用 NMR 弛豫法研究一组基于咪唑鎓的离子液体 [bmim]A 中的分子迁移率。
Molecular Mobility in a Set of Imidazolium-Based Ionic Liquids [bmim]A by the NMR-Relaxation Method.
机构信息
Saint Petersburg State University , University Embankment, 7/9 , 199034 Saint-Petersburg , Russia.
Vilnius University , 3 Universiteto Street , LT-01513 Vilnius , Lithuania.
出版信息
J Phys Chem B. 2019 Mar 14;123(10):2362-2372. doi: 10.1021/acs.jpcb.8b11250. Epub 2019 Mar 5.
The detailed investigation of the local mobility in a set of dried imidazolium-based ionic liquids (1-butyl-3-methylimidazolium) in a wide temperature range and varying anions (BF, I, Cl, Br, NO, TfO) is presented. The measurements of temperature dependencies of the spin-lattice relaxation times of H and C nuclei are motivated by the need to obtain a fundamental characterization of molecular mobility of the substances under study, namely, to estimate the correlation times, τ, for the motion of individual molecular groups. In particular, it follows from obtained results that the mobility of the hydrocarbon "tail" is higher (smaller τ) than that of the imidazole ring, and this expected tendency is quantified. The effect of the influence of an anion type on the cation mobility is also analyzed.
本文详细研究了一系列干燥的咪唑基离子液体（1-丁基-3-甲基咪唑）在较宽温度范围和不同阴离子（BF、I、Cl、Br、NO、TfO）下的局部迁移。测量 H 和 C 核自旋晶格弛豫时间的温度依赖性是为了获得所研究物质分子迁移的基本特征，即估计单个分子基团运动的相关时间τ。特别是，结果表明，碳氢“尾”的迁移率更高（τ更小），而咪唑环的迁移率则较低，这一预期趋势被量化了。还分析了阴离子类型对阳离子迁移率的影响。
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