Aluminum difluoride
- Formula: AlF2
- Molecular weight: 64.9783450
- CAS Registry Number: 13569-23-8
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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 | -166.00 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1976 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 63.145 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1976 |
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 2000. | 2000. to 6000. |
|---|---|---|
| A | 11.24060 | 15.09560 |
| B | 4.690271 | -0.717936 |
| C | -2.953000 | 0.141589 |
| D | 0.630050 | -0.006479 |
| E | -0.129184 | -1.532401 |
| F | -169.9690 | -173.2680 |
| G | 74.74849 | 78.22710 |
| H | -166.0000 | -166.0000 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in June, 1976 | Data last reviewed in June, 1976 |
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:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess
View reactions leading to AlF2+ (ion structure unspecified)
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 2.25 ± 0.13 | TDEq | Srivastava, Uy, et al., 1974 | EA: 26.5 kcal < EA(F), new EA(F) data used; B |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 10. | EI | Uy, Srivastava, et al., 1972 | LLK |
| 9. ± 1. | EI | Ehlert and Margrave, 1964 | 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]
Srivastava, Uy, et al., 1974
Srivastava, R.D.; Uy, O.M.; Farber, M.,
Experimental determination of heats of formation of negative ions and electron affinities of several boron and aluminum fluorides,
J. Chem. Soc. Faraday Trans. 1, 1974, 70, 1033. [all data]
Uy, Srivastava, et al., 1972
Uy, O.M.; Srivastava, R.D.; Farber, M.,
Mass spectrometric determination of the heats of formation of the gaseous molecules AlOF2 and AlF2,
High Temp. Sci., 1972, 4, 227. [all data]
Ehlert and Margrave, 1964
Ehlert, T.C.; Margrave, J.L.,
The heat of atomization of aluminum difluoride,
J. Am. Chem. Soc., 1964, 86, 3901. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
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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