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Ammonium Ionic Liquid Solubilities in Water and Micellar Formation
Rachaud Keyes1, Paul Scovazzo1
1Department of Chemical Engineering, University of Mississippi , 134 Anderson Hall, University, Mississippi 38677, United States.
The Journal of Physical Chemistry. B
|July 6, 2017
Summary
Ionic liquids with bis(trifluoromethanesulfonyl)imide anions show limited water solubility and minimal micelle formation. Linear free energy models predict solubility based on cation structure and molecular volume.
Area of Science:
- Physical Chemistry
- Materials Science
Background:
- Ionic liquids (ILs) are crucial for applications involving IL/water interfaces, such as chemical separations and drug delivery.
- Understanding IL solubility and micellar behavior in aqueous environments is essential for these applications.
- The bis(trifluoromethanesulfonyl)imide (Tf2N) anion promotes water stability, forming water-immiscible ILs.
Purpose of the Study:
- To investigate the water solubility and micellar behavior of Tf2N-based ILs with different cation structures.
- To correlate IL water solubility with molecular volume and cation structure using linear free energy relationship (LFER) models.
- To determine the significance of micelle formation in IL-saturated water.
Main Methods:
- Total organic carbon (TOC) analysis to quantify IL content in saturated aqueous solutions.
- Surface tension measurements to detect micelle formation.
- Linear free energy relationship (LFER) semiempirical models to correlate solubility with molecular properties.
Main Results:
- ILs containing the Tf2N anion exhibited limited water solubility.
- Surface tension measurements indicated that micelle formation was not significant for tested ILs (molecular weights ≤510).
- Developed LFER models accurately predict IL water solubility based on cation structure and molecular volume.
Conclusions:
- The water solubility of Tf2N-based ILs is predictable using LFER models, aiding in material design.
- Micelle formation is negligible for the studied ILs in aqueous solutions.
- This research provides critical data for designing ILs for interfacial applications.
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