| Affiliation: | 1. Department of Chemistry & Chemical Biology, University of New Mexico, MSC03-2060 1 UNM, Albuquerque, NM, 87131 USA These authors contributed equally to this work.;2. Department of Chemistry, New Mexico Institute of Mining and Technology, 801 Leroy Pl., Socorro, NM 87801 USA;3. Department of Chemistry & Chemical Biology, University of New Mexico, MSC03-2060 1 UNM, Albuquerque, NM, 87131 USA;4. Department of Chemistry, University of Virginia, 409 McCormick Rd., Charlottesville, VA, 22904 USA;5. Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Bikini Atoll Rd., SM30, Los Alamos, NM 87801 USA;6. IR Dynamics, LLC, 6901 Gruber Ave. NE, Suite G, Albuquerque, NM, 87109 USA |
| Abstract: | Charge-separated metal–organic frameworks (MOFs) are a unique class of MOFs that can possess added properties originating from the exposed ionic species. A new charge-separated MOF, namely, UNM-6 synthesized from a tetrahedral borate ligand and Co2+ cation is reported herein. UNM-6 crystalizes into the highly symmetric P43n space group with fourfold interpenetration, despite the stoichiometric imbalance between the B and Co atoms, which also leads to loosely bound NO3− anions within the crystal structure. These NO3− ions can be quantitatively exchanged with various other anions, leading to Lewis acid (Co2+) and Lewis base (anions) pairs within the pores and potentially cooperative catalytic activities. For example, UNM-6-Br, the MOF after anion exchange with Br− anions, displays high catalytic activity and stability in reactions of CO2 chemical fixation into cyclic carbonates. |
