iron difluoride

• Formula: F₂Fe
• Molecular weight: 93.842
• CAS Registry Number: 7789-28-8
• Information on this page:
  • Gas phase thermochemistry data
  • Condensed phase thermochemistry data
  • Phase change data
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • Ion clustering data
  • References
  • Notes
• Data at other public NIST sites:
  • X-ray Photoelectron Spectroscopy Database, version 5.0
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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.

Gas Phase Heat Capacity (Shomate Equation)

C_p° = 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
    C_p = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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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.

Liquid Phase Heat Capacity (Shomate Equation)

C_p° = 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
    C_p = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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Solid Phase Heat Capacity (Shomate Equation)

C_p° = 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
    C_p = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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View table.

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 by: William E. Acree, Jr., James S. Chickos

Enthalpy of sublimation

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

(F^- • 4294967295F₂Fe) + F₂Fe = F^-

By formula: (F^- • 4294967295F₂Fe) + F₂Fe = F^-

F₃Fe^- + F₂Fe = F₅Fe₂^-

By formula: F₃Fe^- + F₂Fe = F₅Fe₂^-

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:
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess

View reactions leading to F₂Fe⁺ (ion structure unspecified)

Electron affinity determinations

Ionization energy determinations

Appearance energy determinations

Ion clustering data

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: 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

(F^- • 4294967295F₂Fe) + F₂Fe = F^-

By formula: (F^- • 4294967295F₂Fe) + F₂Fe = F^-

F₃Fe^- + F₂Fe = F₅Fe₂^-

By formula: F₃Fe^- + F₂Fe = F₅Fe₂^-

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]

Bardi, Brunetti, et al., 1996
Bardi, Gianpiero; Brunetti, Bruno; Piacente, Vincenzo, Vapor Pressure and Standard Enthalpies of Sublimation of Iron Difluoride, Iron Dichloride, and Iron Dibromide, J. Chem. Eng. Data, 1996, 41, 1, 14-20, https://doi.org/10.1021/je950115w . [all data]

Zhuravleva, Alikhanyan, et al., 1976
Zhuravleva, L.V.; Alikhanyan, A.S.; Sidorov, L.N., Russ. J. Phys. Chem., 1976, 50, 818. [all data]

Boltalina, Borshchevskii, et al., 1992
Boltalina, O.V.; Borshchevskii, A.Y.; Sidorov, L.N., Thermochemistry of 3d Elements Fluorides and Their Negative Ions in Gas Phase, Russ. J. Phys. Chem., 1992, 66, 1223. [all data]

Borshchevskii, Boltalina, et al., 1988
Borshchevskii, A.Ya.; Boltalina, O.V.; Sorokin, I.D.; Sidorov, L.N., Thermochemical Quantities for Gas Phase Iron, Uranium, and Molybdenum Fluorides, and Their Negative Ions., J. Chem. Thermodyn., 1988, 20, 5, 523, https://doi.org/10.1016/0021-9614(88)90080-8 . [all data]

Kuznetsov, Korobov, et al., 1986
Kuznetsov, S.V.; Korobov, M.V.; Savinova, L.N.; Sidirov, L.N., Enthalpy of the addition of the F^- ion to copper and iron difluorides, Russ. J. Phys. Chem., 1986, 60, 766. [all data]

Sidirov, Borshchevsky, et al., 1986
Sidirov, L.N.; Borshchevsky, A.Ya.; Boltalina, O.V.; Sorokin, I.D.; Skokan, E.V., Electron affinities of gaseous iron fluorides and dimers, Int. J. Mass Spectrom. Ion Processes, 1986, 73, 1. [all data]

Sorokin, Sidorov, et al., 1981
Sorokin, I.D.; Sidorov, L.N.; Nikitin, M.I.; Skokan, E.V., Mass-spectrometric determination of the enthalpies of dissociation of gaseous complex fluorides into neutral and charged particles. V. Heats of formation of FeF₃- and FeF₄-, Int. J. Mass Spectrom. Ion Phys., 1981, 41, 45. [all data]

Kent and Margrave, 1965
Kent, R.A.; Margrave, J.L., Mass spectrometric studies at high temperatures. VIII. The sublimation pressure of iron(II) fluoride, J. Am. Chem. Soc., 1965, 87, 4754. [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

• 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)
  S°solid	Entropy of solid at standard conditions
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔfH°liquid	Enthalpy of formation of liquid at standard conditions
  ΔfH°solid	Enthalpy of formation of solid at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔsubH	Enthalpy of sublimation
  ΔsubH°	Enthalpy of sublimation at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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