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1-Butyl-3-methylimidazolium hexafluorophosphate

1-Butyl-3-methylimidazolium hexafluorophosphate, also known as BMIM-PF6, is a viscous, colourless, hydrophobic and non-water-soluble ionic liquid with a melting point of −8 °C. Together with 1-butyl-3-methylimidazolium tetrafluoroborate, BMIM-BF4, it is one of the most widely studied ionic liquids. It is known to very slowly decompose in the presence of water.

Preparation and uses

BMIM-PF6 is commercially available. It may be obtained in two steps: BMIM-Cl is synthesized by alkylating 1-methylimidazole with 1-chlorobutane. A metathesis reaction with potassium hexafluorophosphate gives the desired compound; the tetrafluoroborate may be prepared by analogously using potassium tetrafluoroborate.

:[[File:BMIM.png|350px]]

BMIM-PF6 has been investigated in electrochemistry where it serves both as solvent and electrolyte, and in electrochemical CO2 reduction.

References

References

  1. Mihkel Koel. (2008). "Ionic Liquids in Chemical Analysis". CRC Press.
  2. (2003). "Ionic liquids are not always green: hydrolysis of 1-butyl-3-methylimidazolium hexafluorophosphate". [[Green Chem.]].
  3. (2004). "Preparation of 1-Butyl-3-methyl imidazolium-based Room Temperature Ionic Liquids".
  4. Álvaro Pérez-Salado Kamps, Dirk Tuma, Jianzhong Xia, Gerd Maurer. (2003). "Solubility of CO2 in the Ionic Liquid [bmim] [PF6]". Journal of Chemical & Engineering Data.
  5. Yeonji Oh, Xile Hu. (2015). "Ionic liquids enhance the electrochemical CO2 reduction catalyzed by MoO2". Chemical Communications.
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hexafluorophosphates imidazolium-compounds ionic-liquids
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