Chromium(IV) fluoride explained

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.^[1]

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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.

Reactions

Chromium(IV) fluoride will react with water:

CrF4 + 2H2O -> CrO2 + 4HF

Notes and References

1. Clark. H. C.. Sadana. Y. N.. Some Reactions of Chromium Tetrafluoride . 1964-01-01. Canadian Journal of Chemistry. en. 42. 1. 50–56. 10.1139/v64-008. 0008-4042. free.