Chromium(IV) fluoride

Chromium(IV) fluoride
Names

IUPAC name Chromium(IV) fluoride
Other names Chromium fluoride, Chromium tetrafluoride
Identifiers
CAS Number	10049-11-3
3D model (JSmol)	Interactive image
PubChem CID	57346073
UNII	LXA70EM86D^Y
CompTox Dashboard (EPA)	DTXSID90721095
InChI InChI=1S/Cr.4FH/h;4*1H/q+4;;;;/p-4 Key: SYJRAUIOIRVQSW-UHFFFAOYSA-J
SMILES [Cr+4].[F-].[F-].[F-].[F-]
Properties
Chemical formula	CrF₄
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]
Solubility in water	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]

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Synthesis

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]

Reactions

Chromium(IV) fluoride will react with water:

{\ce {CrF4 + 2H2O -> CrO2 + 4HF}}

References

^ ^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.
^ ^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.
^ 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.