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

Salari, H ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1007/s10953-013-0079-6
  3. Publisher: 2013
  4. Abstract:
  5. 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; ET N, normalized polarity parameter) in different binary mixtures of ionic liquid with molecular solvents were determined with UV-Vis spectroscopy. The ET N parameters show nearly ideal trends in all solvent mixtures, but the other parameters show different behavior in the mixtures. The πparameters 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 πparameters 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
  6. Keywords:
  7. Binary mixtures ; Ionic liquids ; Preferential solvation model ; Solvatochromic parameters ; Solvent-solvent interactions
  8. Source: Journal of Solution Chemistry ; Volume 42, Issue 9 , 2013 , Pages 1757-1769 ; 00959782 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs10953-013-0079-6