Ultramicroporous metal-organic frameworks for capillary gas chromatographic separation.

J Chromatogr A

Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China. Electronic address:

Published: November 2020

AI Article Synopsis

  • The study focused on fine-tuning SiF-containing metal-organic frameworks (SIFSIX) by substituting metal centers and ligands, which significantly altered the apertures from 8.3 Å to 3.8 Å, enhancing separation efficiency for alkane isomers.
  • SIFSIX-1-Zn, SIFSIX-1-Cu, and SIFSIX-3-Zn were identified as effective stationary phases for capillary gas chromatography, with SIFSIX-3-Zn showing the best performance in separating alkane isomers and benzene homologues.
  • The improved separation was attributed to the optimal size matching between the ultramicroporous structure of SIFSIX-3-Zn and the target analytes,

Article Abstract

Fine-tuning of the SiF-containing metal-organic frameworks (SIFSIX) through the substitution of metal centers and ligands changed the apertures from 8.3 Å to 3.8 Å, resulting in ultramicropores and notably improving the separation performance of alkane isomers. Herein, we reported SIFSIX-1-Zn, SIFSIX-1-Cu and SIFSIX-3-Zn as representative stationary phases for capillary gas chromatography (GC). The capillary column coated with ultramicroporous SIFSIX-3-Zn efficiently separated the alkane isomers and benzene homologues, which outperformed SIFSIX-1-Zn and SIFSIX-1-Cu. This resulted from size matching between the window of the ultramicroporous SIFSIX-3-Zn and the analytes, which was also supported by McReynolds constants, column efficiency and peak tailing effect. It opened up a new avenue for ultramicroporous materials in the chromatography separation of isomers.

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http://dx.doi.org/10.1016/j.chroma.2020.461604DOI Listing

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