TY - JOUR
T1 - A comparative study of ionic conductivity, translational diffusion, molecular motion, and physicochemical properties in lithium bis(trifluoromethanesulfonyl)imide-doped 1-methyl-3-pentyl- and 1,2-dimethyl-3-pentyl-substituted imidazolium-based ionic liquids
AU - Lin, Yi Jan
AU - Hao, Lin
AU - Lin, Yuan Chung
AU - Kuo, Chung Wen
AU - Chen, Pin Rong
AU - Wu, Tzi Yi
AU - Sun, I. Wen
PY - 2013/6/1
Y1 - 2013/6/1
N2 - The ionic conductivity, translational diffusion, molecular motion, and physicochemical properties of ionic liquids (ILs) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)-doped ILs with two different imidazolium cations (1-methyl-3-pentylimidazolium [MPI]+ and 1,2-dimethyl-3-pentyl-imidazolium [DMPI]+) are characterized. Self-diffusion coefficients D for the anion and the cation are measured by pulsed field gradient spin echo NMR (PGSE-NMR), the measured ion diffusion coefficients, viscosities, and ionic conductivity follow the Vogel-Tammann-Fulcher (VTF) equation for the temperature dependencies, and the best-fit parameters are determined. LiTFSI-doped [MPI][TFSI] shows a NOE signal between Li+ and MPI+ and a broad Li peak was observed in HOESY spectra, whereas there is no NOE signal in LiTFSI-doped [DMPI][TFSI], demonstrating that one additional methyl group at the C-2 position in the DMPI+ may prevent Li+ to be closed to DMPI+ via steric hindrance.
AB - The ionic conductivity, translational diffusion, molecular motion, and physicochemical properties of ionic liquids (ILs) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)-doped ILs with two different imidazolium cations (1-methyl-3-pentylimidazolium [MPI]+ and 1,2-dimethyl-3-pentyl-imidazolium [DMPI]+) are characterized. Self-diffusion coefficients D for the anion and the cation are measured by pulsed field gradient spin echo NMR (PGSE-NMR), the measured ion diffusion coefficients, viscosities, and ionic conductivity follow the Vogel-Tammann-Fulcher (VTF) equation for the temperature dependencies, and the best-fit parameters are determined. LiTFSI-doped [MPI][TFSI] shows a NOE signal between Li+ and MPI+ and a broad Li peak was observed in HOESY spectra, whereas there is no NOE signal in LiTFSI-doped [DMPI][TFSI], demonstrating that one additional methyl group at the C-2 position in the DMPI+ may prevent Li+ to be closed to DMPI+ via steric hindrance.
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M3 - Article
AN - SCOPUS:84879039775
VL - 8
SP - 8097
EP - 8114
JO - International Journal of Electrochemical Science
JF - International Journal of Electrochemical Science
SN - 1452-3981
IS - 6
ER -