Thermodynamics Research Center / ThermoML | Thermochimica Acta

Probing molecular interactions of ionic liquid in industrially important solvents by means of conductometric and spectroscopic approach

Roy, M. N.[Mahendra Nath], Dewan, R.[Rajani], Ekka, D.[Deepak], Banik, I.[Ishani]
Thermochim. Acta 2013, 559, 46-51
ABSTRACT
Qualitative and quantitative analysis of molecular interaction prevailing in ionic liquid-organic solvent media, probed by electrical conductances and FT-IR measurements have been reported. Conductometric studies of 1-ethyl-3-methylimidazolium bromide [EMIm]Br in acetonitrile (AN), methanol (MeOH), N,N-dimethyl formamide (DMF), N,N-dimethyl acetamide (DMA) and dimethyl sulphoxide (DMSO) at 298.15 K reveals high molecular interaction contributed mainly by ion dipole interaction as evident from the FT-IR measurements. The extent of interaction is expressed in terms of the association constant (KA) and shows the ion dipole interaction to be a function of viscosity. The interaction obtained is highest in case of DMSO in comparison to the other solvents. The greater share of the conductance of [EMIm]Br in different solvents comes from the Br- ion than the [EMIm]+ ion as evident from their ionic conductance values which is estimated from the appropriate division of the limiting molar conductivity value of tetrabutylammonium tetraphenylborate [Bu4NBPh4] as the reference electrolyte method.
Compounds
# Formula Name
1 C6H11BrN2 1-ethyl-3-methylimidazolium bromide
2 C2H3N acetonitrile
3 CH4O methanol
4 C3H7NO dimethylformamide
5 C4H9NO N,N-dimethylethanamide
6 C2H6OS dimethyl sulfoxide
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
  • Molar conductivity, S*m2/mol ; Liquid
  • Amount concentration (molarity), mol/dm3 - 1; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Alternating current cell with electrodes
  • 15
  • POMD
  • 3
  • 1
  • Molar conductivity, S*m2/mol ; Liquid
  • Amount concentration (molarity), mol/dm3 - 1; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Alternating current cell with electrodes
  • 15
  • POMD
  • 4
  • 1
  • Molar conductivity, S*m2/mol ; Liquid
  • Amount concentration (molarity), mol/dm3 - 1; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Alternating current cell with electrodes
  • 15
  • POMD
  • 5
  • 1
  • Molar conductivity, S*m2/mol ; Liquid
  • Amount concentration (molarity), mol/dm3 - 1; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Alternating current cell with electrodes
  • 15
  • POMD
  • 6
  • 1
  • Molar conductivity, S*m2/mol ; Liquid
  • Amount concentration (molarity), mol/dm3 - 1; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Alternating current cell with electrodes
  • 15