1-Butyl-3-methylimidazolium tetrachloroferrate

1-Butyl-3-methylimidazolium tetrachloroferrate is a magnetic ionic liquid. It can be obtained from 1-butyl-3-methylimidazolium chloride and ferric chloride. It has quite low water solubility.^[1][2]

1-Butyl-3-methylimidazolium tetrachloroferrate

Identifiers
CAS Number	359845-21-9
3D model (JSmol)	Interactive image
ECHA InfoCard	100.203.250
PubChem CID	11674455
CompTox Dashboard (EPA)	DTXSID0049282
SMILES CCCCN1C=C[N+](=C1)C.Cl[Fe-](Cl)(Cl)Cl
Properties
Chemical formula	C8H15Cl4FeN2
Molar mass	336.87 g·mol^−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Due to the presence of the high spin FeCl₄ anion, the liquid is paramagnetic and a magnetic susceptibility of 40.6 × 10⁻⁶ emu g⁻¹ is reported. A simple small neodymium magnet suffices to attract the liquid in a test tube.

References

1. Satoshi Hayashi; Hiro-o Hamaguchi (2004). "Discovery of a Magnetic Ionic Liquid [bmim]FeCl₄". Chemistry Letters. 33 (18): 1590–1591. doi:10.1246/cl.2004.1590.
2. Satoshi Hayashi; Satyen Saha; Hiro-o Hamaguchi (2006). "A new class of magnetic fluids: bmim[FeCl₄] and nbmim[FeCl₄] ionic liquids". IEEE Transactions on Magnetics. 42 (1): 12–14. Bibcode:2006ITM....42...12H. doi:10.1109/TMAG.2005.854875. S2CID 42347833.