Abstract
A distinguished class of hydrophobic ionic liquids bearing a Br<TEX>${\o}$</TEX>nsted acidic character derived from amide-like compounds were prepared by a neutralization reaction of N,N-diethylformamide, N,N-dibutylformamide, 1-formylpiperidine, and <TEX>$\varepsilon$</TEX>-caprolactam with trifluoroacetic acid and physical absorptions of <TEX>$CO_2$</TEX> in these ionic liquids were demonstrated and evaluated. <TEX>$CO_2$</TEX> solubilities in these ionic liquids were influenced by the molecular structure of the cation and were apparently increased with the molar volume. Comparison based on a volume unit reveals that <TEX>$CO_2$</TEX> solubilities in these liquids are relatively higher than those in imidazolium-based ionic liquids. Henry's coefficients calculated from low-pressure solubility tests at 313 to 333 K were used to derive the thermodynamics quantities. Enthalpy and entropy of solvation may share equal contributions in solubility.
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