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
View 3d structure (requires JavaScript / HTML 5) - Other names: Tungsten fluoride (WF6), (OC-6-11)-; Tungsten fluoride (WF6); Tungsten(VI) fluoride; Tungsten fluoride; UN 2196; WF6
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Condensed 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°liquid | -1748.37 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1967 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 249.22 | J/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 (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 1000. |
|---|---|
| A | 169.4520 |
| B | 4.695411×10-7 |
| C | -5.898436×10-7 |
| D | 2.491422×10-7 |
| E | 3.342912×10-9 |
| F | -1798.894 |
| G | 454.2820 |
| H | -1748.372 |
| 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 (kJ/mol) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 25.8 | 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 (bar)
T = temperature (K)
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| Temperature (K) | A | B | C | Reference | Comment |
|---|---|---|---|---|---|
| 201.5 to 290.4 | 4.55569 | 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° | 289. ± 21. | kJ/mol | Ther | George and Beauchamp, 1979 | gas phase; Fluoride Affinity: SiF4 < WF6 < BF3 |
Ion clustering 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. Searches may be limited to ion clustering reactions. A general reaction search form is also available.
Clustering reactions
+
= (
•
)
By formula: F- + F6W = (F- • F6W)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 289. ± 21. | kJ/mol | Ther | George and Beauchamp, 1979 | gas phase; Fluoride Affinity: SiF4 < WF6 < BF3 |
Vibrational and/or electronic energy levels
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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: Takehiko Shimanouchi
Symmetry: Oh Symmetry Number σ = 24
| Sym. | No | Approximate | Selected Freq. | Infrared | Raman | Comments | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Species | type of mode | Value | Rating | Value | Phase | Value | Phase | |||
| a1g | 1 | Sym str | 771 | B | ia | 771.0 VS p | gas | |||
| eg | 2 | Deg str | 677 | B | ia | 677.2 W dp | gas | |||
| f1u | 3 | Deg str | 712 | C | 712 VS | ia | ||||
| f1u | 4 | Deg deform | 258 | C | 258 S | ia | ||||
| f2g | 5 | Deg deform | 320 | C | ia | 320 W dp | gas | |||
| f2u | 6 | Deg deform | 127 | E | ia | ia | OC(2ν6) | |||
Source: Shimanouchi, 1972
Notes
| VS | Very strong |
| S | Strong |
| W | Weak |
| ia | Inactive |
| p | Polarized |
| dp | Depolarized |
| OC | Frequency estimated from an overtone or a combination tone indicated in the parentheses. |
| B | 1~3 cm-1 uncertainty |
| C | 3~6 cm-1 uncertainty |
| E | 15~30 cm-1 uncertainty |
References
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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]
Shimanouchi, 1972
Shimanouchi, T.,
Tables of Molecular Vibrational Frequencies Consolidated Volume I, National Bureau of Standards, 1972, 1-160. [all data]
Notes
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- Symbols used in this document:
S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) 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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