| 19309104 |
Katsyuba SA, Griaznova TP, Vidis A, Dyson PJ: Structural studies of the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate in dichloromethane using a combined DFT-NMR spectroscopic approach. J Phys Chem B. 2009 Apr 16;113(15):5046-51.
DFT methods in combination with NMR spectroscopy are used to investigate possible variants of the molecular structure of the ion pairs of the ionic liquid (IL) 1-ethyl-3-methylimidazolium tetrafluoroborate, [EMIM][BF (4)], in dichloromethane. According to the computations of the chemical shifts, experimental NMR spectra can be rationalized by an equilibrium between ca. 70-80% of structures with the anion positioned near to the C2 atom of the imidazolium ring and ca. 20-30% of structures with the anion close to the C5 and/or C4 atoms. The content of the latter structures, according to the computed Gibbs free energies, does not exceed 10%. Both the computations and the experimental NMR data suggest that the ratio of the two above-mentioned types of structures of the imidazolium-based ILs is influenced by the concentration/polarity of their dichloromethane solutions. |
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