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Niobium(V) fluoride

Niobium pentafluoride Niobium(V) bromide Niobium(V) iodide Tantalum(V) fluoride Niobium(IV) fluoride Niobium(V) fluoride, also known as niobium pentafluoride, is the inorganic compound with the formula NbF5. It is a colorless solid.

Preparation and structure

Niobium pentafluoride is obtained by treatment of any niobium compound with fluorine: :2 Nb + 5 F2 → 2 NbF5 :2 NbCl5 + 5 F2 → 2 NbF5 + 5 Cl2

As shown by X-ray crystallography, the solid consists of tetramers [NbF5]4. This structure is related to that for WOF4.

Reactions

It reacts with hydrogen fluoride to give H2NbF7, a superacid. In hydrofluoric acid, NbF5 converts to [NbF7]2- and [NbF5O]2-. The relative solubility of (M = Nb, Ta) is the basis of the Marignac process for separation of Nb and Ta.

NbCl5 forms a dimeric structure (edge-shared bioctahedron) in contrast to the corner-shared tetrameric structure of the fluoride.

References

(2005). "Niobium and Niobium Compounds". Wiley-VCH.
Homer F. Priest. (1950). "Inorganic Syntheses".
(1964). "717. The structures of niobium and tantalum pentafluorides". Journal of the Chemical Society (Resumed).

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niobium(v)-compounds fluorides metal-halides

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