Benzene, 1,4-dibromo-
- Formula: C6H4Br2
- Molecular weight: 235.904
- IUPAC Standard InChIKey: SWJPEBQEEAHIGZ-UHFFFAOYSA-N
- CAS Registry Number: 106-37-6
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Benzene, p-dibromo-; p-Bromophenyl bromide; p-Dibromobenzene; 1,4-Dibromobenzene; Dibromobenzene
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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:
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
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 8.82 ± 0.03 | eV | N/A | N/A | L |
Quantity | Value | Units | Method | Reference | Comment |
ΔfH°(+) ion | 979. | kJ/mol | N/A | N/A | |
Quantity | Value | Units | Method | Reference | Comment |
ΔfH(+) ion,0K | 1000. | kJ/mol | N/A | N/A |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
8.82 ± 0.02 | PIPECO | Olesik, Baer, et al., 1986 | LBLHLM |
8.85 ± 0.02 | PI | Moini and Leroi, 1986 | LBLHLM |
8.8 | PE | Kimura, Katsumata, et al., 1981 | LLK |
8.9 ± 0.15 | CTS | Voigt and Reid, 1964 | RDSH |
8.90 | PE | Kimura, Katsumata, et al., 1981 | Vertical value; LLK |
8.909 | PE | Potts, Lyus, et al., 1980 | Vertical value; LLK |
8.90 ± 0.03 | PE | Cvitas and Klasinc, 1977 | Vertical value; LLK |
8.91 | PE | Streets and Ceasar, 1973 | Vertical value; LLK |
8.97 | PE | Baker, May, et al., 1968 | Vertical value; RDSH |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
C6H4+ | 12.3 ± 0.1 | Br2 | PI | Moini and Leroi, 1986 | LBLHLM |
C6H4Br+ | 12.17 ± 0.05 | Br | PI | Moini and Leroi, 1986 | LBLHLM |
Gas Chromatography
Go To: Top, Gas phase ion energetics 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 by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Kovats' RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Packed | SE-30 | 1193. | Ramsey, Lee, et al., 1980 | He, Chromosorb G HP (80-100 mesh); Column length: 1.5 m; Program: not specified |
Normal alkane RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | CP Sil 2 | 1190. | Fuhrer, Deissler, et al., 1997 | 55. m/0.25 mm/0.25 μm, N2; Program: 40C(3min) => 20C/min => 80C => 2C/min => 240C(45min) |
Capillary | OV-1, SE-30, Methyl silicone, SP-2100, OV-101, DB-1, etc. | 1193. | Waggott and Davies, 1984 | Hydrogen; Column length: 50. m; Column diameter: 0.32 mm; Program: not specified |
Other | Methyl Silicone | 1193. | Ardrey and Moffat, 1981 | Program: not specified |
References
Go To: Top, Gas phase ion energetics data, Gas Chromatography, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Olesik, Baer, et al., 1986
Olesik, S.; Baer, T.; Morrow, J.C.,
Dissociation rates of energy-selected dichloro- and dibromobenzene ions,
J. Phys. Chem., 1986, 90, 3563. [all data]
Moini and Leroi, 1986
Moini, M.; Leroi, G.E.,
Photoionization and fragmentation of o-, m- and p-dibromobenzene: Isomer scrambling and product thermochemistry,
J. Phys. Chem., 1986, 90, 4002. [all data]
Kimura, Katsumata, et al., 1981
Kimura, K.; Katsumata, S.; Achiba, Y.; Yamazaki, T.; Iwata, S.,
Ionization energies, Ab initio assignments, and valence electronic structure for 200 molecules
in Handbook of HeI Photoelectron Spectra of Fundamental Organic Compounds, Japan Scientific Soc. Press, Tokyo, 1981. [all data]
Voigt and Reid, 1964
Voigt, E.M.; Reid, C.,
Ionization potentials of substituted benzenes and their charge-transfer spectra with tetracyanoethylene,
J. Am. Chem. Soc., 1964, 86, 3930. [all data]
Potts, Lyus, et al., 1980
Potts, A.W.; Lyus, M.L.; Lee, E.P.F.; Fattahallah, G.H.,
High resolution ultraviolet photoelectron spectra of C6H5X and p-C6H4X2 where X = Cl, Br or I,
J. Chem. Soc. Faraday Trans. 2, 1980, 76, 556. [all data]
Cvitas and Klasinc, 1977
Cvitas, T.; Klasinc, L.,
Photoelectron spectra of bromobenzenes,
Croat. Chem. Acta., 1977, 50, 291. [all data]
Streets and Ceasar, 1973
Streets, D.G.; Ceasar, G.P.,
Inductive mesomeric effects on the π orbitals of halobenzenes,
Mol. Phys., 1973, 26, 1037. [all data]
Baker, May, et al., 1968
Baker, A.D.; May, D.P.; Turner, D.W.,
Molecular photoelectron spectroscopy. Part VII. The vertical ionisation potentials of benzene and some of its monosubstituted and 1,4-disubstituted derivatives,
J. Chem. Soc. B, 1968, 22. [all data]
Ramsey, Lee, et al., 1980
Ramsey, J.D.; Lee, T.D.; Osselton, M.D.; Moffat, A.C.,
Gas-liquid chromatographic retention indices of 296 non-drug substances on SE-30 or OV-1 likely to be encountered in toxicological analyses,
J. Chromatogr., 1980, 184, 2, 185-206, https://doi.org/10.1016/S0021-9673(00)85641-1
. [all data]
Fuhrer, Deissler, et al., 1997
Fuhrer, U.; Deissler, A.; Schreitmuller, J.; Ballschmiter, K.,
Analysis of Halogenated Methoxybenzenes and Hexachlorobenzene (HCB) in the Picogram m-3 Range in Marine Air,
Chromatographia, 1997, 45, 1, 414-427, https://doi.org/10.1007/BF02505594
. [all data]
Waggott and Davies, 1984
Waggott, A.; Davies, I.W.,
Identification of organic pollutants using linear temperature programmed retention indices (LTPRIs) - Part II, 1984, retrieved from http://dwi.defra.gov.uk/research/completed-research/reports/dwi0383.pdf. [all data]
Ardrey and Moffat, 1981
Ardrey, R.E.; Moffat, A.C.,
Gas-liquid chromatographic retention indices of 1318 substances of toxicological interest on SE-30 or OV-1 stationary phase,
J. Chromatogr., 1981, 220, 3, 195-252, https://doi.org/10.1016/S0021-9673(00)81925-1
. [all data]
Notes
Go To: Top, Gas phase ion energetics data, Gas Chromatography, References
- Symbols used in this document:
AE Appearance energy IE (evaluated) Recommended ionization energy ΔfH(+) ion,0K Enthalpy of formation of positive ion at 0K - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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