Chromium pentafluoride
Chromium pentafluoride is the inorganic compound with the chemical formula CrF5. It is a red volatile solid that melts at 34 °C. It is the highest known chromium fluoride, since the hypothetical chromium hexafluoride has not yet been synthesized.
| Names | |
|---|---|
| IUPAC name
Chromium(V) fluoride | |
| Other names
Chromium fluoride, Chromium(V) fluoride, Pentafluorochromium, Pentafluoridochromium | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
PubChem CID |
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SMILES
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| Properties | |
| CrF5 | |
| Molar mass | 146.988 g/mol |
| Appearance | red crystals |
| Density | 2.89 g/cm3 |
| Melting point | 34 °C (93 °F; 307 K) |
| Boiling point | 117 °C (243 °F; 390 K) |
| Structure | |
| orthorhombic | |
Space group |
Pbcm, No. 57 |
a = 782.9 pm, b = 753.4 pm, c = 551.8 pm | |
Formula units (Z) |
4 |
| octahedral | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Chromium pentafluoride is one of the products of the action of fluorine on a mixture of potassium and chromic chlorides.
In terms of its structure, the compound is a one-dimensional coordination polymer. Each Cr(V) center has octahedral molecular geometry. It has the same crystal structure as vanadium pentafluoride.
Chromium pentafluoride is strongly oxidizing, able to fluorinate the noble gas xenon and oxidize dioxygen to dioxygenyl. Due to this property, it decomposes readily in the presence of reducing agents, and easily hydrolyses to chromium(III) and chromium(VI).