Diffusion Coefficients from (13)C PGSE NMR Measurements-Fluorine-Free Ionic Liquids with the DCTA(-) Anion.
Pulsed-field gradient spin-echo (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 (1)H, (7)Li, (19)F, and (31)P 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(-)). It is demonstrated here that (13)C-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 - all without the need for specialized NMR methods.
Cristelle
C
Herriot
Sufia
S
Khatun
Eric T
ET
Fox
§Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Sud, UMR CNRS 8182, Bâtiment 410, 91405 Orsay Cedex, France.
Patrick
P
Judeinstein
∥Laboratoire de Réactivité et de Chimie des Solides, Université de Picardie Jules Verne, 33 Rue Saint-Leu, F-80039 Amiens Cedex, France.
Michel
M
Armand
Wesley A
WA
Henderson
Steve
S
Greenbaum
DCTA; PGSE; diffusion coefficient; ionic liquid; pulsed-field gradient spin−echo