Molecular-Microscopic Properties and Preferential Solvation in Protic Ionic Liquid Mixtures |
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Authors: | Hadi Salari Seyedsaeid Ahmadvand Ali Reza Harifi-Mood Mohsen Padervand Mohammad Reza Gholami |
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Institution: | 1. Department of Chemistry, Sharif University of Technology, Azadi Ave, P.O. Box 11365-9516, Tehran, Iran 2. Department of Chemistry, Tarbiat Moallem University, Mofatteh Ave, P.O. Box 15719-14911, Tehran, Iran
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Abstract: | Structural and molecular-microscopic properties of the solvatochromic probes 4-nitroaniline, 4-nitroanisole, and Reichardt’s dye were investigated in binary mixtures of ethylammonium propionate with methanol, ethanol, 1-propanol and 2-propanol. Solvatochromic parameters (α, hydrogen-bond donor acidity; β, hydrogen-bond acceptor basicity; π*, dipolarity/polarizability; $ E_{\text{T}}^{\text{N}} $ , normalized polarity parameter) in different binary mixtures of ionic liquid with molecular solvents were determined with UV–Vis spectroscopy. The $ E_{\text{T}}^{\text{N}} $ parameters show nearly ideal trends in all solvent mixtures, but the other parameters show different behavior in the mixtures. The π* parameters show a negative deviation from ideality in the ionic liquid/methanol system. In contrast, the α parameters have severe positive deviations from ideal behavior in ionic liquid/1-propanol and ionic liquid/2-propanol solvent mixtures. A synergistic solvation effect is observed for the π* parameters in IL/methanol mixtures. Specific solute–solvent interactions or solvent–solvent interactions, which cause non-ideal trends in some parameters, are justified and interpreted by the preferential solvation model. |
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