Diiron tetraiodide
- Formula: Fe2I4
- Molecular weight: 619.308
- CAS Registry Number: 92785-63-2
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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 |
|---|---|---|---|---|---|
| ΔfH°gas | 2.00 | kcal/mol | Review | Chase, 1998 | Data last reviewed in September, 1966 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 129.92 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1966 |
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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 6000. |
|---|---|
| A | 30.36860 |
| B | 2.093391 |
| C | -0.493497 |
| D | 0.034101 |
| E | 0.048344 |
| F | -6.981090 |
| G | 166.3440 |
| H | 2.000001 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1966 |
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 by: Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
Ionization energy determinations
| IE (eV) | Method | Reference |
|---|---|---|
| 8.9 ± 0.2 | EI | Grade and Rosinger, 1985 |
| 8.9 ± 0.2 | EI | Grade, Rosinger, et al., 1984 |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| Fe2I3+ | 9.5 ± 0.3 | I | EI | Grade, Rosinger, et al., 1984 |
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]
Grade and Rosinger, 1985
Grade, M.; Rosinger, W.,
Correlation of electronic structures and stabilities of gaseous FeI2, Fe2I2 and Fe2I4 molecules, solid [FeI2], and iodine adsorbed on [Fe],
Surf. Sci., 1985, 156, 920. [all data]
Grade, Rosinger, et al., 1984
Grade, M.; Rosinger, W.; Dowben, P.A.,
Core and valence electron binding energies of FeI2 and stabilities of gas phase species,
Ber. Bunsen-Ges. Phys. Chem., 1984, 88, 65. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
AE Appearance energy 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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