Niobium(V) fluoride: Difference between revisions

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	{{chembox		{{chembox
	\| Watchedfields = changed		\| Watchedfields = changed
	\| verifiedrevid = ~~382097470~~		\| verifiedrevid = 436917297
	\| Name = Niobium(V) fluoride		\| Name = Niobium(V) fluoride
	\| ImageFile =		\| ImageFile = Niobium(V) fluoride.png
			\| ImageSize = 300px
	\| ImageName =
	\| ~~ImageFile1~~ =		\| ImageName =
			\| ImageFile1 =
	\| IUPACName = Niobium(V) fluoride<br/>Niobium pentafluoride		\| IUPACName = Niobium(V) fluoride<br/>Niobium pentafluoride
	\| Section1 = {{Chembox Identifiers		\|Section1={{Chembox Identifiers
	\| CASNo = 7783-68-8
	\| CASNo_Ref = {{cascite}}		\| CASNo_Ref = {{cascite\|correct\|??}}
	\| ~~PubChem~~ = ~~82217~~		\| CASNo = 7783-68-8
			\| UNII_Ref = {{fdacite\|correct\|FDA}}
⚫	\| EINECS =
	\| ~~RTECS~~ =		\| UNII = T86H76439H
			\| PubChem = 82217
		⚫	\| EINECS = 232-020-2
			\| RTECS =
			\| ChemSpiderID = 74197
			\| StdInChI=1S/5FH.Nb/h5*1H;/q;;;;;+5/p-5
			\| StdInChIKey = AOLPZAHRYHXPLR-UHFFFAOYSA-I
			\| SMILES = F(F)(F)(F)F
	}}		}}
	\| Section2 = {{Chembox Properties		\|Section2={{Chembox Properties
			\|Nb=1\|F=5
	\| Formula = NbF<sub>5</sub>
	\| Appearance = colorless ] ~~crystals <br> ]~~		\| Appearance = colorless ] solid
	\| MolarMass = ~~187.898 g/mol~~		\| MolarMass =
	\| Density = 3.293 g/cm<sup>3</sup>		\| Density = 3.293 g/cm<sup>3</sup>
	\| Solubility = reacts		\| Solubility = reacts
	\| SolubleOther = slightly soluble in ], ], ]		\| SolubleOther = slightly soluble in ], ], ]
	\| ~~MeltingPt~~ = ~~72-~~73 °C		\| MeltingPtC = 72 to 73
			\| MeltingPt_notes =
	\| BoilingPt = 236 °C
			\| BoilingPtC = 236
	}}		}}
	\| Section4 = {{Chembox Thermochemistry		\|Section4={{Chembox Thermochemistry
	\| DeltaHf =		\| DeltaHf =
	\| Entropy =		\| Entropy =
	}}		}}
	\| Section7 = {{Chembox Hazards		\|Section7={{Chembox Hazards
	\| ~~ExternalMSDS~~ =		\| ExternalSDS =
		⚫	\| FlashPt = Non-flammable
	\| EUIndex = Not listed
		⚫	\| PEL =
⚫	\| FlashPt = Non-flammable
			\| GHSPictograms = {{GHS05}}{{GHS07}}
⚫	\| PEL =
			\| GHSSignalWord = Warning
			\| HPhrases = {{H-phrases\|302\|312\|314\|332}}
			\| 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}}
	}}		}}
	\| Section8 = {{Chembox Related		\|Section8={{Chembox Related
	\| OtherAnions = ]<br/>]<br/>]		\| OtherAnions = ]<br/>]<br/>]
	\| OtherCations = ]<br/>]		\| OtherCations = ]<br/>]
	\| ~~OtherFunctn~~ = ]<br/>]		\| OtherFunction = ]<br/>]
	\| ~~Function~~ = niobium fluorides		\| OtherFunction_label = niobium fluorides
	}}		}}
	}}		}}
	'''Niobium(V) fluoride''', also known as '''niobium pentafluoride''', is a colorless ~~crystalline~~ solid ~~often~~ ~~used~~ as a ~~starting~~ ~~material~~ in ] ~~chemistry~~.		'''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>

	==Preparation==		==Preparation and structure==
			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>
	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.
		⚫	:2 Nb + 5 F<sub>2</sub> → 2 NbF<sub>5</sub>
			:2 NbCl<sub>5</sub> + 5 F<sub>2</sub> → 2 NbF<sub>5</sub> + 5 Cl<sub>2</sub>

			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>
	Also, niobium pentafluroide can be prepared by the reaction of fluorine with ]:

⚫	:~~2NbCl<sub>5</sub>~~ + 5F<sub>2</sub> → ~~2NbF<sub>5</sub>~~ + ~~5Cl~~<sub>2</sub>
			==Reactions==
			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.

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

	==External links==		==External links==
	*		*

			==References==
			<references />

	{{Niobium compounds}}		{{Niobium compounds}}
			{{fluorine compounds}}

	]		]
	]		]
	]		]

	]
	]

Latest revision as of 08:59, 22 January 2024

Niobium(V) fluoride
Names

IUPAC names Niobium(V) fluoride Niobium pentafluoride
Identifiers
CAS Number	7783-68-8
3D model (JSmol)	Interactive image
ChemSpider	74197
ECHA InfoCard	100.029.109
EC Number	232-020-2
PubChem CID	82217
UNII	T86H76439H
CompTox Dashboard (EPA)	DTXSID0064832
InChI InChI=1S/5FH.Nb/h5*1H;/q;;;;;+5/p-5Key: AOLPZAHRYHXPLR-UHFFFAOYSA-I
SMILES F(F)(F)(F)F
Properties
Chemical formula	F₅Nb
Molar mass	187.89839 g·mol
Appearance	colorless hygroscopic solid
Density	3.293 g/cm
Melting point	72 to 73 °C (162 to 163 °F; 345 to 346 K)
Boiling point	236 °C (457 °F; 509 K)
Solubility in water	reacts
Solubility	slightly soluble in chloroform, carbon disulfide, sulfuric acid
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312, H314, H332
Precautionary statements	P260, P261, P264, P270, P271, P280, P301+P312, P301+P330+P331, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P310, P312, P321, P322, P330, P363, P405, P501
Flash point	Non-flammable
Related compounds
Other anions	Niobium(V) chloride Niobium(V) bromide Niobium(V) iodide
Other cations	Vanadium(V) fluoride Tantalum(V) fluoride
Related niobium fluorides	Niobium(III) fluoride Niobium(IV) fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is ?) Infobox references

Chemical compound

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 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 and . The relative solubility of K₂[MFO] (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.

External links

NIST Standard Reference Database

References

Joachim Eckert; Hermann C. Starck (2005). "Niobium and Niobium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a17_251. ISBN 3527306730.
Homer F. Priest (1950). "Anhydrous Metal Fluorides". Inorganic Syntheses. Vol. 3. p. 171. doi:10.1002/9780470132340.ch47.
Edwards, A. J. (1964). "717. The structures of niobium and tantalum pentafluorides". Journal of the Chemical Society (Resumed): 3714. doi:10.1039/jr9640003714.