Bester-Rogac, Marija and Hunger, Johannes and Stoppa, Alexander and Buchner, Richard (2011) 1-Ethyl-3-methylimidazolium Ethylsulfate in Water, Acetonitrile, and Dichloromethane: Molar Conductivities and Association Constants. JOURNAL OF CHEMICAL AND ENGINEERING DATA, 56 (4). pp. 1261-1267. ISSN 0021-9568,
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Molar conductivities, Lambda, of dilute solutions of the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate in water, acetonitrile (AN), and dichloromethane (DCM) were determined as a function of temperature (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 concentration range c = (approximate to 0.25 to approximate to 5).10(-3) mol.dm(-3). The data were analyzed with Barthel's low-concentration chemical (lcCM) model to obtain the limiting molar conductivities, Lambda(infinity)(T), and association constants, K-A(circle)(T), of this electrolyte in the investigated solvents. From Lambda(infinity)(T) the Eyring activation enthalpy of charge transport was determined 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 (K-A(circle) approximate to 6.10(4) mol(-1).dm(3)), whereas ion association in AN is rather weak (K-A(circle) approximate to 40 mol(-1).dm(3)). From the temperature dependence of K-A(circle)(T) the enthalpy and entropy of the ion-pairing process were calculated, and ion association was found to be entropy-driven for both nonaqueous solvents. In water the salt is fully dissociated.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TEMPERATURE IONIC LIQUIDS; ELECTRICAL-CONDUCTIVITY; AQUEOUS-SOLUTIONS; PAIR FORMATION; MIXTURES; CONDUCTANCE; CATALYSIS; VISCOSITY; SOLVENTS; CHLORIDE; |
| 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: | 23 Jun 2020 05:44 |
| Last Modified: | 23 Jun 2020 05:44 |
| URI: | https://pred.uni-regensburg.de/id/eprint/21036 |
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