Niobium(IV) fluoride is a chemical compound with the formula NbF4. It is a nonvolatile black solid.
Unit cell of niobium(IV) fluoride.
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Names | |
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IUPAC name
Niobium(IV) fluoride
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Other names
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Identifiers | |
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3D model (JSmol)
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ChemSpider |
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PubChem CID
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Properties | |
NbF4 | |
Molar mass | 168.9 g/mol |
Appearance | black solid |
Melting point | 350 °C (662 °F; 623 K) (decomposes) |
Structure[1] | |
tetragonal | |
I4/mmm | |
a = 4,0876(5) Å, c = 8,1351(19) Å
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[6]Nb | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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NbF4 absorbs vapor strongly and turns into NbO2F in moist air. It reacts with water to form a brown solution and a brown precipitate whose components are unknown. It is stable between 275 °C and 325 °C when heated in a vacuum. However, it disproportionates at 350 °C rapidly to form niobium(V) fluoride and niobium(III) fluoride:[2]
Niobium(IV) fluoride adopts a crystal structure analogous to that of tin(IV) fluoride, in which each niobium atom is surrounded by six fluorine atoms forming an octahedron. Of the six fluorine atoms surrounding a single niobium atom, four are bridging to adjacent octahedra, leading to a structure of octahedra connected in layers.[1]