iron difluoride
- Formula: F2Fe
- Molecular weight: 93.842
- CAS Registry Number: 7789-28-8
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Gas phase thermochemistry data
Go To: Top, 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.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -389.53 | kJ/mol | Review | Chase, 1998 | Data last reviewed in September, 1965 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 265.19 | J/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1965 |
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) | 3000. to 6000. |
|---|---|
| A | 62.73657 |
| B | 2.239336 |
| C | -0.646198 |
| D | 0.050511 |
| E | 1.021960 |
| F | -407.1086 |
| G | 340.4655 |
| H | -389.5304 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1965 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry 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 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
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| <2.69291 | TDEq | Borshchevskii, Boltalina, et al., 1988 | B |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 11.3 ± 0.3 | EI | Kent and Margrave, 1965 | RDSH |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| FeF+ | 12.6 ± 0.3 | F | EI | Kent and Margrave, 1965 | RDSH |
| Fe+ | 16.5 ± 0.3 | ? | EI | Kent and Margrave, 1965 | RDSH |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics 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]
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]
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, Gas phase ion energetics 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) ΔfH°gas Enthalpy of formation of gas at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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