Mixing divalent ionic liquids: effects of charge and side-chains

Eduards Bakis, Adriaan van den Bruinhorst, Laure Pison, Ivan Palazzo, Thomas Chang, Marianne Kjellberg, Cameron C. Weber, Margarida Costa Gomes (Coresponding Author), Tom Welton (Coresponding Author)

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We have prepared novel divalent ionic liquids (ILs) based on the bis(trifluoromethylsulfonyl)imide anion where two charged imidazolium groups in the cations are either directly bound to each other or linked by a single atom. We assessed the influence of the side-chain functionality and divalency on their physical properties and on the thermodynamics of mixing. The results indicate that shortening the spacer of a divalent IL reduces its thermal stability and increases its viscosity. Mixtures of divalent and monovalent ILs show small but significant deviations from ideality upon mixing. These deviations appear to depend primarily on the (mis)match of the nature and length of the cation side-chain. The non-ideality imposed by mixing ILs with different side-chains appears to be enhanced by the increase in formal charge of the cations in the mixture.

Original languageEnglish
Pages (from-to)4624-4635
Number of pages12
JournalPhysical Chemistry Chemical Physics
Issue number8
Publication statusPublished - 28 Feb 2021
Externally publishedYes

Field of Science*

  • 1.3 Physical sciences

Publication Type*

  • 1.1. Scientific article indexed in Web of Science and/or Scopus database


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