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NMR Diffusion Measurements as a Simple Method to Examine Solvent¿Solvent and Solvent¿Solute Interactions in Mixtures of the Ionic Liquid [Bmim][N(SO2CF3)2] and Acetonitrile

Journal Article


Abstract


  • The self-diffusion coefficients of each component in mixtures of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([Bmim][N(SO2CF3)2]) and acetonitrile were determined. The results suggest that the hydrodynamic boundary conditions change from “stick” to “slip” as the solvent composition transitions from “ionic liquid dissolved in acetonitrile” (χIL<0.4) to “acetonitrile dissolved in ionic liquid” (χIL>0.4). At higher χIL, the acetonitrile species are affected by “cage” and “jump” events, as the acetonitrile molecules reside nearer to the charged centre on the ions than in the “non-polar” regions. The self-diffusion coefficients of hexan-1-amine, dipropylamine, 1-hexanol and dipropylether in mixtures of [Bmim][N(SO2CF3)2] and acetonitrile were determined. In general, the nitrogen-containing solutes were found to diffuse slower than the oxygen-containing solutes; this indicates that there are greater ionic liquid–N interactions than ionic liquid–O interactions. This work demonstrates that the self-diffusion coefficients of species can provide valuable information about solvent–solvent and solvent–solute interactions in mixtures containing an ionic liquid.

Publication Date


  • 2016

Citation


  • Keaveney, S. T., Schaffarczyk McHale, K. S., Stranger, J. W., Ganbold, B., Price, W. S., & Harper, J. B. (2016). NMR Diffusion Measurements as a Simple Method to Examine Solvent¿Solvent and Solvent¿Solute Interactions in Mixtures of the Ionic Liquid [Bmim][N(SO2CF3)2] and Acetonitrile. ChemPhysChem, 17(23), 3853-3862. doi:10.1002/cphc.201600927

Scopus Eid


  • 2-s2.0-84995793058

Start Page


  • 3853

End Page


  • 3862

Volume


  • 17

Issue


  • 23

Abstract


  • The self-diffusion coefficients of each component in mixtures of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([Bmim][N(SO2CF3)2]) and acetonitrile were determined. The results suggest that the hydrodynamic boundary conditions change from “stick” to “slip” as the solvent composition transitions from “ionic liquid dissolved in acetonitrile” (χIL<0.4) to “acetonitrile dissolved in ionic liquid” (χIL>0.4). At higher χIL, the acetonitrile species are affected by “cage” and “jump” events, as the acetonitrile molecules reside nearer to the charged centre on the ions than in the “non-polar” regions. The self-diffusion coefficients of hexan-1-amine, dipropylamine, 1-hexanol and dipropylether in mixtures of [Bmim][N(SO2CF3)2] and acetonitrile were determined. In general, the nitrogen-containing solutes were found to diffuse slower than the oxygen-containing solutes; this indicates that there are greater ionic liquid–N interactions than ionic liquid–O interactions. This work demonstrates that the self-diffusion coefficients of species can provide valuable information about solvent–solvent and solvent–solute interactions in mixtures containing an ionic liquid.

Publication Date


  • 2016

Citation


  • Keaveney, S. T., Schaffarczyk McHale, K. S., Stranger, J. W., Ganbold, B., Price, W. S., & Harper, J. B. (2016). NMR Diffusion Measurements as a Simple Method to Examine Solvent¿Solvent and Solvent¿Solute Interactions in Mixtures of the Ionic Liquid [Bmim][N(SO2CF3)2] and Acetonitrile. ChemPhysChem, 17(23), 3853-3862. doi:10.1002/cphc.201600927

Scopus Eid


  • 2-s2.0-84995793058

Start Page


  • 3853

End Page


  • 3862

Volume


  • 17

Issue


  • 23