A1 Refereed original research article in a scientific journal
Molecular mobility of counterion functional groups in ionic liquid 1-ethyl-3-methylimidazolium acetate according to 1H and 13C NMR relaxation data
Authors: V V Matveev, D A Markelov, V I Chizhik, P Ingman, E Lähderanta
Publisher: Internal Edition, Springer
Publishing place: NEW YORK; 233 SPRING ST, NEW YORK, NY 10013 USA
Publication year: 2013
Journal: Russian Chemical Bulletin
Journal name in source: Russian Chemical Bulletin
Journal acronym: Russ.Chem.Bull.
Number in series: 9
Volume: 62
Issue: 9
First page : 1985
Last page: 1990
Number of pages: 6
ISSN: 1066-5285
DOI: https://doi.org/10.1007/s11172-013-0288-6
Abstract
1-Ethyl-3-methylimidazolium acetate was studied by NMR relaxation. The temperature dependences of the spin-lattice relaxation rates (1/T (1)) for H-1 and C-13 were obtained. The curves with maxima were observed for the majority of the temperature dependences 1/T (1), which provided a reliable temperature dependence of the correlation times (tau(c)). In the low-temperature range, the proton relaxation rates tend to an asymptotic value, which is related, most likely, to spin diffusion manifested in the studied samples. The values of correlation times tau(c) calculated for H-1 and C-13 of the same functional group almost coincide at high temperatures, which confirms that the used approach is adequate for the determination of characteristic times of rotational reorientation of counterions in the studied ionic liquid.
1-Ethyl-3-methylimidazolium acetate was studied by NMR relaxation. The temperature dependences of the spin-lattice relaxation rates (1/T (1)) for H-1 and C-13 were obtained. The curves with maxima were observed for the majority of the temperature dependences 1/T (1), which provided a reliable temperature dependence of the correlation times (tau(c)). In the low-temperature range, the proton relaxation rates tend to an asymptotic value, which is related, most likely, to spin diffusion manifested in the studied samples. The values of correlation times tau(c) calculated for H-1 and C-13 of the same functional group almost coincide at high temperatures, which confirms that the used approach is adequate for the determination of characteristic times of rotational reorientation of counterions in the studied ionic liquid.
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