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Molecular-microscopic properties and preferential solvation in protic ionic liquid mixtures

Salari, H. (Hadi) ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s10953-013-0079-6
  3. Abstract:
  4. 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; ENT , normalized polarity parameter) in different binary mixtures of ionic liquid with molecular solvents were determined with UV–Vis spectroscopy. The ENT 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
  5. Keywords:
  6. Binary mixtures ; Solvatochromic parameters ; Ionic liquids ; Solvent–solvent interactions ; Preferential solvation mode
  7. Source: Journal of Solution Chemistry ; Volume 42, Issue 9 , October , 2013 , pp. 1757-1769 ; 1572-8927
  8. URL: http://link.springer.com/article/10.1007%2Fs10953-013-0079-6