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Understanding Carbon Dioxide Solubility in Ionic Liquids by Exploring the Link with Liquid Clathrate Formation
Author(s) -
Kelley Steven P.,
Flores Luis A.,
Shan Matthew S.,
Bara Jason E.,
Rogers Robin D.
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201703117
Subject(s) - solubility , clathrate hydrate , ionic liquid , dicyanamide , dissolution , chemistry , benzene , ion , molecule , molar volume , solvent , inorganic chemistry , organic chemistry , hydrate , thermodynamics , physics , catalysis
The solubilities of the quadrupolar molecules benzene and CO 2 in various ionic liquids (ILs) are compared in order to determine the connection between aromatic liquid clathrate formation and CO 2 dissolution in ILs. It was found that both CO 2 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 CO 2 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 CO 2 .