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In situ Synchrotron IR Microspectroscopy of CO2 Adsorption on Single Crystals of the Functionalized MOF Sc2(BDC-NH2)3

DOI: 10.1002/anie.201408369 DOI Help
PMID: 25382542 PMID Help

Authors: Alex Greenaway (EaStCHEM School of Chemistry, Purdie Building, St Andrews) , Berenice Gonzalez-santiago (EaStCHEM School of Chemistry, Purdie Building, St Andrews) , Paul Donaldson (Diamond Light Source) , Mark Frogley (Diamond Light Source) , Gianfelice Cinque (Diamond Light Source) , Jorge Sotelo (EaStCHEM School of Chemistry, Joseph Black Building, West Mains Road, Edinburgh) , Stephen Moggach (The University of Edinburgh) , Elenica Shiko (University of Edinburgh) , Stefano Brandani (University of Edinburgh) , Russell Howe (University of Aberdeen) , Paul Wright (University of St Andrews)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Angewandte Chemie International Edition , VOL 53 (49) , PAGES 13483 - 13487

State: Published (Approved)
Published: December 2014
Diamond Proposal Number(s): 9027 , 8875 , 10014

Open Access Open Access

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, Sc-2(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.

Journal Keywords: Analytical Methods; Carbon Dioxide Adsorption; Ir Spectroscopy; Metal–Organic Frameworks; Single Crystals

Subject Areas: Chemistry

Instruments: B22-Multimode InfraRed imaging And Microspectroscopy , I11-High Resolution Powder Diffraction

Added On: 09/02/2016 16:40

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