Zirconium-Based Metal–Organic Framework with 9‑Connected Nodes for Ammonia Capture

Construction of multifunctional metal–organic frameworks (MOFs) with asymmetric connectivity have the potential to expand the scope of their utilization. Herein, we report a robust microporous Zr-based MOF with 9-connected Zr6 nodes, NU-300, assembled from low symmetry tricarboxylate ligands and Zr6 nodes. As indicated by single-crystal X-ray diffraction analysis, there exist uncoordinated carboxylate groups in the structure of NU-300 that can participate in ammonia (NH3) sorption through acid–base interactions which yield high uptake of NH3 at low pressure regions (3, which suggests that NU-300 can be used as a sorbent for NH3 capture at low pressures.