Umecky Tatsuya, Saito Yuria, Matsumoto Hajime
J Phys Chem B. 2009 Jun 25;113(25):8466-8. doi: 10.1021/jp9043946.
Ionic mobilities of the ionic liquids, 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)amide,1-ethyl-3-methylimidazolium fluorosulfonyl-(trifluoromethylsulfonyl)amide, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) -amide, were measured using the electric field applying pulsed gradient spin-echo NMR technique. Observed mobilities were more than 1 order of magnitude greater than the values estimated from the diffusion coefficients measured under the equilibrium state without the electric field. Electric field dependence of the ionic mobility showed that the high mobility appeared above the threshold of the field strength with keeping the constant values. This indicates that the ions are orientated by the application of the electric field may be due to the dielectric polarization.
使用施加电场的脉冲梯度自旋回波核磁共振技术测量了离子液体1-乙基-3-甲基咪唑四氟硼酸盐、1-乙基-3-甲基咪唑双（氟磺酰基）酰胺、1-乙基-3-甲基咪唑氟磺酰基-（三氟甲基磺酰基）酰胺、1-乙基-3-甲基咪唑双（三氟甲基磺酰基）酰胺、1-丁基-3-甲基咪唑双（三氟甲基磺酰基）酰胺的离子迁移率。观察到的迁移率比在无电场平衡状态下测量的扩散系数估计值大1个多数量级。离子迁移率的电场依赖性表明，在保持恒定值的情况下，高迁移率出现在场强阈值以上。这表明施加电场使离子取向可能是由于介电极化。
