Names | |
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IUPAC name
Chromium(V) fluoride
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Other names
Chromium fluoride, Chromium(V) fluoride, Pentafluorochromium, Pentafluoridochromium
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Identifiers | |
3D model (
JSmol)
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ChemSpider | |
PubChem
CID
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Properties [1] | |
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 [2] | |
orthorhombic | |
Pbcm, No. 57 | |
a = 782.9 pm, b = 753.4 pm, c = 551.8 pm
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Formula units (Z)
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4 |
octahedral | |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
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Chromium pentafluoride is the inorganic compound with the chemical formula CrF5. [3] It is a red volatile solid that melts at 34 °C. [1] It is the highest known chromium fluoride, since the hypothetical chromium hexafluoride has not yet been synthesized. [4]
Chromium pentafluoride is one of the products of the action of fluorine on a mixture of potassium and chromic chlorides. [5]
In terms of its structure, the compound is a one-dimensional coordination polymer. Each Cr(V) center has octahedral molecular geometry. [2] It has the same crystal structure as vanadium pentafluoride. [6]
Chromium pentafluoride is strongly oxidizing, able to fluorinate the noble gas xenon and oxidize dioxygen to dioxygenyl. [2] Due to this property, it decomposes readily in the presence of reducing agents, and easily hydrolyses to chromium(III) and chromium(VI). [7]
Chromium pentafluoride can react with Lewis bases such as caesium fluoride and nitryl fluoride to give the respective hexafluorochromate(V) salt. [8]
Chromium pentafluoride can also react with the Lewis acid antimony pentafluoride to give the CrF5·2SbF5 adduct. The adduct was found to be a strong oxidizing agent, liquid at room temperature with a melting point of −23 °C. [8]