Nazet, Andreas and Buchner, Richard (2018) Dielectric response and transport properties of alkylammonium formate ionic liquids. JOURNAL OF CHEMICAL PHYSICS, 148 (19): 193836. ISSN 0021-9606, 1089-7690
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Dielectric relaxation spectra of three members of the alkylammonium formate family of protic ionic liquids (PILs), namely, ethylammonium formate (EAF), n-butylammonium formate (BuAF), and n-pentylammonium formate (PeAF), as well as the pseudo-PIL triethylamine + formic acid (molar ratio 1:2; TEAF) have been studied over a wide frequency (50 MHz to 89 GHz) and temperature range (5-65 degrees C), complemented by measurements of their density, viscosity, and conductivity. It turned out that the dominating relaxation of EAF, BuAF, and PeAF arises from both cation and anion reorientations which are synchronized in their dynamics due to hydrogen bonding. Amplitudes and relaxation times of this mode reflect the-compared to nitrate-different nature of H bonding between the formate anion and ethylammonium cation, as well as increasing segregation of the PIL structure into polar and non-polar domains. The TEAF data suggest that its dominating relaxation is due to the rotation of the complex triethylamine.(formic acid)(2) in which no significant proton transfer to an ion pair occurred. Weak dissociation of this complex into ions was postulated to account for the high conductivity of TEAF. Published by AIP Publishing.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PROPIONIC ACID-TRIETHYLAMINE; PHYSICOCHEMICAL PROPERTIES; RELAXATION SPECTROSCOPY; MOLECULAR-INTERACTIONS; ELECTROLYTE-SOLUTIONS; PHYSICAL-PROPERTIES; CARBOXYLIC-ACIDS; PROTON-TRANSFER; HYDROGEN-BOND; CHAIN-LENGTH; |
| 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) Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 09 Mar 2020 13:17 |
| Last Modified: | 09 Mar 2020 13:17 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14567 |
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