MOF‐Directed Synthesis of Crystalline Ionic Liquids with Enhanced Proton Conduction

作者：Wen‐Long Xue, Weihua Deng, Hui Chen, Rui‐Heng Liu, Jared M. Taylor, Yu‐kun Li, Lu Wang, Yu‐Heng Deng, Wenhua Li, Yingyi Wen, Guan‐E Wang, Chong‐Qing Wan, Gang Xu · 发表于：Angewandte Chemie International Edition · 年份：2020 · DOI：10.1002/anie.202010783 · 被引用次数：182 · 研究领域：Ionic liquids properties and applications、Metal-Organic Frameworks: Synthesis and Applications、Covalent Organic Framework Applications

Abstract Arranging ionic liquids (ILs) with long‐range order can not only enhance their performance in a desired application, but can also help elucidate the vital between structure and properties. However, this is still a challenge and no example has been reported to date. Herein, we report a feasible strategy to achieve a crystalline IL via coordination self‐assembly based reticular chemistry. IL 1 MOF , was prepared by designing an IL bridging ligand and then connecting them with metal clusters. IL 1 MOF has a unique structure, where the IL ligands are arranged on a long‐range ordered framework but have a labile ionic center. This structure enables IL 1 MOF to break through the typical limitation where the solid ILs have lower proton conductivity than their counterpart bulk ILs. IL 1 MOF shows 2–4 orders of magnitude higher proton conductivity than its counterpart IL monomer across a wide temperature range. Moreover, by confining the IL within ultramicropores (<1 nm), IL 1 MOF suppresses the liquid–solid phase transition temperatures to lower than −150 °C, allowing it to function with high conductivity in a subzero temperature range.