Bester-Rogac, M. and Hunger, J. and Stoppa, A. and Buchner, Richard (2011) 1-Ethyl-3-methylimidazolium Ethylsulfate in Water, Acetonitrile, and Dichloromethane: Molar Conductivities and Association Constants. Journal of Chemical & Engineering Data 56 (4), pp. 1261-1267.
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Molar conductivities, Λ, of dil. solns. of the ionic liq. 1-ethyl-3-methylimidazolium ethylsulfate in water, acetonitrile (AN), and dichloromethane (DCM) were detd. as a function of temp. (AN: T = (273.15 to 313.15) K; DCM: T = (273.15 to 308.15) K; water: T = (278.15 to 313.15) K) in the concn. range c = (≈ 0.25 to ≈ 5) × 10-3 mol/dm-3. The data were analyzed with Barthel's low-concn. chem. (lcCM) model to obtain the limiting molar conductivities, Λ∞(T), and assocn. consts., KA°(T), of this electrolyte in the investigated solvents. From Λ∞(T) the Eyring activation enthalpy of charge transport was detd. and found to be slightly larger than the corresponding value for viscous flow of the solvent. Strong ion pairing was found for the electrolyte in DCM (KA° ≈ 6/104 mol-1/dm3), whereas ion assocn. in AN is rather weak (KA° ≈ 40 mol-1/dm3). From the temp. dependence of KA°(T) the enthalpy and entropy of the ion-pairing process were calcd., and ion assocn. was found to be entropy-driven for both nonaq. solvents. In water the salt is fully dissocd.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||ethylmethylimidazolium ethylsulfate soln water acetonitrile dichloromethane molar cond assocn|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||06 Jun 2012 13:46|
|Last Modified:||06 Jun 2012 13:46|