Chemistry:Chromium(IV) fluoride

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Chromium(IV) fluoride
Unit cell of alfa-CrF4.png
IUPAC name
Chromium(IV) fluoride
Other names
Chromium fluoride, Chromium tetrafluoride
3D model (JSmol)
Molar mass 127.9897 g·mol−1
Appearance green crystals,[1] amorphous brown beads[2]
Density 2.89 g/cm3[1]
Melting point 277 °C (531 °F; 550 K)[1]
Boiling point ~ 400 °C (752 °F; 673 K)[2]
reacts with water[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Chromium(IV) fluoride is an inorganic compound with the chemical formula CrF4. It has a dark greenish-black color when solid. It rapidly hydrolysizes in presence of moisture in air or directly in water.[3]


Powdered chromium or CrCl3 is exposed to fluorine gas at a temperature of 350-500 °C, which creates a mix of CrF4 and CrF5. The CrF4 settles out as varnish-like brown beads upon cooling.[2]


Chromium(IV) fluoride will react with water:

CrF4+2 H2O->CrO2+4 HF


  1. 1.0 1.1 1.2 1.3 Perry, Dale L. (2011). Handbook of Inorganic Compounds, Second Edition. Boca Raton, Florida: CRC Press. p. 125. ISBN 978-1-43981462-8. Retrieved 2014-01-10. 
  2. 2.0 2.1 2.2 Brauer, Georg (1963) (in de). Handbuch Der Präparativen Anorganischen Chemie. 1. Stuttgart; New York, New York: Ferdinand Enke Verlag; Academic Press, Inc.. p. 258. ISBN 978-0-32316127-5. Retrieved 2014-01-12. 
  3. Clark, H. C.; Sadana, Y. N. (1964-01-01). "SOME REACTIONS OF CHROMIUM TETRAFLUORIDE" (in en). Canadian Journal of Chemistry 42 (1): 50–56. doi:10.1139/v64-008. ISSN 0008-4042.