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| ImageFile=Niobtetrafluorid.png |
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| verifiedrevid = 416161059 |
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| ImageSize=250px |
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| Name = Niobium(IV) fluoride |
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| IUPACName = Niobium(IV) fluoride |
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| ImageCaption=Unit cell of niobium(IV) fluoride. |
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| Section1 = {{Chembox Identifiers |
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| verifiedrevid = 419761130 |
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| CASNo = 13842-88-1 |
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| Name = Niobium(IV) fluoride |
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| OtherNames = {{Unbulleted list |
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| Niobium tetrafluoride |
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}} |
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| IUPACName = Niobium(IV) fluoride |
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|Section1={{Chembox Identifiers |
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| CASNo_Ref = {{cascite|correct|??}} |
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| CASNo = 13842-88-1 |
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| PubChem = 11078613 |
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| ChemSpiderID = 9253762 |
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| StdInChI=1S/4FH.Nb/h4*1H;/q;;;;+4/p-4 |
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| StdInChIKey = TUDPVASEPFIHNB-UHFFFAOYSA-J |
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| SMILES = F(F)(F)F |
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| Section2 = {{Chembox Properties |
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|Section2={{Chembox Properties |
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| Formula = NbF<sub>4</sub> |
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| Formula = {{chem2|NbF4}} |
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| MolarMass = 168.9 g/mol |
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| MolarMass = 168.9 g/mol |
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| Appearance = black solid |
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| Appearance = black solid |
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| Solubility = |
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| Solubility = |
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| Solvent = |
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| Solvent = |
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| SolubleOther = |
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| SolubleOther = |
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| MeltingPt = 350 °C(decompose) |
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| MeltingPtC = 350 |
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| MeltingPt_notes = (decomposes) |
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| BoilingPt = |
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| BoilingPt = |
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| Section8 = {{Chembox Related |
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| Section3 = {{Chembox Structure |
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| Function = ] |
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| Structure_ref = <ref name=pmid27536416>{{cite journal |last1=Bandemehr |first1=Jascha |last2=Conrad |first2=Matthias |last3=Kraus |first3=Florian |title=Redetermination of the crystal structure of NbF4 |journal=Acta Crystallographica Section E |date=29 July 2016 |volume=72 |issue=8 |pages=1211–1213 |doi=10.1107/S2056989016012081 |pmid=27536416 |pmc=4971875 }}</ref> |
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| CrystalStruct = tetragonal |
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| SpaceGroup = |
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| PointGroup = I4/mmm |
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| LattConst_a = 4,0876(5) Å |
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| LattConst_b = |
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| LattConst_c = 8,1351(19) Å |
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| LattConst_alpha = |
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| LattConst_beta = |
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| LattConst_gamma = |
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| LattConst_ref = |
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| LattConst_Comment = |
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| UnitCellVolume = |
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| Coordination = Nb |
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| MolShape = |
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| OrbitalHybridisation = |
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| Dipole = |
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Niobium(IV) fluoride is a chemical compound with the ] NbF4; it is a nonvolatile black ]. It absorbs vapor strongly. It turns into NbO2F in moist air. NbF4 reacts with water strongly to form brown solution and brown precipitate whose components are unknown. It is stable between 275℃ and 325℃ when heating NbF4 in vacuum. However, it takes disproportionating reaction over 350℃ rapidly to form ] and ]: |
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'''Niobium(IV) fluoride''' is a chemical compound with the ] {{chem2|NbF4}}. It is a nonvolatile black ]. |
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:<math>\mathrm{\ 2 NbF_4 \rightarrow NbF_5 + NbF_3}</math>(at 350℃)<ref>{{Cite book | author = 张青莲 | title = 无机化学丛书 | location =Beijing | publisher =Science Press | date =1981 | pages = 323 |ISBN = 7-03-002238-6}}</ref> |
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== Reference == |
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== Properties == |
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{{chem2|NbF4}} absorbs vapor strongly and turns into {{chem2|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 ] and ]:<ref>{{Cite book | author = 张青莲 | title = 无机化学丛书 | location =Beijing | publisher =Science Press | year =1981 | pages = 323 |isbn = 7-03-002238-6}}</ref> |
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{{reflist|2}} |
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] |
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] |
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:{{chem2|2 NbF4 → NbF5 + NbF3}} (at 350 °C) |
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] |
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== Structure == |
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Niobium(IV) fluoride adopts a crystal structure analogous to that of ], 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.<ref name=pmid27536416/> |
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== References == |
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{{reflist}} |
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{{Niobium compounds}} |
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{{Fluorine compounds}} |
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] |
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] |
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] |