| Summary: | Additional components present within an ionic liquid (IL) system have readily shown to alter the physiochemical properties and spectroscopic characteristics of the parent IL. Vibrational spectroscopy has been proven to be a powerful tool in probing these systems and identifying spectral changes as a result of the changing environment.
This work presents a range of imidazolium-based ILs that have been probed with vibrational spectroscopy. The ILs investigated possess a 1-alkyl-3-methylimidazolium cation with corresponding anions ranging from [BF4] -, [Ac] -, Cl -, [DMP] -, and [MeSO4] -. Each IL investigated was doped with an array of impurities that may commonly be retained in an IL system due to preparation and or exposure to the environment. Contamination is a common problem, leading to the perturbation of many physical and chemical properties, which can impact the overall efficiency of an IL.
Vibrational spectroscopy allows for the investigation into perturbations created by impurities and how varying concentrations ultimately affect the vibrational nature of the IL. These interactions have further been studied with the use of multivariate analysis to provide further insight into these changes. The combination of multiple vibrational spectroscopic techniques and analysis has allowed for an in-depth investigation into contaminated IL systems.
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