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Solvent Effect on the Enthalpy of Solution and Partial Molar Volume of the Ionic Liquid 1-Butyl-3-methylimidazolium Tetrafluoroborate

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Abstract

Enthalpies of solution and partial molar volumes of the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate were determined in 15 solvents of different polarity. Very large differences of the enthalpies of solution (ΔΔsol H IL=38.9 kJ⋅mol−1) and partial molar volumes (ΔV IL=43 cm3⋅mol−1) are nearly the same as observed for lithium perchlorate solutions. These results clearly indicate that the low values of the macroscopic polarity parameters of [bmim]BF4 do not correspond with the large differences of the intermolecular interactions in IL solutions. The values of the partial molar volume of the cation, \(V_{[\mathrm{bmim}]^{+}}\), were estimated for the first time. The changes of the partial molar volumes, V IL, reflect mainly the changes of anion volume, \(V_{\mathrm{BF}_{4}^{-}}\). The rate of the Diels–Alder reaction of 9,10-dimethylanthracene with maleic anhydride in the [bmim]BF4 medium was nearly the same as in common molecular solvents.

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Acknowledgements

This work was supported by the US Civilian Research and Development Foundation (CRDF), and the Ministry of Science and Education of the Russian Federation (Joint Program “Fundamental Research and High Education”, Grant REC-007), by the Russian Federal Agency of Education (No. P-2345, GK No. 14.740.11.0377, GK No. OK-1/2010), and the Russian Fund for Basic Researches (grant No. 12-03-00029). We also appreciate fruitful comments from the reviewers, which helped for us in finalizing this manuscript.

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  1. Department of Physical Chemistry, Butlerov Institute of Chemistry, Kazan Federal University, Kremlevskaya Str. 18, Kazan, 420008, Russian Federation

    Vladimir D. Kiselev, Helena A. Kashaeva, Ilzida I. Shakirova, Lubov’ N. Potapova & Alexander I. Konovalov

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  1. Vladimir D. Kiselev
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  2. Helena A. Kashaeva
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  3. Ilzida I. Shakirova
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  4. Lubov’ N. Potapova
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  5. Alexander I. Konovalov
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Correspondence to Vladimir D. Kiselev.

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Kiselev, V.D., Kashaeva, H.A., Shakirova, I.I. et al. Solvent Effect on the Enthalpy of Solution and Partial Molar Volume of the Ionic Liquid 1-Butyl-3-methylimidazolium Tetrafluoroborate. J Solution Chem 41, 1375–1387 (2012). https://doi.org/10.1007/s10953-012-9881-9

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