Tungsten hexafluoride

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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
Δfgas-1721.72kJ/molReviewChase, 1998Data last reviewed in March, 1967
Quantity Value Units Method Reference Comment
gas,1 bar340.89J/mol*KReviewChase, 1998Data 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 (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 1000. to 6000.
A 150.7897
B 6.066256
C -1.633941
D 0.138912
E -3.068132
F -1777.217
G 504.3728
H -1721.716
ReferenceChase, 1998
Comment Data last reviewed in March, 1967

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
Δfliquid-1748.37kJ/molReviewChase, 1998Data last reviewed in March, 1967
Quantity Value Units Method Reference Comment
liquid,1 bar249.22J/mol*KReviewChase, 1998Data 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
ReferenceChase, 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
25.8316.Nisel'son, Nikolaev, et al., 1968Based 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 290.44.555691021.208-64.70Stull, 1947Coefficents 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

Fluorine anion + Tungsten hexafluoride = (Fluorine anion • Tungsten hexafluoride)

By formula: F- + F6W = (F- • F6W)

Quantity Value Units Method Reference Comment
Δr289. ± 21.kJ/molTherGeorge and Beauchamp, 1979gas 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 ± 0.20IMRBViggiano, Paulson, et al., 1985B
3.50 ± 0.10IMRBGeorge and Beauchamp, 1979EA: > F-, < Cl-; B
>5.10 ± 0.50NBIECompton, Reinhardt, et al., 1978B
3.70 ± 0.20NBIEDispert and Lacmann, 1977B
>4.90 ± 0.40NBIEMathur, Rothe, et al., 1977B
2.74061SIPage and Goode, 1969The Magnetron method, lacking mass analysis, is not considered reliable.; B

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
F3W+24.0 ± 0.5?EIHildenbrand, 1975LLK
F4W+19.5 ± 0.32FEIHildenbrand, 1975LLK
F5W+15.24 ± 0.10FEIHildenbrand, 1975LLK

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

Fluorine anion + Tungsten hexafluoride = (Fluorine anion • Tungsten hexafluoride)

By formula: F- + F6W = (F- • F6W)

Quantity Value Units Method Reference Comment
Δr289. ± 21.kJ/molTherGeorge and Beauchamp, 1979gas phase; Fluoride Affinity: SiF4 < WF6 < BF3

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, 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, Ion clustering data, References