Niobium(V) fluoride

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Niobium(V) fluoride
Niobium(V) fluoride.png
Identifiers
CAS number 7783-68-8 YesY
PubChem 82217
Properties
Molecular formula NbF5
Molar mass 187.898 g/mol
Appearance colorless monoclinic crystals
hygroscopic
Density 3.293 g/cm3
Melting point 72 to 73 °C (162 to 163 °F; 345 to 346 K)
Boiling point 236 °C (457 °F; 509 K)
Solubility in water reacts
Solubility slightly soluble in chloroform, carbon disulfide, sulfuric acid
Hazards
EU Index Not listed
Flash point Non-flammable
Related compounds
Other anions Niobium(V) chloride
Niobium(V) bromide
Niobium(V) iodide
Other cations Vanadium(V) fluoride
Tantalum(V) fluoride
Related niobium fluorides Niobium(III) fluoride
Niobium(IV) fluoride
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Niobium(V) fluoride, also known as niobium pentafluoride, is a colorless crystalline solid often used as a starting material in niobium chemistry.

Preparation[edit]

Niobium pentafluoride is obtained as an intermediate during the recovery of niobium metal from its ores. It also can be prepared by direct fluorination of niobium metal at 250 to 300 °C, either by fluorine gas or anhydrous hydrofluoric acid. The pentafluoride vapors are condensed in a pyrex or quartz tube from which it is sublimed at 120 °C under vacuum and collected as colorless crystals.

Also, niobium pentafluroide can be prepared by the reaction of fluorine with niobium pentachloride:

2NbCl5 + 5F2 → 2NbF5 + 5Cl2

External links[edit]