Construction of a Polyhedral Metal鈥揙rganic Framework via a Flexible Octacarboxylate Ligand for Gas Adsorption and Separation

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• 作者：Zu-Jin Lin ; Yuan-Biao Huang ; Tian-Fu Liu ; Xiang-Ying Li ; Rong Cao
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：March 18, 2013
• 年：2013
• 卷：52
• 期：6
• 页码：3127-3132
• 全文大小：363K
• 年卷期：v.52,no.6(March 18, 2013)
• ISSN：1520-510X

文摘

A flexible octacarboxylate ligand, tetrakis[(3,5-dicarboxyphenyl)oxamethyl]methane (H₈X), has been used to construct a highly porous metal鈥搊rganic framework (In₂X)(Me₂NH₂)₂(DMF)₉(H₂O)₅ (1), which is comprised of octahedral and cuboctahedral cages and shows a rare (4,8)-connected scu topology. Gas adsorption studies of N₂, H₂ on the actived 1 at 77 K reveal a Langmuir surface area of 1707 m² g^鈥?, a BET surface area of 1555 m² g^鈥?, a total pore volume of 0.62 cm³ g^鈥?, and a H₂ uptake of 1.49 wt % at 1 bar and 3.05 wt % at 16 bar. CO₂, CH₄, and N₂ adsorption studies at 195, 273, 285, and 298 K and also ideal adsorbed solution theory (IAST) calculations demonstrate that 1 has high selectivites of CO₂ over CH₄ and N₂. The resulting framework represents a MOF with the highest gas uptakes and gas selectivities (CO₂ over CH₄ and N₂) constructed by flexible ligands.