First Cationic Uranyl–Organic Framework with Anion-Exchange Capabilities

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• 作者：Zhuanling Bai ; Yanlong Wang ; Yuxiang Li ; Wei Liu ; Lanhua Chen ; Daopeng Sheng ; Juan Diwu ; Zhifang Chai ; Thomas E. Albrecht-Schmitt ; Shuao Wang
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：July 5, 2016
• 年：2016
• 卷：55
• 期：13
• 页码：6358-6360
• 全文大小：223K
• 年卷期：0
• ISSN：1520-510X

文摘

By controlling the extent of hydrolysis during the self-assembly process of a zwitterionic-based ligand with uranyl cations, we observed a structural evolution from the neutral uranyl–organic framework [(UO₂)₂(TTTPC)(OH)O(COOH)]·1.5DMF·7H₂O (SCU-6) to the first cationic uranyl–organic framework with the formula of [(UO₂)(HTTTPC)(OH)]Br·1.5DMF·4H₂O (SCU-7). The crystal structures of SCU-6 and SCU-7 are layers built with tetranuclear and dinuclear uranyl clusters, respectively. Exchangeable halide anions are present in the interlaminar spaces balancing the positive charge of layers in SCU-7. Therefore, SCU-7 is able to effectively remove perrhenate anions from aqueous solution. Meanwhile, the H₂PO₄^–-exchanged SCU-7 material exhibits a moderate proton conductivity of 8.70 × 10^–5 S cm^–1 at 50 °C and 90% relative humidity, representing nearly 80 times enhancement compared to the original material.