magnesium bromide

Formula: Br₂Mg
Molecular weight: 184.113
CAS Registry Number: 7789-48-2
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Other data available:
- Gas phase thermochemistry data
- Condensed phase thermochemistry data
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Reaction thermochemistry data

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Data compiled by: José A. Martinho Simões

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Individual Reactions

(g) + CH₃BrMg (solution) = (solution) + Br₂Mg (solution)

By formula: HBr (g) + CH₃BrMg (solution) = CH₄ (solution) + Br₂Mg (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-274.5 ± 2.2	kJ/mol	RSC	Holm, 1981	solvent: Diethyl ether; The enthalpy of formation was calculated using the assumptions and the auxiliary data in Holm, 1981, except for the organic compound, whose enthalpy of formation was quoted from Pedley, 1994

(g) + C₂H₃BrMg (solution) = (solution) + Br₂Mg (solution)

By formula: HBr (g) + C₂H₃BrMg (solution) = C₂H₄ (solution) + Br₂Mg (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-294.1 ± 2.2	kJ/mol	RSC	Holm, 1981	solvent: Tetrahydrofuran

C₄H₉BrMg (solution) + (g) = (solution) + Br₂Mg (solution)

By formula: C₄H₉BrMg (solution) + HBr (g) = C₄H₁₀ (solution) + Br₂Mg (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-292.5 ± 2.2	kJ/mol	RSC	Holm, 1981	solvent: Diethyl ether

C₄H₉BrMg (solution) + (g) = (solution) + Br₂Mg (solution)

By formula: C₄H₉BrMg (solution) + HBr (g) = C₄H₁₀ (solution) + Br₂Mg (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-305.9 ± 2.2	kJ/mol	RSC	Holm, 1981	solvent: Diethyl ether

C₅H₁₁BrMg (solution) + (g) = (solution) + Br₂Mg (solution)

By formula: C₅H₁₁BrMg (solution) + HBr (g) = C₅H₁₂ (solution) + Br₂Mg (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-306.3 ± 2.2	kJ/mol	RSC	Holm, 1981	solvent: Diethyl ether

C₁₉H₁₅BrMg (solution) + (g) = (solution) + Br₂Mg (solution)

By formula: C₁₉H₁₅BrMg (solution) + HBr (g) = C₁₉H₁₆ (solution) + Br₂Mg (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-231.0 ± 2.2	kJ/mol	RSC	Holm, 1981	solvent: Diethyl ether

C₃H₇BrMg (solution) + (g) = (solution) + Br₂Mg (solution)

By formula: C₃H₇BrMg (solution) + HBr (g) = C₃H₈ (solution) + Br₂Mg (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-305.9 ± 2.2	kJ/mol	RSC	Holm, 1981	solvent: Diethyl ether

(g) + C₂H₅BrMg (solution) = (solution) + Br₂Mg (solution)

By formula: HBr (g) + C₂H₅BrMg (solution) = C₂H₆ (solution) + Br₂Mg (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-299.2 ± 2.2	kJ/mol	RSC	Holm, 1981	solvent: Diethyl ether

C₁₀H₂₂Mg (cr) + (g) + (l) = 2 (l) + Br₂Mg (cr)

By formula: C₁₀H₂₂Mg (cr) + H₂ (g) + Br₂ (l) = 2C₅H₁₂ (l) + Br₂Mg (cr)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-669.6 ± 6.6	kJ/mol	RSC	Akkerman, Schat, et al., 1983

Gas phase ion energetics data

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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

Ionization energy determinations

IE (eV)	Method	Reference	Comment
10.47	PE	Lee and Potts, 1979	LLK
10.65 ± 0.15	EI	Berkowitz and Marquart, 1962	RDSH
10.85 ± 0.03	PE	Lee and Potts, 1979	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
Br⁺	16. ± 1.	?	EI	Berkowitz and Marquart, 1962	RDSH
MgBr⁺	12.0 ± 0.4	Br	EI	Berkowitz and Marquart, 1962	RDSH
Br₂⁺	17. ± 1.	Mg	EI	Berkowitz and Marquart, 1962	RDSH
Mg⁺	16. ± 1.	?	EI	Berkowitz and Marquart, 1962	RDSH

References

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Holm, 1981
Holm, T., J. Chem. Soc., Perkin Trans. II, 1981, 464.. [all data]

Pedley, 1994
Pedley, J.B., Thermodynamic Data and Structures of Organic Compounds; Thermodynamics Research Center Data Series, Vol I, Thermodynamics Research Center, College Station, 1994. [all data]

Akkerman, Schat, et al., 1983
Akkerman, O.S.; Schat, G.; Evers, E.A.I.M.; Bickelhaupt, F., Recl. Trav. Chim. Pays-Bas, 1983, 102, 109. [all data]

Lee and Potts, 1979
Lee, E.P.F.; Potts, A.W., An investigation of the valence shell electronic structure of alkaline earth halides by using Ab initio S. C. F. calculations and photoelectron spectroscopy, Proc. R. Soc. London A:, 1979, 365, 395. [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]

Notes

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Symbols used in this document:

AE Appearance energy

Δ_rH° Enthalpy of reaction at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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AE	Appearance energy
Δ_rH°	Enthalpy of reaction at standard conditions