根据氢核磁共振和碳核磁共振弛豫数据得出的几种咪唑基离子液体中的分子迁移率
Molecular mobility in several imidazolium-based ionic liquids according to data of H and C NMR relaxation.
作者信息
Matveev Vladimir V, Markelov Denis A, Ievlev Alexandr V, Brui Ekaterina A, Tyutyukin Konstantin V, Lähderanta Erkki
机构信息
Physical Faculty, Saint Petersburg State University, 7/9 Universitetskaya nab, Saint Petersburg, 199034, Russia.
Laboratory of Physics, Lappeenranta University of Technology, Box 20, 53851, Lappeenranta, Finland.
出版信息
Magn Reson Chem. 2018 Feb;56(2):140-143. doi: 10.1002/mrc.4681. Epub 2017 Dec 3.
Temperature dependences are compared for H and C NMR 1/T curves relaxation rates in three imidazolium-based ionic liquids (ILs), namely, in [bmim]PF , [bmim]BF , and [emim]CH COO. C curves show alike behavior for all three ILs and follow a well-known Bloembergen-Pound-Purcell (BPP) equation. On the contrary, an essential part of H curves differ strongly from corresponding C ones and also have different shapes for different ILs. For the first time, we have detected the specific, two-maximum shape of H relaxation curve for hydrogen atom of C(2)H group of the [emim]CH COO. Assuming that this maximum reflects the correlated rotation of several adjoining ion pairs, we have tried to destroy this rotation by addition of glycerol to the [emim]CH COO. The second, high-temperature maximum has disappeared in the [emim]CH COO-glycerol mixture, and this fact confirms our assumption. Copyright © 2017 John Wiley & Sons, Ltd.
比较了三种咪唑基离子液体（ILs），即[bmim]PF、[bmim]BF和[emim]CH₃COO中¹H和¹³C NMR 1/T曲线弛豫率的温度依赖性。¹³C曲线显示这三种离子液体具有相似的行为，并遵循著名的布洛姆伯根-庞德-珀塞尔（BPP）方程。相反，¹H曲线的重要部分与相应的¹³C曲线有很大差异，并且不同离子液体的¹H曲线形状也不同。我们首次检测到[emim]CH₃COO中C(2)H基团氢原子的¹H弛豫曲线具有特定的双最大值形状。假设这个最大值反映了几个相邻离子对的相关旋转，我们试图通过向[emim]CH₃COO中添加甘油来破坏这种旋转。在[emim]CH₃COO-甘油混合物中，第二个高温最大值消失了，这一事实证实了我们的假设。版权所有© 2017约翰威立父子有限公司。
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