Lithium solvation and diffusion in the 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ionic liquid
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en
Article de revue
Este ítem está publicado en
Journal of Raman Spectroscopy. 2008, vol. 39, n° 5, p. 627-632
Wiley
Resumen en inglés
The Raman spectra of (1 - x)(BMITFSI), xLiTFSI ionic liquids, where 1-butyl-3-methylimidazolium cation (BMI+) and bis(trifluoromethane-sulfonyl)imide anion (TFSI-) are analyzed for LiTFSI mole fractions x < 0.4. As expected ...Leer más >
The Raman spectra of (1 - x)(BMITFSI), xLiTFSI ionic liquids, where 1-butyl-3-methylimidazolium cation (BMI+) and bis(trifluoromethane-sulfonyl)imide anion (TFSI-) are analyzed for LiTFSI mole fractions x < 0.4. As expected from previous studies on similar TFSI-based systems, most lithium ions are shown to be coordinated within [Li(TFSI)2]- anionic clusters. The variation of the self-diffusion coefficients of the 1H, 19F, and 7Li nuclei, measured by pulsed-gradient spin-echo NMR (PGSE-NMR) as a function of x, can be rationalized in terms of the weighted contribution of BMI+ cations, TFSI- free anions, and [Li(TFSI)2]- anionic clusters. This implies a negative transference number for lithium.< Leer menos
Palabras clave en inglés
Diffusion coefficients
Lithium transference number
Ionic liquid
1-butyl-3-methylimidazolium
Bis(trifluoromethanesulfonyl)imide
Orígen
Importado de HalCentros de investigación