Gyabeng Derick, Martin Pierre-Alexandre, Pal Urbi, Deschamps Michaël, Forsyth Maria, O'Dell Luke A
Institute for Frontier Materials, Deakin University, Geelong, VIC, Australia.
CEMHTI, CNRS UPR 3079, Orléans University, Orléans, France.
Front Chem. 2019 Jan 29;7:4. doi: 10.3389/fchem.2019.00004. eCollection 2019.
The intermolecular interactions in a hybrid electrolyte based on various compositions of the ionic liquid -methyl--propyl pyrrolidinium bis-fluorosulfonylimide (CmpyrFSI), 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 H-Li and H-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 cations and their solvation by the FSI anions and DME.
利用异核Overhauser效应光谱（HOESY）核磁共振实验，研究了基于离子液体 - 甲基 - 丙基吡咯烷双（氟磺酰）亚胺（CmpyrFSI）、LiFSI盐和醚基添加剂1,2 - 二甲氧基乙烷（DME）的各种组成的混合电解质中的分子间相互作用。这种核磁共振技术通过测量不同核对之间的交叉弛豫率（σ）来量化离子液体（ILs）中的分子间相互作用。因此，我们使用H-Li和H-F HOESY实验比较了这些混合电解质体系中阳离子、阴离子和DME之间的交叉弛豫率，并根据离子和分子缔合来解释测量参数。结果深入了解了Li阳离子的局部配位环境及其被FSI阴离子和DME溶剂化的情况。
