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Smoljan, Courtney S.; Li, Zhao; Xie, Haomiao; Setter, Caitlin J.; Idrees, Karam B.; Son, Florencia A.; Formalik, Filip; Shafaie, Saman; Islamoglu, Timur; Macreadie, Lauren K.; Snurr, Randall Q.; Farha, Omar K.
Journal of the American Chemical Society, 03/2023, Volume: 145, Issue: 11Journal Article
Metal–organic frameworks (MOFs) are highly tunable materials with potential for use as porous media in non-thermal adsorption or membrane-based separations. However, many separations target molecules with sub-angstrom differences in size, requiring precise control over the pore size. Herein, we demonstrate that this precise control can be achieved by installing a three-dimensional linker in an MOF with one-dimensional channels. Specifically, we synthesized single crystals and bulk powder of NU-2002, an isostructural framework to MIL-53 with bicyclo1.1.1pentane-1,3-dicarboxylic acid as the organic linker component. Using variable-temperature X-ray diffraction studies, we show that increasing linker dimensionality limits structural breathing relative to MIL-53. Furthermore, single-component adsorption isotherms demonstrate the efficacy of this material for separating hexane isomers based on the different sizes and shapes of these isomers.
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