In situ synchrotron IR microspectroscopy of CO2 adsorption on single crystals of the functionalised MOF, Sc2(BDC-NH2)3

Alex Greenaway, Berenice Gonzalez Santiago, Paul Donaldson, Mark Frogley, Gianfelice Cinque, Jorge Sotelo, Stephen Moggach, Elenica Shiko, Stefano Brandani, Russell Howe*, Paul Anthony Wright*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)
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Abstract

Synchrotron radiation (SR) IR microspectroscopy has enabled determination of the thermodynamics, kinetics, and molecular orientation of CO2 adsorbed in single microcrystals of a functionalized metal–organic framework (MOF) under conditions relevant to carbon capture from flue gases. Single crystals of the small-pore MOF, Sc2(BDC-NH2)3, (BDC-NH2=2-amino-1,4-benzenedicarboxylate), with well-defined crystal form have been investigated during CO2 uptake at partial pressures of 0.025-0.2 bar at 298–373 K. The enthalpy and diffusivity of adsorption determined from individual single crystals are consistent with values obtained from measurements on bulk samples. The brilliant SR IR source permits rapid collection of polarized spectra. Strong variations in absorbance of the symmetric stretch of the NH2 groups of the MOF and the asymmetric stretch of the adsorbed CO2 at different orientations of the crystals relative to the polarized IR light show that CO2 molecules align along channels in the MOF.

Original languageEnglish
Pages (from-to)13483-13487
Number of pages4
JournalAngewandte Chemie International Edition
Volume53
Issue number49
Early online date7 Nov 2014
DOIs
Publication statusPublished - 27 Nov 2014

Keywords

  • Analytical methods
  • Carbon dioxide adsoption
  • IR spectroscopy
  • Metal-organic frameworks
  • Single crystals

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