Tungsten hexafluoride
- Formula: F6W
- Molecular weight: 297.83
- IUPAC Standard InChI: InChI=1S/6FH.W/h6*1H;/q;;;;;;+6/p-6
- IUPAC Standard InChIKey: NXHILIPIEUBEPD-UHFFFAOYSA-H
- CAS Registry Number: 7783-82-6
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Tungsten fluoride (WF6), (OC-6-11)-; Tungsten fluoride (WF6); Tungsten(VI) fluoride; Tungsten fluoride; UN 2196; WF6
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Gas phase thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -411.501 | kcal/mol | Review | Chase, 1998 | Data last reviewed in March, 1967 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 81.475 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1967 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 1000. to 6000. |
|---|---|
| A | 36.03960 |
| B | 1.449870 |
| C | -0.390521 |
| D | 0.033201 |
| E | -0.733301 |
| F | -424.7651 |
| G | 120.5480 |
| H | -411.5000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in March, 1967 |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Mass spectrum (electron ionization), References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -417.870 | kcal/mol | Review | Chase, 1998 | Data last reviewed in March, 1967 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 59.565 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1967 |
Liquid Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 1000. |
|---|---|
| A | 40.50000 |
| B | 1.122230×10-7 |
| C | -1.409761×10-7 |
| D | 5.954640×10-8 |
| E | 7.989750×10-10 |
| F | -429.9460 |
| G | 108.5760 |
| H | -417.8709 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in March, 1967 |
Phase change data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
AC - William E. Acree, Jr., James S. Chickos
Enthalpy of vaporization
| ΔvapH (kcal/mol) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 6.17 | 316. | Nisel'son, Nikolaev, et al., 1968 | Based on data from 290. to 343. K.; AC |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (atm)
T = temperature (K)
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| Temperature (K) | A | B | C | Reference | Comment |
|---|---|---|---|---|---|
| 201.5 to 290.4 | 4.54998 | 1021.208 | -64.70 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
Reaction thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: John E. Bartmess
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
+
= (
•
)
By formula: F- + F6W = (F- • F6W)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 69.0 ± 5.0 | kcal/mol | Ther | George and Beauchamp, 1979 | gas phase; Fluoride Affinity: SiF4 < WF6 < BF3 |
Gas phase ion energetics data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
B - John E. Bartmess
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 3.36 ± 0.20 | IMRB | Viggiano, Paulson, et al., 1985 | B |
| 3.50 ± 0.10 | IMRB | George and Beauchamp, 1979 | EA: > F-, < Cl-; B |
| >5.10 ± 0.50 | NBIE | Compton, Reinhardt, et al., 1978 | B |
| 3.70 ± 0.20 | NBIE | Dispert and Lacmann, 1977 | B |
| >4.90 ± 0.40 | NBIE | Mathur, Rothe, et al., 1977 | B |
| 2.74061 | SI | Page and Goode, 1969 | The Magnetron method, lacking mass analysis, is not considered reliable.; B |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| F3W+ | 24.0 ± 0.5 | ? | EI | Hildenbrand, 1975 | LLK |
| F4W+ | 19.5 ± 0.3 | 2F | EI | Hildenbrand, 1975 | LLK |
| F5W+ | 15.24 ± 0.10 | F | EI | Hildenbrand, 1975 | LLK |
Mass spectrum (electron ionization)
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Spectrum
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Additional Data
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Due to licensing restrictions, this spectrum cannot be downloaded.
| Owner | NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
|---|---|
| Origin | GOODYEAR ATOMIC CORPORATION, PORTSMOUTH, OHIO |
| NIST MS number | 34215 |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Mass spectrum (electron ionization), Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Nisel'son, Nikolaev, et al., 1968
Nisel'son, L.A.; Nikolaev, R.K.; Sokolova, T.D.; Stolyarov, V.I.; Korolev, Yu.M.,
Izv. Sib. Otd. Akad. Nauk SSSR, Ser. Khim. Nauk, 1968, 109. [all data]
Stull, 1947
Stull, Daniel R.,
Vapor Pressure of Pure Substances. Organic and Inorganic Compounds,
Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022
. [all data]
George and Beauchamp, 1979
George, P.M.; Beauchamp, J.L.,
The electron and fluoride affinites of tungsten hexafluoride by ICR spectroscopy,
Chem. Phys., 1979, 36, 345. [all data]
Viggiano, Paulson, et al., 1985
Viggiano, A.A.; Paulson, J.F.; Dale, F.; Henchman, M.; Adams, N.G.; Smith, D.,
Ion chemistry and electon affinity of WF6,
J. Phys. Chem., 1985, 89, 2264. [all data]
Compton, Reinhardt, et al., 1978
Compton, R.N.; Reinhardt, P.W.; Cooper, C.D.,
Collisional ionization between fast alkali atoms and selected hexafluoride molecules,
J. Chem. Phys., 1978, 68, 2023. [all data]
Dispert and Lacmann, 1977
Dispert, H.; Lacmann, K.,
Formation of WF6- and its dissociative products by collisional ionization,
Chem. Phys. Lett., 1977, 45, 311. [all data]
Mathur, Rothe, et al., 1977
Mathur, B.P.; Rothe, R.W.; Reck, G.P.,
Ionization reactions of metal hexafluorides with alkali atoms and dimers,
J. Chem. Phys., 1977, 67, 377. [all data]
Page and Goode, 1969
Page, F.M.; Goode, G.C.,
Negative Ions and the Magnetron., Wiley, NY, 1969. [all data]
Hildenbrand, 1975
Hildenbrand, D.L.,
Thermochemistry of the gaseous tungsten fluorides,
Chem. Phys. Lett., 1975, 62, 3074. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Mass spectrum (electron ionization), References
- Symbols used in this document:
AE Appearance energy EA Electron affinity S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔrH° Enthalpy of reaction at standard conditions ΔvapH Enthalpy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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