A selenophene-incorporated metal–organic framework for enhanced CO2 uptake and adsorption selectivity

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A new metal–organic coordination polymer [Zn2(sedc)2(dabco)] (1se; sedc2− = selepophene-2, 5-dicarboxylate; dabco = 1,4-diazabicyclo[2.2.2]octane) was synthesized and characterized by single-crystal X-ray diffraction analysis. This MOF is based on {Zn2(OOCR)4N2} paddle wheels and is isoreticular to the family of [Zn2(bdc)2(dabco)] derivatives (1b; bdc2− = 1,4-benzenedicarboxylate) with pcu topology. The gas adsorption measurements revealed that 1se shows a 15% higher CO2 volumetric uptake at 273 K and 28% higher CO2 uptake at 298 K (both at 1 bar) compared to the prototypic framework 1b. Methane and nitrogen adsorption at 273 K was also investigated, and IAST calculations demonstrated a pronounced increase in CO2/CH4 and CO2/N2 selectivity for 1se, compared with 1b. For example, the selectivity factor for the equimolar CO2/CH4 gas mixture at 1 bar = 15.1 for 1se and 11.9 for 1b. The obtained results show a remarkable effect of the presence of selenium atom on the carbon dioxide affinity in the isoreticular metal–organic frameworks with very similar geometry and porosity.

Original languageEnglish
Article number4396
Number of pages12
Issue number19
Publication statusPublished - Oct 2020


  • Adsorption measurements
  • Gas adsorption selectivity
  • Porous metal–organic frameworks
  • Selenophene
  • X-ray diffraction studies
  • ACID
  • adsorption measurements
  • selenophene
  • MOF
  • gas adsorption selectivity
  • porous metal&#8211
  • organic frameworks
  • ZR


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