Niobium(IV) fluoride
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IUPAC name
Niobium(IV) fluoride
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Other names
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| NbF4 | |
| Molar mass | 168.9 g/mol |
| Appearance | black solid |
| Melting point | 350 °C (662 °F; 623 K) (decomposes) |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Niobium(IV) fluoride is a chemical compound with the formula NbF4; it is a nonvolatile black solid. It absorbs vapor strongly. It turns into NbO2F in moist air. NbF4 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:
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.
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