Characterization of the solubilizing ability of tetraalkylammonium ionic liquids containing a pendant alkyl chain bearing a basic N,N-dimethylamino or N,N-dimethylaminoethoxy functionality

Add time:08/13/2019    Source:sciencedirect.com

Infinite dilution activity coefficients and gas-to-ionic liquid partition coefficients are reported for >40 different organic compounds dissolved in N-[2-(N′,N′-dimethylamino)ethyl]-N,N-(dimethyl)-1-propanaminium bis(trifluoromethylsufonyl)imide, N-[2-(N′,N′-dimethyl-amino)ethyl]-N,N-(dimethyl)-1-butanaminium bis(trifluoromethylsufonyl)imide, N-[2-(N′,N′-dimethylamino)ethoxyethyl]-N,N-(dimethyl)-1-propanaminium bis(trifluoromethylsufonyl)imide, and N-[2-(N′,N′-dimethylamino)ethoxyethyl]-N,N-(dimethyl)-1-butanaminium bis(trifluoromethylsufonyl)imide in the temperature range from 323.15 K to 373.15 K. Partial molar excess enthalpies and partial molar excess entropies of solution were calculated from the temperature dependence of the infinite dilution activity coefficient assuming a van't Hoff relationship. Abraham model ionic liquid-specific correlations were determined from the measured partition coefficients. The derived mathematical expressions described the observed partition coefficients to within a standard deviation of 0.14 log units (or less).

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