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Local Structure in Mixtures of Ionic Liquid with Molecular Solvent: Vibration Spectroscopy, NMR and Molecular Dynamics Simulation

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Molecular Basics of Liquids and Liquid-Based Materials

Part of the book series: Physical Chemistry in Action ((PCIA))

Abstract

Ionic liquids (IL), being low-temperature melts by their nature, are of considerable scientific interest due to a number of their unique properties. The practical application of ILs, especially in electrochemistry, has significantly expanded due to the use of mixtures with molecular solvents of various natures. A detailed microscopic description of the local structure in such systems, depending on the nature of its constituent components and the composition of the mixture, remains an urgent problem of modern chemistry of liquid state. In this chapter, we review the results obtained by vibration spectroscopy and NMR chemical shift on the variations in microscopic structure as a function of mixture composition. We point out the controversy about the assignment of the imidazolium C–H stretching vibration mode and systemized its red shift as associated with the outcome of the competition of the solvent molecules and the anions for the C–H bond. Furthermore, the introduction of the double difference relative chemical shift helps us to compare and rationalize the 1H chemical shift literature data obtained in various ionic liquid/solvent mixtures. The most significant changes in the 1H chemical shift occur at low ionic liquid content. Dilution and stacking interactions between the cation rings induce a negative variation of the 1H relative chemical shift. As the solvent and the ions can establish hydrogen bond interactions, when these interactions are weaker, almost equal or higher than the interionic interactions, this results in negative, almost equal to zero, or positive values of the relative chemical shift, respectively. Moreover, starting from the idea that the nearest neighbor anions or solvent molecules of the C–H bond are strongly influencing the associated C–H vibration mode and the 1H chemical shift, we used molecular dynamic simulation and the nearest neighbor approach to calculate radial distribution and spatial radial distribution functions, and to define two statistical distance descriptors of the hydrogen bond structure C–H… X ( X being atom of either the anion or of the solvent) to characterize the local structure around the C–H bond of the cation. The mole fraction dependence of these statistical properties, calculated by taking only the nearest neighbor into account, correlates consistently with spectroscopic data. Indeed, these descriptors are relatively unaffected in the ionic liquid mole fraction (x IL) range between 1.0 and 0.3, while with a further decrease of x IL a large effect on these descriptors is observed. These changes are compatible with the physical picture that the solvent molecules compete with the anions to occupy positions close to the cation ring hydrogen atoms. They are associated with the expected weakening of the cation–anion interactions in the chosen solvents. These results are in good agreement with the behavior of the 1H chemical shift and the C–H vibration mode as a function of x IL. Furthermore, the results of the MD simulations point out the importance of the anion—solvent interactions in weakening the interionic ones.

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Acknowledgments

The authors acknowledge financial support from the French National Agency for Research (ANR-19-CE05-0009-01 Ultrafast photoinduced processes of organic dyes in ionic liquid/molecular solvent mixtures designed for dye solar cells), the Ministries of Europe and Foreign Affairs (MEAE) and Higher Education, Research and Innovation (MESRI) and the Ministry of Education and Science of Ukraine under project Nos 42645ND (France) 0119U002532 (Ukraine), the Hungarian NKFIH Foundation (project No. 134596), and from the Hungarian French Intergovernmental Science and Technology Program (TéT, Balaton) under project Nos. 2019-2.1.11-TÉT-2019-00017 (Hungary) and 44706QK (France).

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Authors and Affiliations

  1. Max Planck Institute for Medical Research, Heidelberg, Germany

    Bogdan A. Marekha

  2. Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux (IPREM), Université de Pau et des Pays de l’Adour, Pau Cedex 9, Nouvelle Aquitaine, France

    Volodymyr Koverga

  3. Université de Lille, CNRS, UMR 8516 - LASIRe, Laboratoire Avancé de Spectroscopie pour les Interations, la Réactivité et l’Environement, Lille, France

    Nishith Maity, François A. Miannay & Abdenacer Idrissi

  4. Laboratory of Nanochemistry, Department of Biophysics Radiation Biology, Semmelweis University, Budapest, Hungary

    Akos Juhasz

  5. School of Chemistry, V. N. Karazin Kharkiv National University, Kharkiv, Ukraine

    Anton Inkol & Oleg N. Kalugin

  6. Faculty of Science and Engineering, Department of Chemistry and Applied Chemistry, Saga University, Saga, Japan

    Toshiyuki Takamuku

  7. Department of Chemistry, Eszterházy Károly University, Eger, Hungary

    Pal Jedlovszky

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  1. Bogdan A. Marekha
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  2. Volodymyr Koverga
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  6. Anton Inkol
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  7. Toshiyuki Takamuku
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  8. Pal Jedlovszky
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  9. Oleg N. Kalugin
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  10. Abdenacer Idrissi
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Corresponding author

Correspondence to Abdenacer Idrissi .

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Editors and Affiliations

  1. Meijo University, Nagoya, Japan

    Katsura Nishiyama

  2. Nagoya University, Nagoya, Japan

    Tsuyoshi Yamaguchi

  3. Saga University, Saga, Japan

    Toshiyuki Takamuku

  4. Kyushu University, Fukuoka, Japan

    Norio Yoshida

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Marekha, B.A. et al. (2021). Local Structure in Mixtures of Ionic Liquid with Molecular Solvent: Vibration Spectroscopy, NMR and Molecular Dynamics Simulation. In: Nishiyama, K., Yamaguchi, T., Takamuku, T., Yoshida, N. (eds) Molecular Basics of Liquids and Liquid-Based Materials. Physical Chemistry in Action. Springer, Singapore. https://doi.org/10.1007/978-981-16-5395-7_10

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