Strong and Reversible Binding of Carbon Dioxide in a Green Metal鈥揙rganic Framework

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• 作者：Jeremiah J. Gassensmith ; Hiroyasu Furukawa ; Ronald A. Smaldone ; Ross S. Forgan ; Youssry Y. Botros ; Omar M. Yaghi ; J. Fraser Stoddart
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：October 5, 2011
• 年：2011
• 卷：133
• 期：39
• 页码：15312-15315
• 全文大小：798K
• 年卷期：v.133,no.39(October 5, 2011)
• ISSN：1520-5126

文摘

The efficient capture and storage of gaseous CO₂ is a pressing environmental problem. Although porous metal鈥搊rganic frameworks (MOFs) have been shown to be very effective at adsorbing CO₂ selectively by dint of dipole鈥搎uadruple interactions and/or ligation to open metal sites, the gas is not usually trapped covalently. Furthermore, the vast majority of these MOFs are fabricated from nonrenewable materials, often in the presence of harmful solvents, most of which are derived from petrochemical sources. Herein we report the highly selective adsorption of CO₂ by CD-MOF-2, a recently described green MOF consisting of the renewable cyclic oligosaccharide 纬-cyclodextrin and RbOH, by what is believed to be reversible carbon fixation involving carbonate formation and decomposition at room temperature. The process was monitored by solid-state ¹³C NMR spectroscopy as well as colorimetrically after a pH indicator was incorporated into CD-MOF-2 to signal the formation of carbonic acid functions within the nanoporous extended framework.