AUTHOR=Gyabeng Derick , Martin Pierre-Alexandre , Pal Urbi , Deschamps Michaël , Forsyth Maria , O'Dell Luke A. 

TITLE=Investigating Intermolecular Interactions in a DME-Based Hybrid Ionic Liquid Electrolyte by HOESY NMR

JOURNAL=Frontiers in Chemistry

VOLUME=7

YEAR=2019

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00004

DOI=10.3389/fchem.2019.00004

ISSN=2296-2646

ABSTRACT=<p>The intermolecular interactions in a hybrid electrolyte based on various compositions of the ionic liquid <italic>N</italic>-methyl-<italic>N</italic>-propyl pyrrolidinium bis-fluorosulfonylimide (C<sub>3</sub>mpyrFSI), LiFSI salt and an ether-based additive, 1,2-dimethoxy ethane (DME), have been investigated using the HOESY (Heteronuclear Overhauser Effect SpectroscopY) NMR experiment. This NMR technique allows a quantification of the intermolecular interactions in ionic liquids (ILs) by measuring the cross-relaxation rate (σ) between different pairs of nuclei. Thereby, we compare the cross-relaxation rates between the cations, anions and DME in these hybrid electrolyte systems using <sup>1</sup>H-<sup>7</sup>Li and <sup>1</sup>H-<sup>19</sup>F HOESY experiments, and interpret the measured parameters in terms of ionic and molecular associations. The results give insights into the local coordination environment of the Li<sup>+</sup> cations and their solvation by the FSI anions and DME.</p>