Diffusion Coefficients
from <sup>13</sup>C PGSE NMR
MeasurementsFluorine-Free Ionic Liquids with the DCTA<sup>–</sup> Anion
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Abstract
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 <sup>1</sup>H, <sup>7</sup>Li, <sup>19</sup>F, and <sup>31</sup>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<sup>–</sup>). It is demonstrated here that <sup>13</sup>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