Ultramicroporous metal-organic frameworks for capillary gas chromatographic separation

Sha-Sha Meng; Ze-Rong Tao; Wen-Qi Tang; Ting Han; Yan Du; Zhi-Yuan Gu

doi:10.1016/j.chroma.2020.461604

Ultramicroporous metal-organic frameworks for capillary gas chromatographic separation

J Chromatogr A. 2020 Nov 22:1632:461604. doi: 10.1016/j.chroma.2020.461604. Epub 2020 Oct 10.

Authors

Sha-Sha Meng¹, Ze-Rong Tao², Wen-Qi Tang¹, Ting Han¹, Yan Du¹, Zhi-Yuan Gu³

Affiliations

¹ 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.
² 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; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
³ 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: guzhiyuan@njnu.edu.cn.

PMID: 33080532
DOI: 10.1016/j.chroma.2020.461604

Abstract

Fine-tuning of the SiF₆^2--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.

Keywords: Gas chromatography; Isomers; Metal-organic frameworks; SIFSIX; Separation; Ultramicroporous.

MeSH terms

Alkanes / chemistry
Benzene / chemistry
Chromatography, Gas / methods*
Isomerism
Metal-Organic Frameworks / chemistry*
Porosity

Substances

Alkanes
Metal-Organic Frameworks
Benzene