Typical anions in ionic liquids include the following: tetrafluoroborate (BF), hexafluorophosphate (PF), bis-trifluoromethanesulfonimide (NTf), trifluoromethanesulfonate (OTf), dicyanamide (N(CN)), hydrogen sulphate (HSO), and ethyl sulphate (EtOSO). Magnetic ionic liquids can be synthesized by incorporating paramagnetic anions, illustrated by 1-butyl-3-methylimidazolium tetrachloroferrate.