Sequential Pore Wall Modification in a Covalent Organic Framework for Application in Lactic Acid Adsorption

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• 作者：Maria S. Lohse ; Timothée Stassin ; Guillaume Naudin ; Stefan Wuttke ; Rob Ameloot ; Dirk De Vos ; Dana D. Medina ; Thomas Bein
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：January 26, 2016
• 年：2016
• 卷：28
• 期：2
• 页码：626-631
• 全文大小：397K
• ISSN：1520-5002

文摘

Here we describe the synthesis and postsynthetic modification of the stable β-ketoenamine TpBD(NH₂)₂ covalent organic framework (COF), having primary amine groups integrated into the pore walls. For this purpose we initially synthesized the nitro version of this COF, TpBD(NO₂)₂. Afterward, TpBD(NO₂)₂ was reduced to afford the desired framework having primary amine functionality. We demonstrate the accessibility of the primary amine groups and the robustness of the framework by a second modification step, the aminolysis of acetic anhydride, to obtain the corresponding amide form TpBD(NHCOCH₃)₂. Taking advantage of the high stability of these frameworks under acidic conditions, we study the liquid-phase adsorption of lactic acid, revealing the strong impact of a pore wall modification on the adsorption performance.