Thermodynamics Research Center / ThermoML | Thermochimica Acta

Self-aggregation of ionic liquid 1-butyl-2,3-dimethylimidazolium tetrafluoroborate [C4mmim][BF4] in aqueous media: A conductometric, volumetric and spectroscopic study

Pal, A.[Amalendu], Pillania, A.[Ankita]
Thermochim. Acta 2014, 597, 41-47
ABSTRACT
Aggregation behaviour of ionic liquid (IL), 1-butyl-2,3-dimethylimidazolium tetrafluoroborate, [C4mmim][BF4] in aqueous media has been studied by electrical conductivity, density and speed of sound measurements across temperature range (288.15 308.15) K. The critical aggregation concentration (cac), the standard Gibb s free energy of aggregation, DG agg, adiabatic compressibility, bS and changes in the adiabatic compressibility upon aggregation, DbS,agg for the IL in aqueous solution have been derived from the experimental data. Further to get the deeper insights into the aggregation process spectroscopic study using 1H NMR measurements have been carried out. The aggregation behaviour observed from conductance and volumetric approaches has been found to be in good agreement with each other. NMR study revealed the formation of loosely bound ion associates as aggregates in the system upon aggregation.
Compounds
# Formula Name
1 C9H17BF4N2 1-butyl-2,3-dimethylimidazolium tetrafluoroborate
2 H2O water
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 2
  • 1
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Molality, mol/kg - 1; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 33
  • POMD
  • 2
  • 1
  • Speed of sound, m/s ; Liquid
  • Temperature, K; Liquid
  • Molality, mol/kg - 1; Liquid
  • Pressure, kPa; Liquid
  • Frequency, MHz; Liquid
  • Liquid
  • Sing-around technique in a fixed-path interferometer
  • 33
  • POMD
  • 2
  • 1
  • Electrical conductivity, S/m ; Liquid
  • Temperature, K; Liquid
  • Molality, mol/kg - 1; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Alternating current cell with electrodes
  • 118