Dehydration-Induced Cluster Consolidation in a Metal-Organic Framework for Sieving Hexane Isomers

Angew Chem Int Ed Engl. 2024 Apr 22:e202403209. doi: 10.1002/anie.202403209. Online ahead of print.ABSTRACTMetal-organic frameworks (MOFs) that exhibit dynamic phase-transition behavior under external stimuli could have great potential in adsorptive separations. Here we report on a zinc-based microporous MOF (JNU-80) and its reversible transformation between two crystalline phases: large pore (JNU-80-LP) and narrow pore (JNU-80-NP). Specifically, JNU-80-LP can undergo a dehydration-induced cluster consolidation under heat treatment, resulting in JNU-80-NP with a reduced channel that allows exclusion of di-branched hexane isomers while high adsorption of linear and mono-branched hexane isomers. We further demonstrate the fabrication of MOF-polymer composite (JNU-80-NP-block) and its application in the purification of di-branched isomers from liquid-phase hexane mixtures (98% di-branched) at room temperature, affording the di-branched hexane isomers with 99.5% purity and close to 90% recovery rate over ten cycles. This work illustrates an interesting dehydration-induced cluster consolidation in MOF structure and the ensuing channel shrinkage for sieving di-branched hexane isomers, which may have important implications for the development of MOFs with dynamic behavior and their potential applications in non-thermal driven separation technologies.PMID:38647582 | DOI:10.1002/anie.202403209

Source: Angewandte Chemie - April 22, 2024 Category: Chemistry Authors: Zhi-Jie Jiang Ying Wang Dong Luo Rong-Jia Wei Weigang Lu Dan Li Source Type: research