Benzene, 1-bromo-2-methyl-
- Formula: C7H7Br
- Molecular weight: 171.034
- IUPAC Standard InChIKey: QSSXJPIWXQTSIX-UHFFFAOYSA-N
- CAS Registry Number: 95-46-5
- 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: Toluene, o-bromo-; o-Bromotoluene; o-Tolyl bromide; 1-Bromo-2-methylbenzene; 2-Bromotoluene; 2-Methylbromobenzene; 2-Tolyl bromide; o-Methylphenyl bromide; 1-Methyl-2-bromobenzene; 2-Bromo-1-methylbenzene; NSC 6532
- Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Options:
Phase change data
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, NIST Free Links, NIST Subscription 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 as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 454.6 ± 0.4 | K | AVG | N/A | Average of 9 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 245.4 | K | N/A | Dreisbach, 1955 | Uncertainty assigned by TRC = 0.02 K; TRC |
Tfus | 246.34 | K | N/A | Clements, Wise, et al., 1953 | Uncertainty assigned by TRC = 0.06 K; TRC |
Tfus | 246.55 | K | N/A | Hussey and Dyer, 1951 | Uncertainty assigned by TRC = 1. K; TRC |
Tfus | 245.05 | K | N/A | Timmermans, 1921 | Uncertainty assigned by TRC = 0.15 K; TRC |
Reduced pressure boiling point
Tboil (K) | Pressure (bar) | Reference | Comment |
---|---|---|---|
332.2 | 0.013 | Weast and Grasselli, 1989 | BS |
Enthalpy of vaporization
ΔvapH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
47.2 | 337. | N/A | Dykyj, Svoboda, et al., 1999 | Based on data from 322. to 455. K.; AC |
45.3 | 368. | A | Stephenson and Malanowski, 1987 | Based on data from 353. to 518. K. See also Dykyj and Vanko, 1970 and Kkykj and Repas, 1973.; AC |
52.6 | 312. | N/A | Stull, 1947 | Based on data from 297. to 455. K.; AC |
48.8 | 288. | N/A | Stuckey and Saylor, 1940 | Based on data from 273. to 348. K.; AC |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
297.6 to 455.0 | 3.91296 | 1440.879 | -85.87 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
Reaction thermochemistry data
Go To: Top, Phase change data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, NIST Free Links, NIST Subscription 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: John E. Bartmess
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
C7H6Br- + =
By formula: C7H6Br- + H+ = C7H7Br
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 1563. ± 13. | kJ/mol | G+TS | Wenthold, Wierschke, et al., 1994 | gas phase; Between MeOCH2CH2OH and tBuCH2OH, near CH2Cl2 |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 1533. ± 13. | kJ/mol | IMRB | Wenthold, Wierschke, et al., 1994 | gas phase; Between MeOCH2CH2OH and tBuCH2OH, near CH2Cl2 |
Gas phase ion energetics data
Go To: Top, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, NIST Free Links, NIST Subscription Links, References, Notes
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:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias
Data compiled as indicated in comments:
B - John E. Bartmess
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) | 8.56 ± 0.03 | eV | N/A | N/A | L |
Quantity | Value | Units | Method | Reference | Comment |
Proton affinity (review) | 775.3 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
Quantity | Value | Units | Method | Reference | Comment |
Gas basicity | 745.8 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
8.53 | PE | Baidin, Misharev, et al., 1985 | LBLHLM |
8.6 ± 0.1 | EI | Tajima and Tsuchiya, 1972 | LLK |
8.78 ± 0.01 | PI | Watanabe, 1957 | RDSH |
8.85 | PE | Baidin, Misharev, et al., 1985 | Vertical value; LBLHLM |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
C5H5+ | 15.2 ± 0.2 | C2H2+Br | EI | Tajima and Tsuchiya, 1973 | LLK |
C5H5+ | 15.19 ± 0.15 | ? | EI | Tajima and Tsuchiya, 1972 | LLK |
C7H7+ | 11.1 ± 0.1 | ? | EI | Tajima and Tsuchiya, 1972 | LLK |
C7H7+ | 11.2 | Br | EI | Yeo and Williams, 1970 | RDSH |
De-protonation reactions
C7H6Br- + =
By formula: C7H6Br- + H+ = C7H7Br
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 1563. ± 13. | kJ/mol | G+TS | Wenthold, Wierschke, et al., 1994 | gas phase; Between MeOCH2CH2OH and tBuCH2OH, near CH2Cl2; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 1533. ± 13. | kJ/mol | IMRB | Wenthold, Wierschke, et al., 1994 | gas phase; Between MeOCH2CH2OH and tBuCH2OH, near CH2Cl2; B |
IR Spectrum
Go To: Top, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Mass spectrum (electron ionization), Gas Chromatography, NIST Free Links, NIST Subscription Links, References, Notes
Data compiled by: Coblentz Society, Inc.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Mass spectrum (electron ionization)
Go To: Top, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Gas Chromatography, NIST Free Links, NIST Subscription 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: NIST Mass Spectrometry Data Center, William E. Wallace, director
Spectrum
Notice: This spectrum may be better viewed with a Javascript and HTML 5 enabled browser.
Additional Data
View image of digitized spectrum (can be printed in landscape orientation).
Due to licensing restrictions, this spectrum cannot be downloaded.
Owner | NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
---|---|
Origin | NIST Mass Spectrometry Data Center, 1998. |
NIST MS number | 291336 |
Gas Chromatography
Go To: Top, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), NIST Free Links, NIST Subscription 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: NIST Mass Spectrometry Data Center, William E. Wallace, director
Kovats' RI, non-polar column, isothermal
Column type | Active phase | Temperature (C) | I | Reference | Comment |
---|---|---|---|---|---|
Capillary | DB-5 | 110. | 1053.73 | Gerbino, Garbarino, et al., 1996 | 30. m/0.53 mm/1.5 μm, N2 |
Capillary | DB-5 | 70. | 1032.58 | Gerbino, Garbarino, et al., 1996 | 30. m/0.53 mm/1.5 μm, N2 |
Capillary | DB-5 | 90. | 1042.66 | Gerbino, Garbarino, et al., 1996 | 30. m/0.53 mm/1.5 μm, N2 |
Van Den Dool and Kratz RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | OV-1 | 1016.9 | Gautzsch and Zinn, 1996 | 8. K/min; Tstart: 35. C; Tend: 300. C |
Capillary | DB-5 | 1022.72 | Gerbino, Garbarino, et al., 1996 | 30. m/0.53 mm/1.5 μm, N2, 2. K/min; Tstart: 50. C |
Capillary | DB-5 | 1027.31 | Gerbino, Garbarino, et al., 1996 | 30. m/0.53 mm/1.5 μm, N2, 2. K/min; Tstart: 50. C |
Capillary | DB-5 | 1031.98 | Gerbino, Garbarino, et al., 1996 | 30. m/0.53 mm/1.5 μm, N2, 2. K/min; Tstart: 50. C |
Capillary | DB-1 | 1033. | Gerbino and Castello, 1995 | 30. m/0.235 mm/0.25 μm, N2, 100. C @ 0. min, 10. K/min |
Capillary | DB-1 | 1029. | Gerbino and Castello, 1995 | 30. m/0.235 mm/0.25 μm, N2, 100. C @ 0. min, 5. K/min |
Capillary | DB-1 | 1020. | Gerbino and Castello, 1995 | 30. m/0.235 mm/0.25 μm, N2, 50. C @ 0. min, 10. K/min |
Capillary | DB-1 | 1012. | Gerbino and Castello, 1995 | 30. m/0.235 mm/0.25 μm, N2, 50. C @ 0. min, 5. K/min |
Packed | SE-30 | 1037. | Buchman, Cao, et al., 1984 | He, Chromosorb AW, 40. C @ 10. min, 10. K/min, 210. C @ 30. min; Column length: 3.05 m |
Van Den Dool and Kratz RI, polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-Wax | 1432.76 | Gerbino and Castello, 1995 | 30. m/0.235 mm/0.5 μm, N2, 10. K/min; Tstart: 100. C |
Capillary | DB-Wax | 1431.71 | Gerbino and Castello, 1995 | 30. m/0.235 mm/0.5 μm, N2, 5. K/min; Tstart: 100. C |
Capillary | DB-Wax | 1449.23 | Gerbino and Castello, 1995 | 30. m/0.235 mm/0.5 μm, N2, 10. K/min; Tstart: 50. C |
Capillary | DB-Wax | 1437.45 | Gerbino and Castello, 1995 | 30. m/0.235 mm/0.5 μm, N2, 5. K/min; Tstart: 50. C |
Packed | Carbowax 20M | 1483. | Buchman, Cao, et al., 1984 | He, Supelcoport, 40. C @ 10. min, 10. K/min, 210. C @ 30. min; Column length: 3.05 m |
Normal alkane RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | OV-1, SE-30, Methyl silicone, SP-2100, OV-101, DB-1, etc. | 1037. | Waggott and Davies, 1984 | Hydrogen; Column length: 50. m; Column diameter: 0.32 mm; Program: not specified |
Lee's RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | HP5-MS | 171. | Vrana, Paschke, et al., 2005 | 30. m/0.25 mm/0.25 μm, Helium, 50. C @ 5. min, 5. K/min, 280. C @ 10. min |
References
Go To: Top, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, NIST Free Links, NIST Subscription Links, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Dreisbach, 1955
Dreisbach, R.R.,
Physical Properties of Chemical Compounds, Advances in Chemistry Series No. 15, Am. Chem. Soc.: Washington, D. C., 1955. [all data]
Clements, Wise, et al., 1953
Clements, H.E.; Wise, K.V.; Johnson, S.E.J.,
Physical Properties of o-, m-, and p-Methylstyrene,
J. Am. Chem. Soc., 1953, 75, 1593. [all data]
Hussey and Dyer, 1951
Hussey, A.S.; Dyer, J.R.,
The Monomagnesium Derivatives of Dibromotoluenes,
J. Am. Chem. Soc., 1951, 73, 603. [all data]
Timmermans, 1921
Timmermans, J.,
The Freezing Points of Organic Substances IV. New Exp. Determinations,
Bull. Soc. Chim. Belg., 1921, 30, 62. [all data]
Weast and Grasselli, 1989
CRC Handbook of Data on Organic Compounds, 2nd Editon, Weast,R.C and Grasselli, J.G., ed(s)., CRC Press, Inc., Boca Raton, FL, 1989, 1. [all data]
Dykyj, Svoboda, et al., 1999
Dykyj, J.; Svoboda, J.; Wilhoit, R.C.; Frenkel, M.L.; Hall, K.R.,
Vapor Pressure of Chemicals: Part A. Vapor Pressure and Antoine Constants for Hydrocarbons and Sulfur, Selenium, Tellurium and Hydrogen Containing Organic Compounds, Springer, Berlin, 1999, 373. [all data]
Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw,
Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2
. [all data]
Dykyj and Vanko, 1970
Dykyj, J.; Vanko, A.,
Petrochemica, 1970, 10, 1, 3. [all data]
Kkykj and Repas, 1973
Kkykj, J.; Repas, M.,
Petrochemia, 1973, 13, 179. [all data]
Stull, 1947
Stull, Daniel R.,
Vapor Pressure of Pure Substances. Organic and Inorganic Compounds,
Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022
. [all data]
Stuckey and Saylor, 1940
Stuckey, James M.; Saylor, John H.,
The Vapor Pressures of Some Organic Compounds. I. 1,
J. Am. Chem. Soc., 1940, 62, 11, 2922-2925, https://doi.org/10.1021/ja01868a011
. [all data]
Wenthold, Wierschke, et al., 1994
Wenthold, P.G.; Wierschke, S.G.; Nash, J.J.; Squires, R.R.,
Biradical thermochemistry from collision-induced dissociation threshold energy measurements .2. Experimental and theoretical studies of the Mechanism and Thermochemistry of Formation of alph,
J. Am. Chem. Soc., 1994, 116, 16, 7378, https://doi.org/10.1021/ja00095a048
. [all data]
Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G.,
Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update,
J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018
. [all data]
Baidin, Misharev, et al., 1985
Baidin, V.N.; Misharev, A.D.; Takhistov, V.V.,
Effect of alkyl substituents on the ionization potentials of halogenobenzenes,
Zh. Org. Khim., 1985, 21, 817. [all data]
Tajima and Tsuchiya, 1972
Tajima, S.; Tsuchiya, T.,
The effects of the repeller voltage and the shield voltage on appearance potential measurements by electron impact,
Shitsuryo Bunseki, 1972, 20, 117. [all data]
Watanabe, 1957
Watanabe, K.,
Ionization potentials of some molecules,
J. Chem. Phys., 1957, 26, 542. [all data]
Tajima and Tsuchiya, 1973
Tajima, S.; Tsuchiya, T.,
Energetics consideration of C5H5+ ions produced from various precursors by electron impact,
Bull. Chem. Soc. Jpn., 1973, 46, 3291. [all data]
Yeo and Williams, 1970
Yeo, A.N.H.; Williams, D.H.,
Rearrangement in the molecular ions of halogenotoluenes prior to fragmentation in the mass spectrometer,
Chem. Commun., 1970, 886. [all data]
Gerbino, Garbarino, et al., 1996
Gerbino, T.C.; Garbarino, G.; Petit-Bon, P.,
Programmed temperature retention indices: calculation of linear programmed temperature retention indices of halogenated benzenes from isothermal data,
Ann. Chim. (Rome), 1996, 86, 63-75. [all data]
Gautzsch and Zinn, 1996
Gautzsch, R.; Zinn, P.,
Use of incremental models to estimate the retention indexes of aromatic compounds,
Chromatographia, 1996, 43, 3/4, 163-176, https://doi.org/10.1007/BF02292946
. [all data]
Gerbino and Castello, 1995
Gerbino, T.C.; Castello, G.,
Prediction of programmed temperature retention indices on capillary columns of different polarities,
J. Chromatogr. A, 1995, 699, 1-2, 161-171, https://doi.org/10.1016/0021-9673(95)00024-H
. [all data]
Buchman, Cao, et al., 1984
Buchman, O.; Cao, G.-Y.; Peng, C.T.,
Structure assignment by retention index in gas-liquid radiochromatography of substituted cyclohexenes,
J. Chromatogr., 1984, 312, 75-90, https://doi.org/10.1016/S0021-9673(01)92765-7
. [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]
Vrana, Paschke, et al., 2005
Vrana, B.; Paschke, H.; Paschke, A.; Popp, P.; Schuurmann, G.,
Performance of semipermeable membrane devices for sampling of organic contaminants in groun water,
J. Envirom. Monit., 2005, 7, 5, 500-508, https://doi.org/10.1039/b411645c
. [all data]
Notes
Go To: Top, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, NIST Free Links, NIST Subscription Links, References
- Symbols used in this document:
AE Appearance energy IE (evaluated) Recommended ionization energy Tboil Boiling point Tfus Fusion (melting) point ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions ΔvapH Enthalpy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
- The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
- Customer support for NIST Standard Reference Data products.