Mixed-Metal Zeolitic Imidazolate Frameworks and their Selective Capture of Wet Carbon Dioxide over Methane

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• 作者：Nhung T. T. Nguyen ; Tien N. H. Lo ; Jaheon Kim ; Huong T. D. Nguyen ; Toan B. Le ; Kyle E. Cordova ; Hiroyasu Furukawa
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：June 20, 2016
• 年：2016
• 卷：55
• 期：12
• 页码：6201-6207
• 全文大小：379K
• 年卷期：0
• ISSN：1520-510X

文摘

A presynthesized, square planar copper imidazole complex, [Cu(imidazole)₄](NO₃)₂, was utilized as a precursor in the synthesis of a new series of zeolitic imidazolate frameworks, termed ZIF-202, -203, and -204. The structures of all three members were solved by single-crystal X-ray diffraction analysis, which revealed ZIF-203 and -204 having successfully integrated square planar units within the backbones of their respective frameworks. As a result of this unit, the structures of both ZIF-203 and -204 were found to adopt unprecedented three-dimensional nets, namely, ntn and thl, respectively. One member of this series, ZIF-204, was demonstrated to be highly porous, exhibit exceptional stability in water, and selectively capture CO₂ over CH₄ under both dry and wet conditions without any loss in performance over three cycles. Remarkably, the regeneration of ZIF-204 was performed under the mild conditions of flowing a pure N₂ gas through the material at ambient temperature.