Bester-Rogac, Marija and Stoppa, Alexander and Hunger, Johannes 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. ISSN 1463-9076,
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Ion association of the ionic liquid [bmim][Cl] in acetonitrile and in water was studied by dielectric spectroscopy for salt concentrations c <= 1.3 M at 298.15 K and by measurement of molar electrical conductivities, L, of dilute solutions (c <= 0.006 M) in the temperature range 273.15 <= T/K <= 313.15. Whilst acetonitrile solutions of [bmim][Cl] exhibit moderate ion pairing, with an association constant of K(A)(o) approximate to 60 M(-1) and increasing with temperature, [bmim][Cl] is only weakly associated in water (K(A)(o) approximate to 6 M(-1)) and ion pairing decreases with rising temperature. Only contact ion pairs were detected in both solvents. Standard-state enthalpy, entropy and heat capacity changes of ion association were derived, as well as the activation enthalpy of charge transport and the limiting conductivity of the cation,lambda(infinity) ([bmim](+)). These data, in conjunction with effective solvation numbers obtained from the dielectric spectra, suggest that the solvation of [bmim]+ is much weaker in water than in acetonitrile.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | AQUEOUS-ELECTROLYTE-SOLUTIONS; ELECTRICAL-CONDUCTIVITY; RELAXATION SPECTROSCOPY; TEMPERATURE-DEPENDENCE; MOLECULAR-SOLVENTS; PAIR FORMATION; MIXTURES; DYNAMICS; CONDUCTANCE; COEFFICIENTS; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 Jul 2020 06:15 |
| Last Modified: | 02 Jul 2020 06:15 |
| URI: | https://pred.uni-regensburg.de/id/eprint/21666 |
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