Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 23, Issue 57, Pages 14332-14337Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201703117
Keywords
carbon dioxide capture; host-guest systems; ionic liquids; physisorption; supramolecular chemistry
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Funding
- US Air Force Office of Scientific Research under AFOSR Award [FA9550-16-1-0521]
- Natural Sciences and Engineering Research Council of Canada [RGPIN-2016-04944]
- Canada Excellence Research Chairs Program
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The solubilities of the quadrupolar molecules benzene and CO2 in various ionic liquids (ILs) are compared in order to determine the connection between aromatic liquid clathrate formation and CO2 dissolution in ILs. It was found that both CO2 Henry's law constants and benzene solubility are remarkably well correlated with each other and with IL molar volume, suggesting both phenomena depend more on the strength of interionic interactions between the ions of an IL rather than the identity of either ion. However, IL ion-quadrupole interactions were found to have an effect for dicyanamide ([N(CN)(2)](-)), where solubility of CO2 and benzene are affected by destabilizing and stabilizing interactions with [N(CN)(2)](-), respectively. The results suggest both solubility phenomena are related to the incorporation of the solute into an IL host network. Aromatic liquid clathrate formation thus has potential as a facile experimental probe for predicting the relative ability of ILs to physisorb CO2.
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