Chromium Tetrafluoride

Title: Chromium Tetrafluoride
CAS Registry Number: 10049-11-3
Molecular Formula: CrF4
Molecular Weight: 127.99
Percent Composition: Cr 40.63%, F 59.37%
Literature References: Prepd by reaction of F2 with Cr or CrCl3: von Wartenberg, Z. Anorg. Allg. Chem. 247, 136 (1941); Clark, Sadana, Can. J. Chem. 43, 50 (1964).
Properties: Very dark greenish-black, amorphous solid; on exposure to moist air becomes brown on surface due to hydrolysis. mp (estimated) 277°: Fergusson in Halogen Chemistry Vol. 3, V. Gutmann, Ed. (Academic Press, New York, 1967) p 242. bp ~400° evolving steel-blue vapor; sublimes in vacuo above 100°; d 2.89. Less reactive than CrF3, does not readily form Werner complexes; does not react with NH3, SO2, SO3, pyridine. Sol in water with rapid hydrolysis; practically insol in most organic solvents. Can be stored indefinitely in vacuo in well dried Pyrex or silica vessels.
Melting point: mp (estimated) 277°: Fergusson in Halogen Chemistry Vol. 3, V. Gutmann, Ed. (Academic Press, New York, 1967) p 242
Boiling point: bp ~400°
Density: d 2.89
Status: This monograph has been retired and is no longer subject to revision or update.
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