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Molecular mobility of counterion functional groups in ionic liquid 1-ethyl-3-methylimidazolium acetate according to 1H and 13C NMR relaxation data

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Abstract

1-Ethyl-3-methylimidazolium acetate was studied by NMR relaxation. The temperature dependences of the spin-lattice relaxation rates (1/T 1) for 1H and 13C 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 (τc). 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 τc calculated for 1H and 13C 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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Authors and Affiliations

  1. Department of Physics, St. Petersburg State University, 1 ul. Ul’yanovskaya, Petrodvorets, 198504, St. Petersburg, Russian Federation

    V. V. Matveev, D. A. Markelov & V. I. Chizhik

  2. Institute of High-Molecular-Weight Compounds, Russian Academy of Sciences, 31 Bol’shoi prosp., 199004, St. Petersburg, Russian Federation

    D. A. Markelov

  3. Instrument Centre, Department of Chemistry, University of Turku, 2 Vatselankatu, FI-20014, Turku, Finland

    P. Ingman

  4. Laboratory of Physics, Lappeenranta University of Technology, Box 20, 53851, Lappeenranta, Finland

    E. Lähderanta

Authors
  1. V. V. Matveev
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  2. D. A. Markelov
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  3. V. I. Chizhik
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  4. P. Ingman
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  5. E. Lähderanta
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Correspondence to V. V. Matveev.

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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1985–1990, September, 2013.

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Matveev, V.V., Markelov, D.A., Chizhik, V.I. et al. Molecular mobility of counterion functional groups in ionic liquid 1-ethyl-3-methylimidazolium acetate according to 1H and 13C NMR relaxation data. Russ Chem Bull 62, 1985–1990 (2013). https://doi.org/10.1007/s11172-013-0288-6

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  • DOI: https://doi.org/10.1007/s11172-013-0288-6

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