Diffusion coefficients, spin-lattice relaxation times, and chemical shift variations of NMR spectra in LiTFSI-doped ether- and allyl-functionalized dicationic ionic liquids

A review of NMR methods used in the study of the structure and dynamics of ionic liquids

“…However, 7 Li + NMR chemical shifts remain unchanged with the increase in the concentration of LiTFSA in DEMETFSA suggesting that the solvation structure around the Li + cation is similar throughout the studied concentration range . The 1 H and 19 F NMR chemical shifts have been reported to increase with the increase in temperature of the LiTFSI mixtures of 3,3′‐(2,2′‐oxybis(ethane‐2,1‐diyl)) bis(1‐allyl‐imidazolium) bis(trifluoromethylsulfonyl)amide ([AIOIA][TFSI]) . This downfield shift is because of the decrease in the electron density around the 1 H and 19 F nuclei of [AIOIA][TFSI].…”

“…This downfield shift is because of the decrease in the electron density around the 1 H and 19 F nuclei of [AIOIA][TFSI]. Contrastingly, an upfield shift in the 1 H and 19 F NMR spectrum has been observed with the increase in the concentration of LiTFSI in [AIOIA][TFSI] because of the formation of cluster‐like structure in the mixtures …”

“…A decreasing trend in correlation time has been observed with increasing water indicating a faster rotational motion of lithium ion . 1 H (C2 proton) and 19 F NMR T 1 relaxation studies have been carried out in order to understand the effect of LiTFSA on the [AIOIA][TFSA] …”

“…In another report, the LiTFSI mixtures of a series of quaternary ammonium ILs have been studied and found that in spite of the low ionic radii of Li + cation, its self‐diffusion coefficients are smaller as compared with the ammonium and TFSI ions suggesting the possible formation of [Li(TFSI) n+1 ] n− species inside the solution . The self‐diffusion of an ether and allyl‐functionalized dicationic IL ([AIOIA][TFSI]) and its LiTFSI doped salt has been studied with the variation of Li + salts and temperature of the medium . The activation energy of self‐diffusion of cation and anion of [AIOIA][TFSI] has been calculated that are observed to be higher than the activation energy of σ andΛ in all the composition of Li + salts.…”

Impact of polyethyleneglycol addition on diffusion coefficients in binary ionic liquid electrolytes composed of dicationic ionic liquid and polyethyleneglycol

“…The molar conductivity ( Λ NMR ) can be calculated from the measured PGSE‐NMR self‐diffusion coefficients of IMCI + , IMOI + , and TFSI − by using the following Nernst–Einstein equation:…”