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Solvation properties of protic ionic liquid-molecular solvent mixtures
Dilek Yalcin1, Andrew J Christofferson, Calum J Drummond
1School of Science, College of Science, Engineering and Health, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia. tamar.greaves@rmit.edu.au.
Physical Chemistry Chemical Physics : PCCP
|May 6, 2020
Summary
Mixing protic ionic liquids (PILs) with molecular solvents enhances solvation capabilities. This study explored 66 binary solvent mixtures, revealing complex interactions and preferential solvation beyond ideal behavior for improved applications.
Area of Science:
- Physical Chemistry
- Materials Science
Background:
- Ionic liquids (ILs) offer unique properties but can be costly or viscous.
- Protic ionic liquids (PILs) and binary mixtures with molecular solvents present cost-effective and tunable alternatives.
- Understanding solvent-solute interactions in these mixtures is crucial for optimizing applications.
Purpose of the Study:
- To investigate the solvation properties of binary mixtures of PILs with molecular solvents.
- To analyze specific and non-specific interactions influencing solvation behavior.
- To determine if these mixtures offer enhanced solvation capabilities compared to individual components.
Main Methods:
- Spectroscopic measurements using four solvatochromic probe molecules across 66 binary solvent mixtures (PILs: EAN, PAN; solvents: water, methanol, acetonitrile, DMSO).
- Fourier-transform infrared (FTIR) spectroscopy analysis of all mixtures without probes.
- Molecular dynamics simulations to study dye-solvent interactions in water-EAN systems.
Main Results:
- Solvation parameters deviated significantly from ideal behavior in binary mixtures.
- Preferential solvation was observed, indicating non-uniform composition within solvation shells, dependent on the solute.
- Complex interplay of specific and non-specific interactions governs solvation properties.
Conclusions:
- Binary mixtures of PILs and molecular solvents exhibit non-ideal solvation behavior.
- Preferential solvation effects are significant and solute-dependent.
- These tailored solvent systems can substantially enhance overall solvation capability for various applications.
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