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. This research work focuses on the design and synthesis of three new 3D Ce(III)-based ZW MOFs using the rigid di-topic ZW ligand [1-(4-carboxybenzyl)-4’-carboxypyridinium bromide, H<sub>2</sub>LBr]. This ligand features both cationic (pyridinium) and anionic moieties (carboxylate) to bind cerium(III) under solvothermal conditions leading. The resulting charge separated MOFs feature interesting coordination, electronic, and optical properties. All new MOF structures were characterized by single-crystal X-ray diffraction, thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD) and UV-vis diffuse reflectance spectroscopy. Additionally, solid state photoluminescence properties at room temperature have been systematically investigated toward the exploration of sensing application.

Design and characterization of zwitterionic cerium(III)-based MOFs

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