Laboratory of Applied Environmental Chemistry, Department of Environmental Science, University of Eastern Finland, Patteristonkatu 1, 50100 Mikkeli, Finland.
Talanta. 2011 Jan 15;83(3):907-15. doi: 10.1016/j.talanta.2010.10.062. Epub 2010 Nov 4.
A conventional ion mobility spectrometry (IMS) was used to study atmospheric pressure evaporation of seven pure imidazolium and pyrrolidinium ionic liquids (ILs) with [Tf(2)N], [PF(6)], [BF(4)] and [fap] anions. The positive drift time spectra of the as-received samples measured at 220°C exhibited close similarity; the peak at reduced mobility K(0)=1.99 cm(2)V(-1)s(-1) was a dominant spectral pattern of imidazolium-based ILs. With an assumption that ILs vapor consists mainly of neutral ion pairs, which generate the parent cations in the reactant section of the detector, and using the reference data on the electrical mobility of ILs cations and clusters, this peak was attributed to the parent cation [emim]. Despite visible change in color of the majority of ILs after the heating at 220°C for 5h, essential distinctions between spectra of the as-received and heated samples were not observed. In negative mode, pronounced peaks were registered only for ILs with [fap] anion.
采用传统的离子迁移谱（IMS）研究了七种纯咪唑鎓和吡咯烷鎓离子液体（ILs）在[TF2N]、[PF6]、[BF4]和[fap]阴离子存在下的常压蒸发。在 220°C 下测量的原始样品的正漂移时间谱非常相似；迁移率 K（0）=1.99 cm2V-1s-1 的峰是基于咪唑鎓的 ILs 的主要光谱模式。假设 ILs 蒸气主要由中性离子对组成，这些离子对在检测器的反应物部分产生母体阳离子，并使用 ILs 阳离子和团簇的电迁移率的参考数据，将该峰归因于母体阳离子[emim]。尽管大多数 ILs 在 220°C 加热 5 小时后颜色发生明显变化，但在接收和加热样品的光谱之间未观察到明显差异。在负离子模式下，仅为具有[fap]阴离子的 ILs 记录到明显的峰。
