Nazet, Andreas and Weiss, Lisa and Buchner, Richard (2017) Dielectric relaxation of nitromethane and its mixtures with ethylammonium nitrate: Evidence for strong ion association induced by hydrogen bonding. JOURNAL OF MOLECULAR LIQUIDS, 228. pp. 81-90. ISSN 0167-7322, 1873-3166
Full text not available from this repository. (Request a copy)Abstract
Binary mixtures of the aprotic protophobic solvent nitromethane (NM) and the protic room-temperature ionic liquid ethylammonium nitrate (EAN) were studied with dielectric relaxation spectroscopy in the two single-phase regions, 0 < chi(EAN) <= 0.013 and 0.4 <= chi(EAN) < 1, of the binary mixtures at 25 degrees C. All spectra were well described by a superposition of two relaxation processes whose origins were of composite nature. At low chi(EAN) the solutions behave as a strongly associated electrolyte, displaying moderate ion solvation by nitromethane at the infinite-dilution limit. At high chi(EAN) far from the miscibility gap, the observed dynamics represents the typically observed behaviour of a lubricated ionic liquid smoothly reaching the properties of pure EAN. Additionally, neat NM was investigated in the temperature range of 5 to 65 degrees C to explore its potential as a calibration standard in dielectric spectroscopy. The obtained 0.05 to 89 GHz spectra were well fitted by a single Debye equation. The dynamics of this medium-permittivity dipolar liquid is governed by rotational diffusion of NM dipoles close to slip boundary conditions with only weak dipole-dipole correlations. Unfortunately, difficulties in obtaining samples of reproducible purity discredit NM as a calibration standard for dielectric measurements. (C) 2016 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PLUS ACETONITRILE MIXTURES; ELECTROLYTE-SOLUTIONS; LIQUID NITROMETHANE; AQUEOUS-SOLUTIONS; DYNAMICS; SPECTROSCOPY; SOLVENTS; SYSTEM; WATER; SOLVATION; Dielectric relaxation; Dipolar liquids; Protic ionic liquids; Ion solvation; Hydrogen bonding; Ion association |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie 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: | 14 Dec 2018 13:01 |
| Last Modified: | 15 Feb 2019 11:01 |
| URI: | https://pred.uni-regensburg.de/id/eprint/478 |
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