Wobbling and Hopping: Studying Dynamics of CO2 Adsorbed in Metal-Organic Frameworks via (17)O Solid-State NMR.
Knowledge of adsorbed gas dynamics within microporous solids is crucial for the design of more efficient gas capture materials. We demonstrate that (17)O solid-state NMR (SSNMR) experiments allow one to obtain accurate information on CO2 dynamics within metal-organic frameworks (MOFs), using CPO-27-M (M = Mg, Zn) as examples. Variable-temperature (VT) (17)O SSNMR spectra acquired from 150 to 403 K yield key parameters defining the CO2 motions. VT (17)O SSNMR spectra of CPO-27-Zn indicate relatively weaker metal-oxygen binding and increased CO2 dynamics. (17)O SSNMR is a sensitive probe of CO2 dynamics due to the presence of both the quadrupolar and chemical shielding interactions, and holds potential for the investigation of motions within a variety of microporous materials.
†Department of Chemistry, The University of Western Ontario, London, Ontario Canada, N6A 5B7.|‡State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, Gansu China, 730000.
Wei David
WD
Wang
†Department of Chemistry, The University of Western Ontario, London, Ontario Canada, N6A 5B7.
Bryan E G
BE
Lucier
§Department of Chemistry, University of Ottawa, Ottawa, Ontario Canada, K1N 6N5.
Victor V
VV
Terskikh
‡State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, Gansu China, 730000.
Wei
W
Wang
†Department of Chemistry, The University of Western Ontario, London, Ontario Canada, N6A 5B7.
Yining
Y
Huang
13C NMR; 17O NMR; carbon dioxide; gas adsorption; metal−organic frameworks; microporous materials; solid-state NMR