Zusammenfassung
Molar conductivities, Λ, of dil. solns. of the ionic liqs. (ILs) 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim][BF4]), 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]), 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]), 1-hexyl-3-methylimidazolium tetrafluoroborate ([hmim][BF4]), and 1-hexyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([hmim][NTf2]) in ...
Zusammenfassung
Molar conductivities, Λ, of dil. solns. of the ionic liqs. (ILs) 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim][BF4]), 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]), 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]), 1-hexyl-3-methylimidazolium tetrafluoroborate ([hmim][BF4]), and 1-hexyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([hmim][NTf2]) in acetonitrile (AN) were detd. as a function of temp. in the range 273.15-313.15 K. The data were analyzed with Barthel's lcCM model to obtain limiting molar conductivities, Λ∞(T), and assocn. consts., KA°(T) of these electrolytes. The temp. dependence of these parameters, as well as the extd. limiting cation conductivities, λi∞, were discussed. Addnl., dielec. spectra for [hmim][NTf2] + AN were analyzed in terms of ion assocn. and ion solvation and compared with the inference from cond. It appears that in dil. solns. the imidazolium ring of the cations is solvated by ∼6 AN mols. that are slowed by a factor of ∼8-10 compared to the bulk-solvent dynamics. Ion assocn. of imidazolium ILs to contact ion pairs is only moderate, similar to common 1:1 electrolytes in this solvent. [on SciFinder(R)]
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