Ionic liquids in polyethylene glycol aqueous solutions: salting-in and salting-out effects

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Abstract

Changes of the fluid phase behaviour of polyethylene glycol (PEG) aqueous solutions - viz. critical solution temperature shifts at atmospheric pressure - were produced by the addition of different ionic liquids, namely 1-ethyl-3-methylimidazolium ethyl sulfate and 1-alkyl-3-methylimidazolium chloride (alkyl = ethyl to decyl). The addition of ionic liquids with long alkyl chains improves the solubility of PEG in water (salting-in effect), whereas the impact of short-chain ionic liquids is usually the contrary (salting-out effect). The results are interpreted taking into account the kosmotropic (water-structuring) or chaotropic (water-structure-breaking) nature of ionic liquids, as compared to other inorganic salts.

Original languageEnglish
Pages (from-to)1153-1157
Number of pages5
JournalMonatshefte fur Chemie
Volume138
Issue number11
DOIs
Publication statusPublished - 1 Nov 2007

Keywords

  • Aqueous PEG solutions
  • Ionic Liquids
  • Kosmotropic and chaotropic salts
  • Salting-out effects

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