摘  要：The growing role of ionic liquids (ILs) in industry and research urges the development of analytical methods for the reliable characterization and control of IL composition. The application of mass spectrometry (MS) to the analysis of ILs is limited by the poor tolerance of classical MS methods toward samples with high salt concentration and viscosity. Here, extractive electrospray ionization mass spectrometry (EESI-MS) was applied to directly analyze various room temperature ILs, such as 1-butyl-3-methylimidazolium hexafluorophosphate, [Bmim][PF6], 1-butyl-3-methylimidazolium tetrafluoroborate, [Bmim][BF4], and 1-butylpyridinium tetrafluoroborate, [BuPy][BF4]. EESI mass spectra of ILs diluted in methanol revealed great similarity to the mass spectra of the same samples obtained by direct infusion ESI-MS. Both cationic (C+) and anionic (A-) IL components could be detected with high sensitivity from strongly diluted samples ( 2 samples per min. EESI-MS allows direct analysis of ILs in a broad concentration range with high tolerance to chemical contamination. Reported examples suggest the potential of EESI-MS to interrogate large IL assays necessary in both fundamental physical chemistry studies and industrial applications.

2014-周亚飞、Konstantin Chingin-Analytical Methods.pdf