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Lithium solvation and diffusion in the 1‐butyl‐3‐methylimidazolium bis(trifluoromethanesulfonyl)imide ionic liquid
Author(s) -
Duluard Sandrine,
Grondin Joseph,
Bruneel JeanLuc,
Pianet Isabelle,
Grélard Axelle,
Campet Guy,
Delville MarieHélène,
Lassègues JeanClaude
Publication year - 2008
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1896
Subject(s) - ionic liquid , imide , chemistry , solvation , lithium (medication) , ion , raman spectroscopy , sulfonyl , diffusion , ionic bonding , inorganic chemistry , organic chemistry , thermodynamics , medicine , physics , alkyl , optics , endocrinology , catalysis
The Raman spectra of (1 − x )(BMITFSI), x LiTFSI 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 1 H, 19 F, and 7 Li 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. Copyright © 2008 John Wiley & Sons, Ltd.