Metal-organic frameworks (MOFs) are crystalline porous materials composed of metal ions or clusters connected by functionality-tunable polytopic organic linkers into three-dimensional porous structures. Their key features include high surface area to mass ratios and large pore volumes rendering MOFs as the perfect platform for diverse host-guest chemistry. This work entails the design, synthesis, and characterization of a series of linear, neutrally charged pyridinium- and carboxylate-based zwitterionic MOFs. The variation of the chemical environment of the N<sup>+</sup> atom of the pyridinium ring is of particular interest. Using these ligands, a series of isoreticular zwitterionic MOFs were synthesized by varying the identity of the zwitterionic ligands, metal salt(s), and dicarboxylate co-ligands used. Modern solid state analytical techniques and theoretical calculations were employed to investigate important structure-property relationships with focus on their selective gas adsorption properties, stimulus-responsive chromic reduction of pyridinium, and separation of charged organic dyes from solution.

Effects of isoreticulation and regioisomerism on a series of ncb topology zwitterionic metal-organic frameworks

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ACS Fall 2022

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