Diiron tetrabromide
- Formula: Br4Fe2
- Molecular weight: 431.306
- CAS Registry Number: 66468-24-4
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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 | -60.500 | kcal/mol | Review | Chase, 1998 | Data last reviewed in September, 1966 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 123.37 | 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 | 30.38181 |
| B | 1.996031 |
| C | -0.446689 |
| D | 0.029027 |
| E | 0.037467 |
| F | -69.51699 |
| G | 159.7690 |
| H | -60.50010 |
| 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: Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
Ionization energy determinations
| IE (eV) | Method | Reference |
|---|---|---|
| 12.6 ± 0.5 | EI | Porter and Schoonmaker, 1959 |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| Fe2Br3+ | 13.6 ± 0.5 | Br | EI | Porter and Schoonmaker, 1959 |
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]
Porter and Schoonmaker, 1959
Porter, R.F.; Schoonmaker, R.C.,
A mass spectrometric study of the vaporization of ferrous bromide,
J. Phys. Chem., 1959, 63, 626. [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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