1-Butyl-3-methylimidazolium hexafluorophosphate, also known as BMIM-PF₆, is a viscous, colourless, hydrophobic and non-water soluble ionic liquid. Together with 1-butyl-3-methylimidazolium tetrafluoroborate, BMIM-BF₄, it is one of the most widely studied ionic liquids and is commercially available from most of the major international suppliers of chemicals. It is known to very slowly decompose in the presence of water.^[1]

Preparation

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.^[2]

Solubility

• Soluble: 1-butyl-3-methylimidazolium tetrafluoroborate, ...
• Non-soluble: diethyl ether, water

References

1. ↑
2. ↑

Further reading

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