Sonnleitner, Thomas and Turton, David A. and Hefter, Glenn and Ortner, Alexander and Waselikowski, Stefan and Walther, Markus and Wynne, Klaas and Buchner, Richard (2015) Ultra-Broadband Dielectric and Optical Kerr-Effect Study of the Ionic Liquids Ethyl and Propylammonium Nitrate. JOURNAL OF PHYSICAL CHEMISTRY B, 119 (29). pp. 8826-8841. ISSN 1520-6106,
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Dielectric relaxation (DR) and optical Kerr-effect (OKE) spectra of the archetypal protic ionic liquids ethyl- and propylammonium nitrate (EAN and PAN) have been measured over an unusually large frequency range from 200 MHz to 10 THz at temperatures (mostly) between 5 and 65 degrees C. Analysis of the low-frequency alpha-relaxation, associated with the cooperative relaxations of the cations (DR) and anions (OKE) and any clusters present, indicated that ion reorientation in EAN is decoupled from viscosity and occurs via cooperative relaxation involving large-angle jumps rather than rotational diffusion. Detailed consideration of the high-frequency parts of the DR and OKE spectra showed that the observed intensities were a complex combination of overlapping and possibly coupled modes. In addition to previously identified intermolecular H-bond vibrations, there are significant contributions from the librations of the cations and anions. The present assignments were shown to be consistent with the isotopic shifts observed for deuterated EAN.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ETHYLAMMONIUM NITRATE; ELECTROLYTE-SOLUTIONS; ROOM-TEMPERATURE; RAMAN-SCATTERING; RELAXATION SPECTROSCOPY; SUPERCOOLED LIQUIDS; PHYSICAL-PROPERTIES; MOLECULAR-DYNAMICS; MOBILE PHASES; ORGANIC SALTS; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 Jul 2019 12:33 |
| Last Modified: | 05 Jul 2019 12:33 |
| URI: | https://pred.uni-regensburg.de/id/eprint/5185 |
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