Formula NbF5 Density 3.29 g/cm³ Pubchem 82217 | Molar mass 187.898 g/mol Boiling point 236 °C | |
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Related niobium fluorides Appearance colorless monoclinic crystals; hygroscopic | ||
Niobium(V) fluoride, also known as niobium pentafluoride, is a colorless crystalline solid often used as a starting material in niobium chemistry.
Preparation
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 pentafluoride can be prepared by the reaction of fluorine with niobium pentachloride:
2NbCl5 + 5F2 → 2NbF5 + 5Cl2References
Niobium(V) fluoride Wikipedia(Text) CC BY-SA