Chromium(IV) fluoride
IUPAC name
Chromium(IV) fluoride
Other names
Chromium fluoride, Chromium tetrafluoride
3D model (JSmol)
  • InChI=1S/Cr.4FH/h;4*1H/q+4;;;;/p-4
  • [Cr+4].[F-].[F-].[F-].[F-]
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).

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:


  1. ^ a b c d 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. ^ a b c Brauer, Georg (1963) [1960]. Handbuch Der Präparativen Anorganischen Chemie [Handbook of Preparative Inorganic Chemistry] (in German). Vol. 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". Canadian Journal of Chemistry. 42 (1): 50–56. doi:10.1139/v64-008. ISSN 0008-4042.