Carbon tetrabromide

Formula: CBr₄
Molecular weight: 331.627
IUPAC Standard InChI: InChI=1S/CBr4/c2-1(3,4)5
IUPAC Standard InChIKey: HJUGFYREWKUQJT-UHFFFAOYSA-N
CAS Registry Number: 558-13-4
Chemical structure:
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Other names: Methane, tetrabromo-; Carbon bromide (CBr4); Methane tetrabromide; Tetrabromomethane; CBr4; Carbon bromide; Bromid uhlicity; UN 2516; NSC 6179
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Gas phase ion energetics data

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Data evaluated as indicated in comments:
L - Sharon G. Lias

Data compiled as indicated in comments:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
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

Quantity	Value	Units	Method	Reference	Comment
IE (evaluated)	10.31 ± 0.02	eV	N/A	N/A	L

Electron affinity determinations

EA (eV)	Method	Reference	Comment
2.0598	SI	Page and Goode, 1969	The Magnetron method, lacking mass analysis, is not considered reliable. G3MP2B3 calculations indicate an EA of ca. 1.4 eV.; B

Ionization energy determinations

IE (eV)	Method	Reference	Comment
10.3 ± 0.2	EI	Kime, Driscoll, et al., 1987	LBLHLM
10.8 ± 0.3	EI	Kaposi, Riedel, et al., 1976	LLK
10.31 ± 0.02	PI	Werner, Tsai, et al., 1974	LLK
10.54	PE	Dixon, Murrell, et al., 1971	Vertical value; LLK
10.39	PE	Potts, Lempka, et al., 1970	Vertical value; RDSH
10.40	PE	Green, Green, et al., 1970	Vertical value; RDSH

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
Br⁺	14.5 ± 0.5	?	EI	Kaposi, Riedel, et al., 1976	LLK
Br⁺	18.1 ± 0.2	?	EI	Thorburn, 1965	RDSH
Br₂⁺	17.2 ± 0.3	?	EI	Kaposi, Riedel, et al., 1976	LLK
Br₂⁺	13.3 ± 0.1	?	EI	DeCorpo and Franklin, 1971	LLK
C⁺	23.0 ± 0.5	?	EI	Kaposi, Riedel, et al., 1976	LLK
C⁺	23.1 ± 0.4	?	EI	Thorburn, 1965	RDSH
CBr⁺	19.3 ± 0.4	3Br	EI	Kaposi, Riedel, et al., 1976	LLK
CBr⁺	17.5 ± 0.2	?	EI	Thorburn, 1965	RDSH
CBr⁺	16.35 ± 0.13	?	EI	Reed and Snedden, 1958	RDSH
CBr₂⁺	14.5 ± 0.3	?	EI	Kaposi, Riedel, et al., 1976	LLK
CBr₂⁺	14.6 ± 0.3	?	EI	Thorburn, 1965	RDSH
CBr₂⁺	12.30 ± 0.08	?	EI	Reed and Snedden, 1958	RDSH
CBr₃⁺	11.4 ± 0.3	Br	EI	Kaposi, Riedel, et al., 1976	LLK
CBr₃⁺	10.47 ± 0.02	Br	PI	Werner, Tsai, et al., 1974	LLK
CBr₃⁺	11.3 ± 0.2	Br	EI	Thorburn, 1965	RDSH
CBr₃⁺	9.95 ± 0.05	Br	EI	Reed and Snedden, 1958	RDSH

References

Go To: Top, Gas phase ion energetics data, Notes

Page and Goode, 1969
Page, F.M.; Goode, G.C., Negative Ions and the Magnetron., Wiley, NY, 1969. [all data]

Kime, Driscoll, et al., 1987
Kime, Y.J.; Driscoll, D.C.; Dowben, P.A., The stability of the carbon tetrahalide ions, J. Chem. Soc. Faraday Trans. 2, 1987, 83, 403. [all data]

Kaposi, Riedel, et al., 1976
Kaposi, O.; Riedel, M.; Vass-Balthazar, K.; Sanchez, G.R.; Lelik, L., Mass-spectrometric determination of thermochemical data of CHBr₃ and CBr₄ by study of their electron impact and heterogeneous pyrolytic decompositions, Acta Chim. Acad. Sci. Hung., 1976, 89, 221. [all data]

Werner, Tsai, et al., 1974
Werner, A.S.; Tsai, B.P.; Baer, T., Photoionization study of the ionization potentials fragmentation paths of the chlorinated methanes carbon tetrabromide, J. Chem. Phys., 1974, 60, 3650. [all data]

Dixon, Murrell, et al., 1971
Dixon, R.N.; Murrell, J.N.; Narayan, B., The photoelectron spectra of the halomethanes, Mol. Phys., 1971, 20, 611. [all data]

Potts, Lempka, et al., 1970
Potts, A.W.; Lempka, H.J.; Streets, D.G.; Price, W.C., Photoelectron spectra of the halides of elements in groups III, IV, V and VI, Phil. Trans. Roy. Soc. (London), 1970, A268, 59. [all data]

Green, Green, et al., 1970
Green, J.C.; Green, M.L.H.; Joachim, P.J.; Orchard, A.F.; Turner, D.W., A study of the bonding in the group IV tetrahalides by photoelectron spectroscopy, Phil. Trans. Roy. Soc. (London), 1970, A268, III. [all data]

Thorburn, 1965
Thorburn, R., Ionization and dissociation by electron impact in carbon tetrabromide, Brit. J. Appl. Phys., 1965, 16, 1397. [all data]

DeCorpo and Franklin, 1971
DeCorpo, J.J.; Franklin, J.L., Electron affinities of the halogen molecules by dissociative electron attachment, J. Chem. Phys., 1971, 54, 1885. [all data]

Reed and Snedden, 1958
Reed, R.I.; Snedden, W., Studies in electron impact methods. Part 2. The latent heat of sublimation of carbon, J. Chem. Soc. Faraday Trans., 1958, 54, 301. [all data]

Notes

Go To: Top, Gas phase ion energetics data, References

Symbols used in this document:

AE Appearance energy

EA Electron affinity

IE (evaluated) Recommended ionization energy
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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AE	Appearance energy
EA	Electron affinity
IE (evaluated)	Recommended ionization energy