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- Title
In situ Synchrotron IR Microspectroscopy of CO<sub>2</sub> Adsorption on Single Crystals of the Functionalized MOF Sc<sub>2</sub>(BDC-NH<sub>2</sub>)<sub>3</sub>.
- Authors
Greenaway, Alex; Gonzalez ‐ Santiago, Berenice; Donaldson, Paul M.; Frogley, Mark D.; Cinque, Gianfelice; Sotelo, Jorge; Moggach, Stephen; Shiko, Elenica; Brandani, Stefano; Howe, Russell F.; Wright, Paul A.
- 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 welldefined 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.
- Subjects
CARBON dioxide adsorption; INFRARED spectroscopy; SINGLE crystals; METAL-organic frameworks; SCANDIUM; THERMODYNAMICS; FLUE gases
- Publication
Angewandte Chemie, 2014, Vol 126, Issue 49, p13701
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201408369