Isoreticular Three-Dimensional Kagome Metal–Organic Frameworks with Open-Nitrogen-Donor Pillars for Selective Gas Adsorption

Here, we report a double-bent-ligand strategy which addresses a commonly encountered challenge in the construction of pillar-layered structures with corrugated layers which are common for nonlinearly coordinated ligands and low-symmetry chiral ligands. Specifically, we show here that out-of-alignmen...

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Veröffentlicht in:Crystal growth & design 2020-05, Vol.20 (5), p.3523-3530
Hauptverfasser: Dinh, Andy, Yang, Huajun, Peng, Fang, Nguyen, Tony C, Hong, Anh, Feng, Pingyun, Bu, Xianhui
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Sprache:eng
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Zusammenfassung:Here, we report a double-bent-ligand strategy which addresses a commonly encountered challenge in the construction of pillar-layered structures with corrugated layers which are common for nonlinearly coordinated ligands and low-symmetry chiral ligands. Specifically, we show here that out-of-alignment metal coordination sites between two adjacent and opposing layers caused by in-layer bent-type ligands could be joined by another ligand type with a matching bent angle. Two isoreticular metal–organic frameworks, CPM-63m and CPM-63a, are presented here to illustrate the implementation of this strategy. Specifically, [Zn2(RCOO)4] paddlewheel dimers are bridged by bent FDC2– (H2FDC = 2,5-furandicarboxylic acid) to form neutral kagome layers. The resulting corrugated layers are successfully pillared by bent MTZ– (HMTZ = 5-methyltetrazole) or ATZ– ligands (HATZ = 5-aminotetrazole). Furthermore, the MTZ– and ATZ– pillars offer open N-donor sites, and gas sorption studies of N2, CO2, CH4, C2H2, C2H4, and C2H6 show that these materials are highly porous. In addition, they exhibit interesting inverse ethane/ethylene separation properties and good CO2/CH4 separation.
ISSN:1528-7483
1528-7505
DOI:10.1021/acs.cgd.0c00352