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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
Deltafgas-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. - 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
Deltafliquid-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. - 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

DeltavapH (kJ/mol) Temperature (K) Reference Comment
25.8316.Nisel'son, Nikolaev, et al., 1968Based on data from 290. - 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 - 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 bullet Tungsten hexafluoride)

By formula: F- + F6W = (F- bullet F6W)

Quantity Value Units Method Reference Comment
Deltar289. ± 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 bullet Tungsten hexafluoride)

By formula: F- + F6W = (F- bullet F6W)

Quantity Value Units Method Reference Comment
Deltar289. ± 21.kJ/molTherGeorge and Beauchamp, 1979gas phase; Fluoride Affinity: SiF4 < WF6 < BF3

Mass spectrum (electron ionization)

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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: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Mass spectrum
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Additional Data

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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

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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 sigma = 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(2«nu»6)

Source: Shimanouchi, 1972

Notes

VSVery strong
SStrong
WWeak
iaInactive
pPolarized
dpDepolarized
OCFrequency estimated from an overtone or a combination tone indicated in the parentheses.
B1~3 cm-1 uncertainty
C3~6 cm-1 uncertainty
E15~30 cm-1 uncertainty

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, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, NIST Free Links, 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]

Shimanouchi, 1972
Shimanouchi, T., Tables of Molecular Vibrational Frequencies Consolidated Volume I, National Bureau of Standards, 1972, 1-160. [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, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, NIST Free Links, References