Lithium solvation and diffusion in the 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ionic liquid

被引：161

作者：

Duluard, Sandrine ^{[2
]}

Grondin, Joseph ^{[1
]}

Bruneel, Jean-Luc ^{[1
]}

Pianet, Isabelle ^{[1
]}

Grelard, Axelle ^{[3
]}

Campet, Guy ^{[2
]}

Delville, Marie-Helene ^{[2
]}

Lassegues, Jean-Claude ^{[1
]}

机构：

[1] Univ Bordeaux 1, CNRS, UMR 5255, ISM, F-33405 Talence, France

[2] Univ Bordeaux 1, CNRS, ICMCB, F-33608 Pessac, France

[3] IECB, F-33607 Pessac, France

来源：

JOURNAL OF RAMAN SPECTROSCOPY | 2008年 / 39卷 / 05期

关键词：

diffusion coefficients; lithium transference number; ionic liquid; 1-butyl-3-methylimidazolium; bis(trifluoromethanesulfonyl)imide;

D O I：

10.1002/jrs.1896

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

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 H-1, F-19, and Li-7 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 (C) 2008 John Wiley & Sons, Ltd.

引用

页码：627 / 632

页数：6

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