile molecules as shown by infrared spectroscopy. MIL-126 might be thus used for the removal of aromatic N-heterocyclic compounds from fossil fuel streams, as shown here in the efficient capture of indole from model benzothiophene/indole mixtures in heptane/toluene.

Keywords:

metal鈭抩rganic framework; iron carboxylate; flexibility; interpenetration; acidity; infrared spectroscopy; purification