Characterization of Phosphonium Ionic Liquidswith Emphasis on Mass Spectrometryand Chromatography

摘要

The majority of ionic liquid publications deal the synthesis, properties and applications of ionic liquids. This paper focuses on characterization and analysis of ionic liquids, more specifically on trace analysis. Cytec is a major producer of phosphonium ionic liquids and believes that as industrial applications and demand for ionic liquids continues to grow, so will the needs for accurate analytical methods to determine trace quantities of various ionic liquids in reactions streams as well as impurity ions in the ionic liquids. In this paper, we will address some of these issuesProduct assays usually require identification and analysis to the extent of 0.1% for various impurities-physical properties of ionic liquids are particularly sensitive to low levels of anion impurities'. In addition, toxic and carcinogenic impurities need to be determined to the ppm level or to the ppb level depending on their chemical/biological toxicity. If ILs are to be used as solvents or as catalysts, their residual amounts in the products have to be analyzed accurately.In degradation studies, UV measurement alone is not only insufficient but often also includes false positives The degradation products need to be identified and determined individually. For environmental and toxicology studies, analytical methods are often required with sub-ppm or ppb sensitivity.