The Opposite Effect of Water and N-Methyl-2-Pyrrolidone Cosolvents on the Nanostructural Organization of Ethylammonium Butanoate Ionic Liquid A Small- and Wide-Angle X-Ray Scattering and Molecular Dynamics Simulations Study

Umme Salma, Natalia V. Plechkova, Ruggero Caminiti, Lorenzo Gontrani*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Two series of mixtures of ethylammoniumbutanoate (EAB, [N0 0 0 2][C3CO2]) in water and N-methyl-2-pyrrolidone (NMP) have been prepared at different molar fractions to assess the effect of these two polar solvents on the nanostructural order present in [N0 0 0 2][C3CO2]. The small- and wide-angle X-ray scattering (SWAXS) pattern of the liquid in neat state shows a prepeak at Q = 0.513 Å-1, which is associated with the aggregation of nonpolar alkyl chains of both cations and anions. Interestingly, the two solvents affect the nanostructure of [N0 0 0 2][C3CO2] differently, though both are polar. In the case of water addition to the mixture, the prepeak shifts to lower Q values, while in NMP, it moves toward higher values. Also, the principal peaks move in opposite direction in both solvents. The underlying expansion (water) or contraction (NMP) of the solutions observed by the scattering experiments is discussed in terms of molecular dynamics (MD) simulations, which are in very good agreement with the observed patterns.

Original languageEnglish
Pages (from-to)6399-6407
JournalJournal of Physical Chemistry B
Volume121
Issue number26
DOIs
Publication statusPublished - 08 Jun 2017

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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