Evidence of amine-CO2 interactions in two pillared-layer MOFs probed by X-ray crystallography

Xiao Li Hu, Qi Han Gong, Rong Lin Zhong, Xin Long Wang, Chao Qin, Hao Wang, Jing Li, Kui Zhan Shao, Zhong Min Su

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23 Citations (Scopus)

Abstract

Two pillared-layer metal-organic frameworks (MOFs; PMOF-55 and NH2-PMOF-55) based on 1,2,4-triazole and terephthalic acid (bdc)/NH2-bdc ligands were assembled and display framework stabilities, to a certain degree, in both acid/alkaline solutions and toward water. They exhibit high CO2 uptakes and selective CO2/N2 adsorption capacities, with CO2/N2 selectivity in the range of 24-27, as calculated by the ideal adsorbed solution theory method. More remarkably, the site and interactions between the host network and the CO2 molecules were investigated by single-crystal X-ray diffraction, which showed that the main interaction between the CO2 molecules and PMOF-55 is due to multipoint supramolecular interactions of C-H⋯O, C⋯O, and O⋯O. Amino functional groups were shown to enhance the CO2 adsorption and identified as strong adsorption sites for CO2 by X-ray crystallography.

Original languageEnglish
Pages (from-to)7238-7244
Number of pages7
JournalChemistry - A European Journal
Volume21
Issue number19
DOIs
Publication statusPublished - May 4 2015

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Keywords

  • X-ray diffraction
  • adsorption
  • carbon dioxide
  • metal-organic frameworks
  • pillared-layer

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

Cite this

Hu, X. L., Gong, Q. H., Zhong, R. L., Wang, X. L., Qin, C., Wang, H., Li, J., Shao, K. Z., & Su, Z. M. (2015). Evidence of amine-CO2 interactions in two pillared-layer MOFs probed by X-ray crystallography. Chemistry - A European Journal, 21(19), 7238-7244. https://doi.org/10.1002/chem.201406495