7783-71-3

Basic information

• Product Name: TANTALUM PENTAFLUORIDE
• Synonyms: TaF5;Tantalum fluoride (TaF5);tantalumfluoride(taf5);TANTALUM PENTAFLUORIDE;TANTALUM(V) FLUORIDE;TANTALUM FLUORIDE;TANTALUM (V) FLUORIDE 99.5%;TANTALUM(V) FLUORIDE 99%
• CAS NO: 7783-71-3
• Molecular Formula: F₅Ta
• Molecular Weight: 275.94
• EINECS: 232-022-3
• Product Categories: Tantalum Salts;Catalysis and Inorganic Chemistry;Chemical Synthesis;Salts;TantalumMetal and Ceramic Science;metal halide
• Mol File: 7783-71-3.mol
• Article Data: 6

Chemical Properties

• Melting Point: 96.8 °C
• Boiling Point: 229.5 °C
• Flash Point: 230°C
• Appearance: off-white/Powder
• Density: 4.74 g/mL at 25 °C(lit.)
• Water Solubility: Decomposes in water forming tantalum oxyfluoride. Soluble in conc. and fuming HNO{3}Soluble in carbon disulfide, carbon tetrach
• Sensitive: Moisture Sensitive
• Merck: 14,9055
• CAS DataBase Reference: TANTALUM PENTAFLUORIDE(CAS DataBase Reference)
• NIST Chemistry Reference: TANTALUM PENTAFLUORIDE(7783-71-3)
• EPA Substance Registry System: TANTALUM PENTAFLUORIDE(7783-71-3)

Safety Data

• Hazard Codes: C
• Statements: 34
• Safety Statements: 26-27-28-36/37/39-45
• RIDADR: UN 3260 8/PG 2
• WGK Germany: 3
• RTECS: WW5775000
• TSCA: Yes
• HazardClass: 8
• PackingGroup: II
• Hazardous Substances Data: 7783-71-3(Hazardous Substances Data)

Usage

Chemical Properties

white crystalline powder

Uses

Different sources of media describe the Uses of 7783-71-3 differently. You can refer to the following data:
1. Tantalum fluoride is a catalyst used to speed up organic chemical reactions.
2. Tantalum pentafluoride, TaF5, is used in petrochemistry as an isomerization and alkyalation catalyst. In addition, the fluoride can be utilized as a fluorination catalyst for the production of fluorinated hydrocarbons. The pentafluoride is produced by the direct fluorination of tantalum metal or by reacting anhydrous hydrogen fluoride with the corresponding pentoxide or oxychloride in the presence of a suitable dehydrating agent. The ability of TaF5 to act as a fluoride ion acceptor in anhydrous HF has been used in the preparation of salts of the AsH4, H3S, and PH4 ions. The oxyfluorides TaOF3 and TaO2F do not find any industrial application.

Safety Profile

Poison by intravenous route. Corrosive. When heated to decomposition it emits toxic fumes of F-. See also TANTALUM and FLUORIDES.

InChI:InChI=1/5FH.Ta/h5*1H;/q;;;;;+2/p-5

Synthetic route

tantalum(V) oxide + Carbonyl fluoride (353-50-4) → tantalum pentafluoride (7783-71-3) + carbon dioxide (124-38-9)

Conditions	Yield
In neat (no solvent) slight excess over the stoich. amt. of COF2 required; reaction mixt. heated in a stainless steel or monel cylinder at 210°C for 46 h;	A 100% B n/a

tantalum + hydrogen fluoride (7664-39-3) → tantalum pentafluoride (7783-71-3) + tantalum trifluoride (13814-17-0)

Conditions	Yield
300 °C;	A 90% B n/a
300 °C;	A 90% B n/a
300 °C;	A 90% B n/a

3BaF2*2TaF5 → tantalum pentafluoride (7783-71-3)

Conditions	Yield
2 h at 1000 °C;	70%
2 h at 1000 °C;	70%

tantalum + stannous fluoride → tin (7440-31-5) + tantalum pentafluoride (7783-71-3)

Conditions	Yield
In melt placing of mixt. of Ta with SnF2 (molar ratio SnF2:Ta=1.46) in Fluoroplast-4 ampule, closing by screwed stopper, exposition for 1.00 h at 240°C; various product ratio yields for various conditions; cooling, stirring up in water, collection, drying;	A 9.2% B n/a

tantalum + chlorine trifluoride (7790-91-2) → tantalum pentafluoride (7783-71-3)

Conditions	Yield
In neat (no solvent) at ambient temp.;;
heating in quartz vessel; excess ClF3 is washed out by liq. HF;
In neat (no solvent) reaction with formation of heat;;
In neat (no solvent) reaction with formation of heat;;
heating in quartz vessel; excess ClF3 is washed out by liq. HF;

tantalum + hydrogen fluoride (7664-39-3) → tantalum pentafluoride (7783-71-3)

Conditions	Yield
Kinetics; 473-593 K, 0.1-0.3 atm of HF;
In water byproducts: H2; concd. HF;;

tantalum + hydrogen fluoride (7664-39-3) → tantalum pentafluoride (7783-71-3) + hydrogen (1333-74-0)

Conditions	Yield
With dihydrogen hexachloroplatinate In water byproducts: Pt; In presence of H2PtCl6 complete reaction at ambient temp. within a few minutes; H2PtCl6 is reduced to form Pt;;	A >99 B n/a

tantalum + fluorine (7782-41-4) → tantalum pentafluoride (7783-71-3)

Conditions	Yield
in a quartz system;
in monel or Ni tube at about 300 °C; sepn. of products by cooling, then purifn. by sublimation;
In gaseous matrix Ta was reacted with F2 at 230-1200°C in Ar matrix; monitored by IR;

tantalum(V) oxide + hydrogen fluoride (7664-39-3) → tantalum pentafluoride (7783-71-3)

tantalum(V) oxide + hydrogen fluoride (7664-39-3) → tantalum pentafluoride (7783-71-3) + tantalum(V) dioxide fluoride

Conditions	Yield
200 to 500°C;

hydrogen fluoride (7664-39-3) + tantalum pentachloride (7721-01-9) → tantalum pentafluoride (7783-71-3)

hydrogen fluoride (7664-39-3) + tantalum pentachloride (7721-01-9) → hydrogenchloride (7647-01-0) + tantalum pentafluoride (7783-71-3)

Conditions	Yield
In hydrogen fluoride in 3% hydrofluoric acid for 4 min.;
In hydrogen fluoride aq. HF; in 3% hydrofluoric acid for 4 min.;

tantalum(V) dioxide fluoride + hydrogen fluoride (7664-39-3) → tantalum pentafluoride (7783-71-3)

Conditions	Yield
Kinetics; 200 to 500°C;

tantalum(V) oxide + bromine trifluoride (7787-71-5) → tantalum pentafluoride (7783-71-3)

Conditions	Yield
315°C; 15 h;	>99
315°C; 15 h;	>99

arsenic(III) fluoride (7784-35-2) + tantalum pentachloride (7721-01-9) → tantalum pentafluoride (7783-71-3)

Conditions	Yield
excess AsF3;

iron(II) niobate + hydrogen fluoride (7664-39-3) → tantalum pentafluoride (7783-71-3)

Conditions	Yield
dark red heat;
dark red heat;

tantalum + xenon difluoride (13709-36-9) → tantalum pentafluoride (7783-71-3)

Conditions	Yield
In neat (no solvent) powdered metal treated with XeF2 (air-tight autoclave, 200-300°C);

tantalum + fluorine → tantalum pentafluoride (7783-71-3)

Conditions	Yield
slight warming;;
slight warming;;

tantalum + bromine trifluoride (7787-71-5) → tantalum pentafluoride (7783-71-3)

Conditions	Yield
In further solvent(s) in cooled bromine, then heating;

BrF2(1+)*TaF6(1-)=(BrF2)TaF6 (35967-87-4) → tantalum pentafluoride (7783-71-3) + bromine trifluoride (7787-71-5)

Conditions	Yield
heating in vac.;

TaO2F → tantalum pentafluoride (7783-71-3)

Conditions	Yield
heating in dry O2;

ammonium tantalum heptafluoride → tantalum pentafluoride (7783-71-3)

Conditions	Yield
In neat (no solvent) byproducts: NH4F; heating on top of a pt-sheet;;
In neat (no solvent) byproducts: NH4F; heating on top of a pt-sheet;;

2TaF5*XeF2 → tantalum pentafluoride (7783-71-3) + xenon + fluorine (7782-41-4)

Conditions	Yield
78 °C;
78 °C;

barium tantalum octafluoride → barium fluoride + tantalum pentafluoride (7783-71-3)

Conditions	Yield
In neat (no solvent) heating in a stream of dry air at 1000 °C;;	A >99 B n/a
In neat (no solvent) heating in a stream of dry air at 1000 °C;;	A >99 B n/a

TaO2F (13597-27-8) → tantalum pentafluoride (7783-71-3) + FO7Ta3, high temperature

Conditions	Yield
850 °C in Ar stream;

tantalum-pentakis-pentafluorotellurate(VI) (82620-05-1) → tantalum pentafluoride (7783-71-3) + TeOF4

Conditions	Yield
In neat (no solvent, solid phase) slow decompn. at room temp.; mass-spectroscopy;

tantalum → tantalum pentafluoride (7783-71-3)

Conditions	Yield
With tetrafluoroethylene-vinylidene fluoride copolymer In neat (no solvent) mechanical mixt. of metal and fluoropolymer (molar ratio 1:5-6) prepd. by hot pressing on press with heating plates; heated to 423 K; load of 20MPa was applied for 5 min; cooled to 353 K; load was removed; mixt. was withdrawn or heated to 673 K; MS; TG; DSC;

tantalum pentafluoride (7783-71-3) + hydrogen bromide (10035-10-6, 12258-64-9) → C2H5OHC2H5(1+)*TaF5Br(1-)*C2H5OC2H5=HTaF5Br*2C2H5OC2H5

Conditions	Yield
With diethyl ether In diethyl ether a calcd. amt. of TaF5 was added to a soln. of HBr in ether (saturated at 0°C) under N2; the reaction vessel was left at room temp. for several hours;; after sepn. of two upper layers from the bottom layer, the solvent was pumped off from the latter at 5 Torr and 25°C within 40 min; elem.anal.;;	85%

tantalum pentafluoride (7783-71-3) + phenyltrimethylsilyl ether (1529-17-5) → TaF4(OPh) (61436-53-1)

Conditions	Yield
In dichloromethane at 20℃; for 5 - 10h; Inert atmosphere; Schlenk technique;	85%

tantalum pentafluoride (7783-71-3) + triphenylarsineoxide (1153-05-5, 856568-31-5) → [TaF5(OAs(phenyl)3)] (71667-25-9)

Conditions	Yield
In dichloromethane for 0.333333h; Inert atmosphere; Schlenk technique;	85%

tantalum pentafluoride (7783-71-3) + ortho-phenylenebis(dimethylarsine) (13246-32-7) → [TaF4{o-C6H4(AsMe2)2}2][TaF6] (1614218-74-4)

Conditions	Yield
In acetonitrile for 1.33333h; Inert atmosphere; Schlenk technique;	85%

tantalum pentafluoride (7783-71-3) + 1,3-bis-(2,6-diisopropylphenyl)-imidazol-2-ylidene (244187-81-3) → C27H36F5N2Ta

Conditions	Yield
In toluene at 20℃; for 14h; Glovebox; Schlenk technique; Inert atmosphere;	83.6%

1,10-Phenanthroline (66-71-7) + tantalum pentafluoride (7783-71-3) → [TaF4(1,10-phenanthroline)2][TaF6] (1562735-17-4)

Conditions	Yield
In dichloromethane Inert atmosphere; Schlenk technique;	83%

tantalum pentafluoride (7783-71-3) + 1,2-bis(dimethylphosphanyl)ethane (23936-60-9) → [TaF4{Me2P(CH2)2PMe2}2][TaF6] (1614218-76-6)

Conditions	Yield
In acetonitrile for 1h; Inert atmosphere; Schlenk technique;	83%

tantalum pentafluoride (7783-71-3) + 2,3,5,6,8,9,11,12-octahydro-1,4,7,10,13-benzopentaoxacyclopentadecin + hydrogen fluoride (7664-39-3) + water (7732-18-5) → [(benzo-15-crown-5)2*H5O2][TaF6][(benzo-15-crown-5)2*H3O][TaF6]

Conditions	Yield
In hydrogen fluoride aq. HF; TaF5 in aq. 45% HF added to soln. of crown ether; stored at 20-25°C in exsiccator for a low evapn. of solvent over several days;	82%

tantalum pentafluoride (7783-71-3) + 1,4-difluoro-2,5-dimethoxybenzene → (TaF5)2[μ-κ2-1,4-(OMe)2-2,5-C6H2F2] (1236036-54-6)

Conditions	Yield
In dichloromethane under Ar using standard Schlenk techniques; TaF5 (0.50 mmol) added to stirred soln. of 1,4-(OMe)2-2,5-C6H2F2 (0.25 mmol); stirred (4 h); crystd. from CH2Cl2/pentane (-20°C); elem. anal.;	82%

titanium(IV) oxide bis(2,4-pentanedionate) + tantalum pentafluoride (7783-71-3) → [TaF4{OTi(acac)2}2]-[TaF6]

Conditions	Yield
In dichloromethane-d2 for 0.5h; Schlenk technique; Inert atmosphere;	82%

tantalum pentafluoride (7783-71-3) + Triphenylphosphine oxide (791-28-6) → [TaF5(OP(phenyl)3)] (62550-41-8)

Conditions	Yield
In dichloromethane Inert atmosphere; Schlenk technique;	81%
In dichloromethane (N2); triphenylphosphine oxide added to a soln. of TaF5 in equimolar ratio; evapd.; washed with toluene; dried; elem. anal.;
In toluene (N2); triphenylphosphine oxide added to a soln. of TaF5 in equimolar ratio; cooled to room temp.; pptd.; separated; washed with toluene; dried; elem. anal.;
In acetonitrile (N2); triphenylphosphine oxide added to a soln. of TaF5 in equimolar ratio; evapd.; washed with toluene; dried; elem. anal.;

tantalum pentafluoride (7783-71-3) + chloroacetic acid (79-11-8) → [TaF4(chloroacetic acid)2][TaF6]

Conditions	Yield
In dichloromethane (Ar); suspension of TaF5 in CH2Cl2 treated with CH2ClCOOH; stirred for 30 min; layered with pentane; 12 h; elem. anal.;	81%

tantalum pentafluoride (7783-71-3) + phenyltrimethylsilyl ether (1529-17-5) → TaF3(OPh)2 (1409932-37-1)

Conditions	Yield
In dichloromethane at 20℃; for 5 - 10h; Inert atmosphere; Schlenk technique;	81%

tetrahydrofuran (109-99-9) + tantalum pentafluoride (7783-71-3) → [TaF5(C4H8O)] (1004510-59-1)

Conditions	Yield
In tetrahydrofuran; dichloromethane (Ar); std. Schlenk technique; suspn. of TaF5 in CH2Cl2 was treated with THF (0.5 equiv.); mixt. was stirred at room temp. for 30 min; filtered; dried (vac.); crystd. (CH2Cl2/pentane, -30°C); elem. anal.;	79%
In dichloromethane-d2 Ar, a large excess of THF aded to a suspn., reacted for 1 min; not isolated, detected by NMR;
In tetrahydrofuran; chloroform (Ar); std. Schlenk technique; suspn. of TaF5 in CHCl3 was treated with THF (2 equiv.); mixt. was refluxed;

tantalum pentafluoride (7783-71-3) + 1,2-dimethoxybenzene (91-16-7) → [TaF4(κ2-1,2-dimethoxybenzene)][Nb2F11]

Conditions	Yield
In dichloromethane under Ar using standard Schlenk techniques; suspn. of TaF5 (0.60 mmol) treated with 1,2-dimethoxybenzene (0.60 mmol); stirred (2 h); filtered; dried (vac.); solvent removed; elem. anal.;	79%

Upstream product

• 7664-39-3 hydrogen fluoride 
• 13597-27-8 TaO₂F 
• 82620-05-1 tantalum-pentakis-pentafluorotellurate(VI) 
• 35967-87-4 BrF₂⁽¹⁺⁾*TaF₆^(1-)=(BrF₂)TaF₆ 
• 7787-71-5 bromine trifluoride 
• 353-50-4 Carbonyl fluoride 
• 13709-36-9 xenon difluoride 
• 7784-35-2 arsenic(III) fluoride 
• 7721-01-9 tantalum pentachloride 
• 7782-41-4 fluorine 
• 7790-91-2 chlorine trifluoride 

Downstream Products

• 354-21-2 1,1,2-trichloro-2,2-difluoroethane 
• 33380-11-9 ammonium tantalum hexafluoride 
• 78245-34-8 cis-TaF₄(OPh)2(I) 
• 72954-41-7 TaF₅(OC₆H₅)^(1-) 
• 78245-35-9 cis-TaF₂(OPh)4(I) 
• 78306-71-5 cis-TaF₃(OPh)3(I) 
• 78306-71-5 trans-TaF₃(OPh)3(I) 
• 126757-08-2 boron trifluoride monohydrate 
• 7783-72-4 vanadium pentafluoride 
• 54335-55-6 XeF⁽¹⁺⁾*TaF₆^(1-)={XeF}{TaF₆} 
• 20263-47-2 Tantalum Oxyfluoride 
• 1236036-62-6 (TaF5)2[μ-κ2-1,2-diphenoxyethane] 
• 1236036-54-6 (TaF5)2[μ-κ2-1,4-(OMe)2-2,5-C6H2F2] 
• 1562379-17-2 [TaF₄(NMe₂-C₆H₅)₂][TaF₆] 

Relevant articles and documents

(N2H6)3TaF8TaF7HF2and Na7TaF8(TaF7)2: Novel fluoride tantalates with different isolated anionic polyhedra

The reaction of hydrazinium difluoride and TaF5in 66% hydrofluoric acid water solution resulted in the formation of rather unusual (N2H6)3TaF8TaF7HF2compound. Similar procedure started from a TaF5[sbnd]NaF mixture performed in 35% HF water solution resulted in the formation of a Na7TaF8(TaF7)2compound. Synthesis, crystal structures and Raman spectra of these new compounds are reported in this communication. The main feature of both compounds is the presence of discrete TaF83?and TaF72?anions in their crystal structures, which was also confirmed by Raman spectroscopy.

Chemical interaction of fluoropolymers with transition metals

Chemical interaction of transition metals (Mo, W, Ta, Nb, and Ti) with a tetrafluoroethylene-vinylidene fluoride (TFE-VDF) copolymer (21 mol % TFE + 79 mol % VDF) has been studied by differential scanning calorimetry (DSC) and mass spectrometry. The DSC c

The infrared spectra of products of tantalum and ruthenium reactions with fluorine isolated in solid argon

The IR spectra of the products formed when molecular fluorine was passed over tantalum and ruthenium heated to 100-1100°C and isolated in inert matrices at 12 K were studied. In the Ta + F2 system, bands of (TaF5)3, TaF5, and TaF4 were observed. In the Ru + F2 system, the major reaction product was monomeric ruthenium pentafluoride. The structures of metal fluorides of various compositions are discussed.