Marekha, Bogdan A. and Kalugin, Oleg N. and Bria, Marc and Buchner, Richard and Idrissi, Abdenacer (2014) Translational Diffusion in Mixtures of Imidazolium ILs with Polar Aprotic Molecular Solvents. JOURNAL OF PHYSICAL CHEMISTRY B, 118 (20). pp. 5509-5517. ISSN 1520-6106,
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Self-diffusion coefficients of cations and solvent molecules were determined with H-1 NMR in mixtures of 1-n-butyl-3-methylimidazolium (Bmim(+)) tetrafluoroborate (BF4-), hexafluorophosphate (PF6-), trifluoromethanesulfonate (TfO-), and bis(trifluoromethylsulfonyl)imide (TFSI-) with acetonitrile (AN), gamma-butyrolactone (gamma-BL), and propylene carbonate (PC) over the entire composition range at 300 K. The relative diffusivities of solvent molecules to cations as a function of concentration were found to depend on the solvent but not on the anion (i.e., IL). In all cases the values exhibit a plateau at low IL content (x(IL) < 0.2) and then increase steeply (AN), moderately (gamma-BL), or negligibly (PC) at higher IL concentrations. This behavior was related to the different solvation patterns in the employed solvents. In BmimPF(6)-based systems, anionic diffusivities were followed via P-31 nuclei and found to be higher than the corresponding cation values in IL-poor systems and lower in the IL-rich region. The inversion point of relative ionic diffusivities was found around equimolar composition and does not depend on the solvent. At this point, a distinct change in the ion-diffusion mechanism appears to take place.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TEMPERATURE IONIC LIQUIDS; POLYMER GEL ELECTROLYTE; SELF-DIFFUSION; PROPYLENE CARBONATE; 1-BUTYL-3-METHYLIMIDAZOLIUM HEXAFLUOROPHOSPHATE; ORGANIC-SOLVENTS; PHYSICOCHEMICAL PROPERTIES; TRANSPORT-PROPERTIES; TRIMETHYL-SULFONIUM; GAMMA-BUTYROLACTONE; |
| 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: | 06 Nov 2019 14:32 |
| Last Modified: | 06 Nov 2019 14:32 |
| URI: | https://pred.uni-regensburg.de/id/eprint/10164 |
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