Diffusion Coefficients from 13C PGSE NMR Measurements鈥擣luorine-Free Ionic Liquids with the DCTA鈥?/sup> Anion

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• 作者：Cristelle Herriot ; Sufia Khatun ; Eric T. Fox ; Patrick Judeinstein ; Michel Armand ; Wesley A. Henderson ; Steve Greenbaum
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2012
• 出版时间：February 2, 2012
• 年：2012
• 卷：3
• 期：3
• 页码：441-444
• 全文大小：221K
• 年卷期：v.3,no.3(February 2, 2012)
• ISSN：1948-7185

文摘

Pulsed-field gradient spin鈥揺cho (PGSE) NMR is a widely used method for the determination of molecular and ionic self-diffusion coefficients. The analysis has thus far been limited largely to ¹H, ⁷Li, ¹⁹F, and ³¹P nuclei. This limitation handicaps the analysis of materials without these nuclei or for which these nuclei are insufficient for complete characterization. This is demonstrated with a class of ionic liquids (or ILs) based on the nonfluorinated anion 4,5-dicarbonitrile-1,2,3-triazole (DCTA鈥?/sup>). It is demonstrated here that ¹³C-PGSE NMR can be used to both verify the diffusion coefficients obtained from other nuclei, as well as characterize materials that lack commonly scrutinized nuclei 鈥?all without the need for specialized NMR methods.

Keywords:

pulsed-field gradient spin鈭抏cho; PGSE; diffusion coefficient; ionic liquid; DCTA