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

Tzi Yi Wu*, Shyh Gang Su, Yi Hsuan Wang, Yuan Chung Lin, Jeng-Kuei Chang, Chung Wen Kuo, I. Wen Sun

*此作品的通信作者

研究成果: Article同行評審

22 引文 斯高帕斯(Scopus)

摘要

An ether- and allyl-functionalized dicationic ionic liquid ([AIOIA][TFSI]) is prepared and the effects of the addition of lithium bis(trifluoromethanesulfonyl)imide into [AIOIA][TFSI] on hydrogen, fluorine, and lithium diffusion coefficients, spin-lattice relaxation times, and chemical shift of one-dimensional (1D) nuclear magnetic resonance (NMR) spectroscopy are studied. NMR longitudinal relaxation relation time measurements (400 MHz) show that the 1 H-T 1 and 19 F-T 1 values of neat [AIOIA][TFSI] and LiTFSI-doped [AIOIA][TFSI] increase with increasing temperature and decrease with increasing LiTFSI concentration. The chemical shift variations in 1D NMR spectroscopy show an upfield shift in 1 H and 19 F spectra with increasing lithium salt concentration in LiTFSI-doped [AIOIA][TFSI]. A tendency of cluster-like structural formation is the dominant effect when LiTFSI is added to [AIOIA][TFSI]. The Li ion transference number increases with increasing temperature and increasing LiTFSI mole fraction in LiTFSI-doped [AIOIA][TFSI]. The high t Li with high lithium salt concentration can compensate for the slower lithium transport caused by high viscosity.

原文English
頁(從 - 到)138-150
頁數13
期刊Journal of the Taiwan Institute of Chemical Engineers
60
DOIs
出版狀態Published - 1 3月 2016

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