Wikipedia

1-Butyl-3-methylimidazolium tetrachloroferrate

1-Butyl-3-methylimidazolium tetrachloroferrate is a magnetic ionic liquid whose appearance resembles that of honey.[2] It can be obtained from reacting 1-butyl-3-methylimidazolium chloride and ferric chloride resulting in a Lewis acid-base reaction. It has quite low water solubility.[3] It is highly polar.

1-Butyl-3-methylimidazolium tetrachloroferrate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.203.250 Edit this at Wikidata
EC Number
  • 678-175-3
  • InChI=1S/C8H15N2.4ClH.Fe/c1-3-4-5-10-7-6-9(2)8-10;;;;;/h6-8H,3-5H2,1-2H3;4*1H;/q+1;;;;;+3/p-4
    Key: FYHLFBVHUIJIII-UHFFFAOYSA-J
  • CCCCN1C=C[N+](=C1)C.Cl[Fe-](Cl)(Cl)Cl
Properties
C8H15Cl4FeN2
Molar mass 336.87 g·mol−1
Hazards
GHS labelling:[1]
GHS07: Exclamation mark
Warning
H315, H319
P264, P264+P265, P280, P302+P352, P305+P351+P338, P321, P332+P317, P337+P317, P362+P364
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Due to the presence of the high spin anion FeCl−4, the liquid is paramagnetic and reportedly has a magnetic susceptibility of 40.6 × 10−6 emu g−1.[4] A small neodymium magnet is able to attract this liquid in a test tube.

References

edit
  1. ↑ PubChem. "1-Butyl-3-methylimidazolium tetrachloroferrate". pubchem.ncbi.nlm.nih.gov. Retrieved 2026-05-05.
  2. ↑ Chemiolis (2025-01-17). Making a True Magnetic Liquid. Retrieved 2026-06-07 – via YouTube.
  3. ↑ 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.
  4. ↑ 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.


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