Bester-Rogac, M. and Stoppa, A. and Hunger, J. and Hefter, Glenn and Buchner, Richard (2011) Association of ionic liquids in solution: a combined dielectric and conductivity study of [bmim][Cl] in water and in acetonitrile. Physical Chemistry Chemical Physics 13 (39), pp. 17588-17598.
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The ion assocn. in solns. of 1-N-butyl-3-N-methylimidazolium chloride ([bmim][Cl]) in acetonitrile and in water was studied by dielec. spectroscopy for salt concns. c ≤ 1.3 M at 298.15 K and by measurement of molar elec. conductivities, Λ, of dil. solns. (c ≤ 0.006 M) in the temp. range 273.15 .ltorsim. T/K ≤ 313.15. While acetonitrile solns. of [bmim][Cl] exhibit moderate ion pairing, with an assocn. const. of KA0 ≈ 60 M-1 and increasing with temp., [bmim][Cl] is only weakly assocd. in water (KA0 ≈ 6 M-1) and ion pairing decreases with rising temp. Only contact ion pairs were detected in both solvents. Std.-state enthalpy, entropy and heat capacity changes of ion assocn. were derived, as well as the activation enthalpy of charge transport and the limiting cond. of the cation, λ∞ ([bmim]+). These data, in conjunction with effective solvation nos. obtained from the dielec. spectra, suggest that the solvation of [bmim]+ is much weaker in water than in acetonitrile.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||ion pair soln butylmethyimidazolium chloride acetonitrile water dielec spectroscopy elec cond ion pair soln butylmethyimidazolium chloride acetonitrile water|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||05 Jun 2012 11:41|
|Last Modified:||02 Jul 2012 14:18|