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| verifiedrevid = 382097470 |
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| verifiedrevid = 436917297 |
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| Name = Niobium(V) fluoride |
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| Name = Niobium(V) fluoride |
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| ImageFile = |
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| ImageFile = Niobium(V) fluoride.png |
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| ImageSize = 300px |
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| ImageName = |
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| ImageFile1 = |
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| ImageName = |
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| ImageFile1 = |
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| IUPACName = Niobium(V) fluoride<br/>Niobium pentafluoride |
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| IUPACName = Niobium(V) fluoride<br/>Niobium pentafluoride |
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| Section1 = {{Chembox Identifiers |
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|Section1={{Chembox Identifiers |
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| CASNo = 7783-68-8 |
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| CASNo_Ref = {{cascite}} |
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| CASNo_Ref = {{cascite|correct|??}} |
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| PubChem = 82217 |
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| CASNo = 7783-68-8 |
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| UNII_Ref = {{fdacite|correct|FDA}} |
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| EINECS = |
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| RTECS = |
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| UNII = T86H76439H |
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| PubChem = 82217 |
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| EINECS = 232-020-2 |
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| RTECS = |
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| ChemSpiderID = 74197 |
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| StdInChI=1S/5FH.Nb/h5*1H;/q;;;;;+5/p-5 |
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| StdInChIKey = AOLPZAHRYHXPLR-UHFFFAOYSA-I |
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| SMILES = F(F)(F)(F)F |
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| Section2 = {{Chembox Properties |
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|Section2={{Chembox Properties |
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|Nb=1|F=5 |
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| Formula = NbF<sub>5</sub> |
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| Appearance = colorless ] crystals <br> ] |
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| Appearance = colorless ] solid |
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| MolarMass = 187.898 g/mol |
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| MolarMass = |
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| Density = 3.293 g/cm<sup>3</sup> |
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| Density = 3.293 g/cm<sup>3</sup> |
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| Solubility = reacts |
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| Solubility = reacts |
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| SolubleOther = slightly soluble in ], ], ] |
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| SolubleOther = slightly soluble in ], ], ] |
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| MeltingPt = 72-73 °C |
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| MeltingPtC = 72 to 73 |
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| MeltingPt_notes = |
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| BoilingPt = 236 °C |
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| BoilingPtC = 236 |
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| Section4 = {{Chembox Thermochemistry |
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|Section4={{Chembox Thermochemistry |
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| DeltaHf = |
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| DeltaHf = |
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| Entropy = |
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| Entropy = |
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| Section7 = {{Chembox Hazards |
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|Section7={{Chembox Hazards |
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| ExternalMSDS = |
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| ExternalSDS = |
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| FlashPt = Non-flammable |
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| EUIndex = Not listed |
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| PEL = |
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| FlashPt = Non-flammable |
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| GHSPictograms = {{GHS05}}{{GHS07}} |
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| PEL = |
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| GHSSignalWord = Warning |
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| HPhrases = {{H-phrases|302|312|314|332}} |
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| PPhrases = {{P-phrases|260|261|264|270|271|280|301+312|301+330+331|302+352|303+361+353|304+312|304+340|305+351+338|310|312|321|322|330|363|405|501}} |
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| Section8 = {{Chembox Related |
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|Section8={{Chembox Related |
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| OtherAnions = ]<br/>]<br/>] |
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| OtherAnions = ]<br/>]<br/>] |
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| OtherCations = ]<br/>] |
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| OtherCations = ]<br/>] |
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| OtherFunctn = ]<br/>] |
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| OtherFunction = ]<br/>] |
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| Function = niobium fluorides |
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| OtherFunction_label = niobium fluorides |
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'''Niobium(V) fluoride''', also known as '''niobium pentafluoride''', is a colorless crystalline solid often used as a starting material in ] chemistry. |
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'''Niobium(V) fluoride''', also known as '''niobium pentafluoride''', is the ] with the formula NbF<sub>5</sub>. It is a colorless solid.<ref name=Ullmann>{{cite encyclopedia|author1=Joachim Eckert |author2=Hermann C. Starck|title=Niobium and Niobium Compounds|encyclopedia=Ullmann's Encyclopedia of Industrial Chemistry|year=2005|publisher=Wiley-VCH|place=Weinheim|doi=10.1002/14356007.a17_251|isbn=3527306730}}</ref> |
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==Preparation== |
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==Preparation and structure== |
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Niobium pentafluoride is obtained by treatment of any niobium compound with fluorine:<ref>{{cite book|chapter=Anhydrous Metal Fluorides|author=Homer F. Priest|title=Inorganic Syntheses |year=1950|volume=3|page=171|doi=10.1002/9780470132340.ch47}}</ref> |
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Niobium pentafluoride is obtained as an intermediate during the recovery of ] metal from its ores. It also can be prepared by direct fluorination of niobium metal at 250 to 300°C, either by ] gas or anhydrous ]. The pentafluoride vapors are condensed in a ] or ] tube from which it is sublimed at 120°C under vacuum and collected as colorless crystals. |
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:2 Nb + 5 F<sub>2</sub> → 2 NbF<sub>5</sub> |
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:2 NbCl<sub>5</sub> + 5 F<sub>2</sub> → 2 NbF<sub>5</sub> + 5 Cl<sub>2</sub> |
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As shown by ], the solid consists of tetramers <sub>4</sub>. This structure is related to that for WOF<sub>4</sub>.<ref>{{cite journal |doi=10.1039/jr9640003714 |title=717. The structures of niobium and tantalum pentafluorides |year=1964 |last1=Edwards |first1=A. J. |journal=Journal of the Chemical Society (Resumed) |page=3714 }}</ref> |
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Also, niobium pentafluroide can be prepared by the reaction of fluorine with ]: |
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:2NbCl<sub>5</sub> + 5F<sub>2</sub> → 2NbF<sub>5</sub> + 5Cl<sub>2</sub> |
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==Reactions== |
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It reacts with ] to give H<sub>2</sub>NbF<sub>7</sub>, a ]. In ], NbF<sub>5</sub> converts to <sup>2-</sup> and <sup>2-</sup>. The relative solubility of {{chem2|K2}} (M = Nb, Ta) is the basis of the ] for separation of Nb and Ta. |
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] forms a dimeric structure (edge-shared bioctahedron) in contrast to the corner-shared tetrameric structure of the fluoride. |
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==External links== |
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==External links== |
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==References== |
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<references /> |
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{{Niobium compounds}} |
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{{Niobium compounds}} |
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{{fluorine compounds}} |
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