Diffusion measurements to understand dynamics and structuring in solutions involving a homologous series of ionic liquids

Daniel C. Morris, Adrian R. Morris, William S. Price, Stuart W. Prescott, Jason B. Harper

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1 Citation (Scopus)

Abstract

The self-diffusion coefficients of each of the components in mixtures containing pyridine and each of the homologous series 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imides in acetonitrile were determined using NMR diffusometry (i. e., Pulsed Gradient Spin Echo). The nature of solvation was found to change significantly with the proportion of salt in the mixtures. Increased diffusion coefficients (when corrected for viscosity) for the molecular components were observed with increasing proportion of ionic liquid and with increasing alkyl chain length on the cation. Comparison of the molecular solvents suggests increased interactions in solution of the pyridine with other components of the mixture, consistent with the proposed interactions shown previously to drive changes in reaction kinetics. Discontinuities were seen in the diffusion data for each species in solution across different ionic liquids between the hexyl and octyl derivatives, suggesting a change in the structuring in solution as the alkyl chain on the cation changes and demonstrating the importance of such when considering homologous series.
Original languageEnglish
Article numbere202300015
Number of pages9
JournalChemPhysChem
Volume24
Issue number11
Publication statusPublished - 1 Jun 2023

Bibliographical note

Publisher Copyright:
© 2023 The Authors. ChemPhysChem published by Wiley-VCH GmbH.

Open Access - Access Right Statement

© 2023 The Authors. ChemPhysChem published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution Non-Commercial NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

Notes

WIP in RD

Keywords

  • diffusion coefficients
  • ionic liquids
  • microscopic interactions
  • solution structure

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