Journal
ACS APPLIED NANO MATERIALS
Volume 2, Issue 10, Pages 6098-6102Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b01534
Keywords
MOFs; 9-connected Zr-6 nodes; low symmetry tricarboxylate ligand; NH3 capture; uncoordinated carboxylate groups
Funding
- Defense Threat Reduction Agency [HDTRA1-19-1-0007]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF) [NNCI-1542205]
- MRSEC program (NSF) at the Materials Research Center [DMR-1720139]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
- NSF [CHE-1048773, DMR-0521267]
- State of Illinois
- China Scholarship Council (CSC) [201806150078]
- National Natural Science Foundation of China [21878101]
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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 Zr-6 nodes, NU-300, assembled from low symmetry tricarboxylate ligands and Zr-6 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 (<0.01 bar). In situ infrared (IR) spectroscopy shows the interactions between Bronsted acidic sites and NH3, which suggests that NU-300 can be used as a sorbent for NH3 capture at low pressures.
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