Breathing-Assisted Selective Adsorption of C-8 Alkyl Aromatics in Zn-Based Metal-Organic Frameworks
- Authors
- Lee, Jihyun; Kim, Younghoon; Son, Younghu; Kim, Hyehyun; Choi, Yong Nam; D'Alessandro, Deanna; Rao, Purna Chandra; Yoon, Minyoung
- Issue Date
- 25-Oct-2021
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- adsorption; breathing effect; flexibility; isomer separation; metal-organic frameworks
- Citation
- CHEMISTRY-A EUROPEAN JOURNAL, v.27, no.60, pp.14851 - 14857
- Journal Title
- CHEMISTRY-A EUROPEAN JOURNAL
- Volume
- 27
- Number
- 60
- Start Page
- 14851
- End Page
- 14857
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/82642
- DOI
- 10.1002/chem.202102640
- ISSN
- 0947-6539
- Abstract
- The breathing phenomenon in metal-organic frameworks (MOFs) has revealed supramolecular host-guest interactions that could be beneficial for chemical separation in numerous industrial applications. The cost-effective purification of C8 alkyl aromatics such as o-xylene, m-xylene, p-xylene, and ethylbenzene remains challenging owing to their similar molecular structures, boiling points, kinetic diameters, polarities, etc. Herein, we report two Zn-based pillar-bilayered MOFs, denoted [Zn2(aip)2(pillar)] (aip=5-aminoisophthalic acid; pillar: bpy=4,4’-bipyridine or bpe=1,2-bis(4-pyridyl)ethane) that exhibit a breathing effect depending on the adsorbed guest molecules. Guest-dependent sorption studies in organic solvents such as N,N-dimethylformamide, methanol, benzene, and water vapor display reversible structural flexibility through the breathing effect in both framework compounds. The experiments conducted on C8-alkyl aromatics resulting in both MOF compounds can access these isomers in the shrunken pores, and thereby expand the pore size by framework breathing. In C8 binary mixtures, these Zn-MOFs exhibit selective sorption properties based on the different interactions between guest C8 aromatics and the framework structure. © 2021 Wiley-VCH GmbH
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