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Dynamics of Ionic Liquids

Ionic liquids (ILs) are salts that are liquids at or near room temperature. ILs have some characteristic properties as solvent, such as extremely low vapor pressure and flammability, large electrochemical window, high temperature stability, unique solubility and so on. ILs have been proposed as novel reaction media or electrolyte.

Our research group is collaborated with Dr. M. Imanari and Associate Prof. H. Seki at Chemical Analysis Center of Chiba University, and has carried out NMR measurements (especially relaxation times) to reveal dynamics of ILs.

Reorientational dynamics of a molecule is estimated from longitudinal relaxation time (T1) of NMR. We measure T1 for not only liquid states but also crystalline states using some NMR instruments with different magnetic field.

M. Imanari, K. Uchida, K. Miyano, H. Seki and K. Nishikawa, Phys. Chem. Chem. Phys., 2010, 12, 2959-2967

Fig. 1 Temperature dependence of 13C NMR spectra of [C3mim]Br. At lower temperature the peaks of rigid carbons disappeared, while those of flexible carbons were still observed.

Fig. 2 Correlation times for the carbons of [C3mim]Br estimated from T1 measurements. Each carbon has different correlation time.

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