Niobium(IV) fluoride

Niobium(IV) fluoride
	; Unit cell of niobium(IV) fluoride.
Names
	IUPAC name Niobium(IV) fluoride
	Other names Niobium tetrafluoride;
Identifiers
CAS Number	13842-88-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	9253762;
PubChem CID	11078613;
CompTox Dashboard (EPA)	DTXSID901045622 ;
	InChI InChI=1S/4FH.Nb/h4*1H;/q;;;;+4/p-4 Key: TUDPVASEPFIHNB-UHFFFAOYSA-J;
	SMILES F[Nb](F)(F)F;
Properties
Chemical formula	NbF4
Molar mass	168.9 g/mol
Appearance	black solid
Melting point	350 °C (662 °F; 623 K) (decomposes)
Structure
Crystal structure	tetragonal
Point group	I4/mmm
Lattice constant	a = 4,0876(5) Å, c = 8,1351(19) Å
Coordination geometry	[6]Nb
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Niobium(IV) fluoride is a chemical compound with the formula NbF₄. It is a nonvolatile black solid.

Properties

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]

2 NbF₄ → NbF₅ + NbF₃ (at 350 °C)

Structure

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]

References

^ ^a ^b Bandemehr, Jascha; Conrad, Matthias; Kraus, Florian (29 July 2016). "Redetermination of the crystal structure of NbF4". Acta Crystallographica Section E. 72 (8): 1211–1213. doi:10.1107/S2056989016012081. PMC 4971875. PMID 27536416.
^ 张青莲 (1981). 无机化学丛书. Beijing: Science Press. p. 323. ISBN 7-03-002238-6.

[pmid27536416-1] Bandemehr, Jascha; Conrad, Matthias; Kraus, Florian (29 July 2016). "Redetermination of the crystal structure of NbF4". Acta Crystallographica Section E. 72 (8): 1211–1213. doi:10.1107/S2056989016012081. PMC 4971875. PMID 27536416.

[2] 张青莲 (1981). 无机化学丛书. Beijing: Science Press. p. 323. ISBN 7-03-002238-6.

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