Metal-Organic Frameworks (MOFs) are an emerging class of crystalline nanoporous materials which have shown promising properties for diverse applications such as gas storage, small molecule separation, catalysis, and sensing. Zwitterionic (ZW) ligand incorporation into MOFs has shown as promising means to introduce Lewis-acidic charged organic surfaces which have the potential to polarize guest molecules and thus improving their host-guest interactions. The novelty of this work lies in the implementation of a unique rigid di-topic zwitterionic ligand (H2LBr) containing both cationic (pyridinium) and anionic (carboxylate) moieties to bind metals in different oxidation states leading to charge separated MOF structures with tailored properties. We studied the influence of H2LBr on RE(III) metal ions under solvothermal/hydrothermal conditions leading to a series of new ZW MOFs in single crystalline forms which demonstrate to have interesting properties for sensing of small molecules. This work highlights the versatility of H2LBr in engineering charge-separated MOFs with diverse structures and structure property relationship.

Design and characterization of rare earth MOFs from a zwitterionic pyridinium-based carboxylate ligand

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ACS Fall 2022

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