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CD-MOF: A Versatile Separation Medium

Lookup NU author(s): James Holcroft


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© 2016 American Chemical Society.Porous metal-organic frameworks (MOFs) have been studied in the context of a wide variety of applications, particularly in relation to molecular storage and separation sciences. Recently, we reported a green, renewable framework material composed of γ-cyclodextrin (γ-CD) and alkali metal salts - namely, CD-MOF. This porous material has been shown to facilitate the separation of mixtures of alkylaromatic compounds, including the BTEX mixture (benzene, toluene, ethylbenzene, and the regioisomers of xylene), into their pure components, in both the liquid and gas phases, in an energy-efficient manner which could have implications for the petrochemical industry. Here, we report the ability of CD-MOF to separate a wide variety of mixtures, including ethylbenzene from styrene, haloaromatics, terpinenes, pinenes and other chiral compounds. CD-MOF retains saturated compounds to a greater extent than their unsaturated analogues. Also, the location of a double bond within a molecule influences its retention within the extended framework, as revealed in the case of the structural isomers of pinene and terpinine, where the isomers with exocyclic double bonds are more highly retained than those with endocyclic double bonds. The ability of CD-MOF to separate various mono- and disubstituted haloaromatic compounds appears to be controlled by both the size of the halogen substituents and the strength of the noncovalent bonding interactions between the analyte and the framework, an observation which has been confirmed by molecular simulations. Since CD-MOF is a homochiral framework, it is also able to resolve the enantiomers of chiral analytes, including those of limonene and 1-phenylethanol. These findings could lead to cheaper and easier-to-prepare stationary phases for HPLC separations when compared with other chiral stationary phases, such as CD-bonded silica particles.

Publication metadata

Author(s): Hartlieb KJ, Holcroft JM, Moghadam PZ, Vermeulen NA, Algaradah MM, Nassar MS, Botros YY, Snurr RQ, Stoddart JF

Publication type: Article

Publication status: Published

Journal: Journal of the American Chemical Society

Year: 2016

Volume: 138

Issue: 7

Pages: 2292-2301

Online publication date: 27/01/2016

Acceptance date: 01/01/1900

ISSN (print): 0002-7863

ISSN (electronic): 1520-5126

Publisher: American Chemical Society


DOI: 10.1021/jacs.5b12860


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