Magnesium fluoride
- Formula: F2Mg
- Molecular weight: 62.3018
- 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. |
Gas phase ion energetics 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 evaluated as indicated in comments:
L - Sharon G. Lias
Data compiled as indicated in comments:
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 13.6 ± 0.3 | eV | N/A | N/A | L |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
13.3 ± 0.3 | EI | Hildenbrand, 1968 | RDSH |
14.0 ± 0.5 | EI | Murad, Hildenbrand, et al., 1966 | RDSH |
13.5 ± 0.4 | EI | Berkowitz and Marquart, 1962 | RDSH |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
MgF+ | 13.5 ± 1.0 | F | EI | Hildenbrand, 1968 | RDSH |
MgF+ | 13.7 ± 0.4 | F | EI | Ehlert, Blue, et al., 1964 | RDSH |
MgF+ | 13.5 ± 0.4 | F | EI | Berkowitz and Marquart, 1962 | RDSH |
IR Spectrum
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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: Coblentz Society, Inc.
Condensed Phase Spectrum
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Notice: Except where noted, spectra from this collection were measured on dispersive instruments, often in carefully selected solvents, and hence may differ in detail from measurements on FTIR instruments or in other chemical environments. More information on the manner in which spectra in this collection were collected can be found here.
Notice: Concentration information is not available for this spectrum and, therefore, molar absorptivity values cannot be derived.
Additional Data
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Owner | COBLENTZ SOCIETY Collection (C) 2018 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
---|---|
Origin | WYANDOTTE CHEMICALS CORP., WYANDOTTE, MICHIGAN, USA |
Source reference | COBLENTZ NO. 1428 |
Date | Not specified, most likely prior to 1970 |
Name(s) | difluoromagnesium |
State | SOLID (MINERAL OIL MULL) |
Instrument | Not specified, most likely a prism, grating, or hybrid spectrometer. |
Path length | SPECTRAL CONTAMINATION DUE TO OIL AROUND 2900, 1450, 1380 CM-1 |
Resolution | 4 |
Sampling procedure | TRANSMISSION |
Data processing | DIGITIZED BY NIST FROM HARD COPY |
Vibrational and/or electronic energy levels
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics data, IR Spectrum, NIST Free Links, 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: 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, Gas phase ion energetics data, IR Spectrum, Vibrational and/or electronic energy levels, NIST Free Links, 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]
Hildenbrand, 1968
Hildenbrand, D.L.,
Mass-spectrometric studies of bonding in the group IIA fluorides,
J. Chem. Phys., 1968, 48, 3657. [all data]
Murad, Hildenbrand, et al., 1966
Murad, E.; Hildenbrand, D.L.; Main, R.P.,
Dissociation energies of group IIIA monofluorides-the possibility of potential maxima in their excited H states,,
J. Chem. Phys., 1966, 45, 263. [all data]
Ehlert, Blue, et al., 1964
Ehlert, T.C.; Blue, G.D.; Green, J.W.; Margrave, J.L.,
Mass spectrometric studies at high temperatures. IV. Dissociation energies of the alkaline earth monofluorides,
J. Chem. Phys., 1964, 41, 2250. [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
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- Symbols used in this document:
AE Appearance energy IE (evaluated) Recommended ionization energy 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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