Magnesium fluoride
- Formula: F2Mg
- Molecular weight: 62.3018
- IUPAC Standard InChI: InChI=1S/2FH.Mg/h2*1H;/q;;+2/p-2
- IUPAC Standard InChIKey: ORUIBWPALBXDOA-UHFFFAOYSA-L
- CAS Registry Number: 7783-40-6
- Chemical structure:
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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 | -173.70 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1975 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 61.288 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1975 |
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) | 3000. to 6000. |
|---|---|
| A | 13.31510 |
| B | 0.498786 |
| C | -0.133767 |
| D | 0.011342 |
| E | -0.177891 |
| F | -178.2870 |
| G | 76.25820 |
| H | -173.7000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1975 |
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.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -256.300 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1975 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 21.49 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1975 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -268.69 ± 0.29 | kcal/mol | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
| ΔfH°solid | -268.700 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1975 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid,1 bar | 13.7 ± 0.1 | cal/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 13.66 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1975 |
Liquid 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) | 1536. to 3000. |
|---|---|
| A | 22.68690 |
| B | -1.267321×10-8 |
| C | 5.082560×10-9 |
| D | -6.946270×10-10 |
| E | -3.103500×10-9 |
| F | -266.4491 |
| G | 42.60141 |
| H | -256.2990 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1975 |
Solid 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 1536. |
|---|---|
| A | 16.38420 |
| B | 5.431611 |
| C | -2.906831 |
| D | 0.615133 |
| E | -0.272673 |
| F | -274.7239 |
| G | 30.46181 |
| H | -268.7000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1975 |
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
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔsubH° | 83.2 ± 1.0 | kcal/mol | N/A | Greenbaum, Ko, et al., 1964 |
Enthalpy of sublimation
| ΔsubH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 78.2 ± 1.0 | 1400. | TE | Greenbaum, Ko, et al., 1964 | Based on data from 1273. to 1513. K. |
| 85.99 | 1330. | MS | Berkowitz and Marquart, 1962 | Based on data from 1220. to 1450. K. |
Vibrational and/or electronic energy levels
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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: Marilyn E. Jacox
State: X
| Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
|---|---|---|---|---|---|---|---|
| Πu | 2 | Bend | 254 | w m | Ne | IR | Snelson, 1966 |
| 2 | Bend | 243 | w m | Ar | IR | Snelson, 1966 | |
| 2 | Bend | 238 | w m | Kr | IR | Snelson, 1966 | |
| Σu+ | 3 | Asym. stretch | 862 | s | Ne | IR | Snelson, 1966 |
| 3 | Asym. stretch | 840 | s | Ar | IR | Snelson, 1966 | |
| 3 | Asym. stretch | 834 | m | Kr | IR | Snelson, 1966 | |
Additional references: Jacox, 1994, page 84; Buchler, Stauffer, et al., 1964
Notes
| w | Weak |
| m | Medium |
| s | Strong |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Vibrational and/or electronic energy levels, 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]
Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A.,
CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]
Greenbaum, Ko, et al., 1964
Greenbaum, Michael A.; Ko, Hon Chung; Wong, Madeline; Farber, Milton,
The Vapor Pressure and Heat and Entropy of Sublimation of Solid Magnesium Fluoride,
J. Phys. Chem., 1964, 68, 4, 965-968, https://doi.org/10.1021/j100786a510
. [all data]
Berkowitz and Marquart, 1962
Berkowitz, J.; Marquart, J.R.,
Mass-spectrometric study of the magnesium halides,
J. Chem. Phys., 1962, 37, 1853. [all data]
Snelson, 1966
Snelson, A.,
Infrared Spectra of Some Alkaline Earth Halides by the Matrix Isolation Technique,
J. Phys. Chem., 1966, 70, 10, 3208, https://doi.org/10.1021/j100882a031
. [all data]
Jacox, 1994
Jacox, M.E.,
Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]
Buchler, Stauffer, et al., 1964
Buchler, A.; Stauffer, J.L.; Klemperer, W.,
None,
J. Am. Chem. Soc., 1964, 86, 21, 4544, https://doi.org/10.1021/ja01075a007
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Vibrational and/or electronic energy levels, References
- Symbols used in this document:
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 S°solid,1 bar Entropy of solid at standard conditions (1 bar) 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 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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