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Structure-property relationships in protic ionic liquids: a study of solvent-solvent and solvent-solute Interactions

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  • Joshua Elias Samuel James Reid
  • Carlos E S Bernardes
  • Filipe Agapito
  • Filomena Martins
  • Seishi Shimizu
  • Manuel E Minas da Piedade
  • Adam Walker


Publication details

JournalPhysical Chemistry Chemical Physics
DateIn preparation - 2017
DateSubmitted - 27 Jul 2017
DateAccepted/In press - 2 Oct 2017
DateE-pub ahead of print - 12 Oct 2017
DatePublished (current) - 7 Nov 2017
Issue number41
Number of pages6
Pages (from-to)28133-28138
Early online date12/10/17
Original languageEnglish


The ionic nature of a functionalized protic ionic liquid cannot be rationalized simply through the differences in aqueous proton dissociation constants between the acid precursor and the conjugate acid of the base precursor. The extent of proton transfer, i.e. the equilibrium ionicity, of a tertiary ammonium acetate protic ionic liquid can be significantly increased by introducing an hydroxyl functional group on the cation, compared to the alkyl or amino-functionalized analogues. This increase in apparent ionic nature correlates well with variations in solvent-solute and solvent-solvent interaction parameters, as well as with physicochemical properties such as viscosity.

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