Thermal Properties of Alkyl-triethylammonium bis{(trifluoromethyl)sulfonyl}imide Ionic Liquids

Karolina Machanová, Zdeněk Wagner, Adéla Andresová, Jan Rotrekl, Aurélien Boisset, Johan Jacquemin, Magdalena Bendová

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


In this work, we address the thermal properties of selected members of a
homologous series of alkyltriethylammonium bisf(trifluoromethyl)sulfonylgimide ionic
liquids. Their phase and glass transition behavior, as well as their standard isobaric heat
capacities at 298.15 K, were studied using differential scanning calorimetry (DSC),
whereas their decomposition temperature was determined by thermal gravimetry analysis.
DSC was further used to measure standard molar heat capacities of the studied ionic liquids
and standard molar heat capacity as a function of temperature for hexyltriethylammonium,
octyltriethylammonium, and dodecyltriethylammonium bisf(trifluoromethyl)sulfonylgimide
ionic liquids. Based on the data obtained, we discuss the influence of the alkyl chain
length of the cation on the studied ionic liquids on the measured properties. Using viscosity
data obtained in a previous work, the liquid fragility of the ionic liquids is then discussed.
Viscosity data were correlated by the VTF equation using a robust regression along a
gnostic influence function. In this way, more reliable VTF model parameters were obtained than in our previous work and a good estimate of the liquid fragility of the ionic liquids was made.
Original languageEnglish
Pages (from-to)790-810
Number of pages21
JournalJournal of Solution Chemistry
Issue number3-4
Early online date11 Apr 2015
Publication statusPublished - Apr 2015


  • Ionic liquids
  • Thermal properties
  • Phase transitions
  • Heat capacity
  • Fragility
  • Mathematical gnostics


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