A Porous Sulfonated 2D Zirconium Metal–Organic Framework as a Robust Platform for Proton Conduction |
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Authors: | Monika Szufla Aleksandra Choro? Dr Wojciech Nitek Prof Dariusz Matoga |
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Institution: | Faculty of Chemistry, Jagiellonian University, 30-387 Kraków, Gronostajowa 2, Poland |
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Abstract: | By using the strategy of pre-assembly chlorosulfonation applied to a linker precursor, the first sulfonated zirconium metal–organic framework ( JUK-14 ) with two-dimensional (2D) structure, was synthesized. Single-crystal X-ray diffraction reveals that the material is built of Zr6O4(OH)4(COO)8 oxoclusters, doubly 4-connected by angular dicarboxylates, and stacked in layers spaced 1.5 nm apart by the presence of sulfonic groups. JUK-14 exhibits excellent hydrothermal stability, permanent porosity confirmed by gas adsorption studies, and shows high (>10?4 S/cm) and low (<10?8 S/cm) proton conductivity under humidified and anhydrous conditions, respectively. Post-synthesis inclusion of imidazole improves the overall conductivity increasing it to 1.7×10?3 S/cm at 60 °C and 90 % relative humidity, and by 3 orders of magnitude at 160 °C. The combination of 2D porous nature with robustness of zirconium MOFs offers new opportunities for exploration of the material towards energy and environmental applications. |
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Keywords: | metal–organic frameworks zirconium proton conduction 2D materials synthesis |
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