Benzene, 1,2-difluoro-

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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 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
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Tboil365.2KN/AAldrich Chemical Company Inc., 1990BS
Tboil364. to 365.KN/APCR Inc., 1990BS
Tboil367.1KN/AMajer and Svoboda, 1985 
Quantity Value Units Method Reference Comment
Ttriple226.010KN/AScott, Messerly, et al., 1963Uncertainty assigned by TRC = 0.01 K; TRC
Quantity Value Units Method Reference Comment
Tc557.3KN/AMajer and Svoboda, 1985 
Quantity Value Units Method Reference Comment
Δvap8.662kcal/molN/AMajer and Svoboda, 1985 
Δvap8.65kcal/molN/ABoublik, Fried, et al., 1984Based on data from 300. to 400. K. See also Basarová and Svoboda, 1991.; AC
Δvap8.65kcal/molVScott, Messerly, et al., 1963, 2hfusion=2.64kcal/mol; ALS
Δvap8.65 ± 0.02kcal/molVGood, Lacina, et al., 1962Corrected for CODATA value of ΔfH; ALS

Reduced pressure boiling point

Tboil (K) Pressure (atm) Reference Comment
364.70.988Weast and Grasselli, 1989BS

Enthalpy of vaporization

ΔvapH (kcal/mol) Temperature (K) Method Reference Comment
7.698367.1N/AMajer and Svoboda, 1985 
8.48319.EBScott, Messerly, et al., 1963, 2Based on data from 304. to 403. K. See also Boublik, Fried, et al., 1984.; AC
8.27 ± 0.02327.CScott, Messerly, et al., 1963, 2AC
8.01 ± 0.02345.CScott, Messerly, et al., 1963, 2AC
7.70 ± 0.02367.CScott, Messerly, et al., 1963, 2AC

Enthalpy of vaporization

ΔvapH = A exp(-βTr) (1 − Tr)β
    ΔvapH = Enthalpy of vaporization (at saturation pressure) (kcal/mol)
    Tr = reduced temperature (T / Tc)

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Temperature (K) A (kcal/mol) β Tc (K) Reference Comment
298. to 367.12.270.2691557.3Majer and Svoboda, 1985 

Antoine Equation Parameters

log10(P) = A − (B / (T + C))
    P = vapor pressure (atm)
    T = temperature (K)

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Temperature (K) A B C Reference Comment
304.31 to 403.404.139501310.271-50.563Scott, Messerly, et al., 1963, 3Coefficents calculated by NIST from author's data.

Enthalpy of fusion

ΔfusH (kcal/mol) Temperature (K) Reference Comment
2.6401226.01Scott, Messerly, et al., 1963, 3DH
2.641226.Domalski and Hearing, 1996AC

Entropy of fusion

ΔfusS (cal/mol*K) Temperature (K) Reference Comment
11.68226.01Scott, Messerly, et al., 1963, 3DH

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


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:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
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)9.29 ± 0.01eVN/AN/AL
Quantity Value Units Method Reference Comment
Proton affinity (review)174.8kcal/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity168.1kcal/molN/AHunter and Lias, 1998HL

Ionization energy determinations

IE (eV) Method Reference Comment
9.284 ± 0.008EQLias and Ausloos, 1978LLK
9.30SGilbert and Sandorfy, 1974LLK
9.74 ± 0.02EIMomigny and Wirtz-Cordier, 1962RDSH
9.31PIBralsford, Harris, et al., 1960RDSH
9.30PEStreets and Ceasar, 1973Vertical value; LLK
9.6 ± 0.03PEKlessinger, 1972Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
C4H2F2+15.27C2H2EIMomigny and Wirtz-Cordier, 1962RDSH

De-protonation reactions

C6H3F2- + Hydrogen cation = Benzene, 1,2-difluoro-

By formula: C6H3F2- + H+ = C6H4F2

Quantity Value Units Method Reference Comment
Δr377.7 ± 2.2kcal/molG+TSBuker, Nibbering, et al., 1997gas phase; B
Δr378.0 ± 3.1kcal/molG+TSBriscese and Riveros, 1975gas phase; Between EtO-, iPrO-; value altered from reference due to change in acidity scale; B
Quantity Value Units Method Reference Comment
Δr369.5 ± 2.0kcal/molIMREBuker, Nibbering, et al., 1997gas phase; B
Δr369.8 ± 3.0kcal/molIMRBBriscese and Riveros, 1975gas phase; Between EtO-, iPrO-; value altered from reference due to change in acidity scale; B

Gas Chromatography

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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: NIST Mass Spectrometry Data Center, William E. Wallace, director

Van Den Dool and Kratz RI, non-polar column, temperature ramp

View large format table.

Column type Active phase I Reference Comment
CapillaryOV-1674.4Gautzsch and Zinn, 19968. K/min; Tstart: 35. C; Tend: 300. C
PackedSE-30681.Peng, Ding, et al., 1988He, Supelcoport and Chromosorb, 40. C @ 4. min, 10. K/min, 250. C @ 60. min; Column length: 3.05 m

Normal alkane RI, non-polar column, temperature ramp

View large format table.

Column type Active phase I Reference Comment
CapillaryOV-101675.Zenkevich, 200525. m/0.20 mm/0.10 μm, N2/He, 6. K/min; Tstart: 50. C; Tend: 250. C

References

Go To: Top, Phase change data, 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.

Aldrich Chemical Company Inc., 1990
Aldrich Chemical Company Inc., Catalog Handbook of Fine Chemicals, Aldrich Chemical Company, Inc., Milwaukee WI, 1990, 1. [all data]

PCR Inc., 1990
PCR Inc., Research Chemicals Catalog 1990-1991, PCR Inc., Gainesville, FL, 1990, 1. [all data]

Majer and Svoboda, 1985
Majer, V.; Svoboda, V., Enthalpies of Vaporization of Organic Compounds: A Critical Review and Data Compilation, Blackwell Scientific Publications, Oxford, 1985, 300. [all data]

Scott, Messerly, et al., 1963
Scott, D.W.; Messerly, J.F.; Todd, S.S.; Hossenlopp, I.A.; Osborn, A.G.; McCullough, J.P., 1,2-difluorobenzene: chemical thermodynamic properties and vibrational assignment, J. Chem. Phys., 1963, 38, 532-9. [all data]

Boublik, Fried, et al., 1984
Boublik, T.; Fried, V.; Hala, E., The Vapour Pressures of Pure Substances: Selected Values of the Temperature Dependence of the Vapour Pressures of Some Pure Substances in the Normal and Low Pressure Region, 2nd ed., Elsevier, New York, 1984, 972. [all data]

Basarová and Svoboda, 1991
Basarová, Pavlína; Svoboda, Václav, Calculation of heats of vaporization of halogenated hydrocarbons from saturated vapour pressure data, Fluid Phase Equilibria, 1991, 68, 13-34, https://doi.org/10.1016/0378-3812(91)85008-I . [all data]

Scott, Messerly, et al., 1963, 2
Scott, D.W.; Messerly, J.F.; Todd, S.S.; Hossenlopp, I.A.; Osborn, A.; McCullough, J.P., 1,2-Difluorobenzene: Chemical thermodynamic properties and vibrationnal assignment, J. Chem. Phys., 1963, 38, 532. [all data]

Good, Lacina, et al., 1962
Good, W.D.; Lacina, J.L.; Scott, D.W.; McCullough, J.P., Combustion calorimetry of organic fluorine compounds. The heats of combustion and formation of the difluorobenzenes, 4-fluorotoluene and m-trifluorotoluic acid, J. Phys. Chem., 1962, 66, 1529-1532. [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]

Scott, Messerly, et al., 1963, 3
Scott, D.W.; Messerly, J.F.; Todd, S.S.; Hossenlopp, I.A.; Osborn, A.; McCullough, J.P., 1,2-Difluorobenzene: Chemical thermodynamic properties and vibrational assignment, J. Chem. Phys., 1963, 38, 532-539. [all data]

Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D., Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III, J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985 . [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]

Lias and Ausloos, 1978
Lias, S.G.; Ausloos, P.J., eIonization energies of organic compounds by equilibrium measurements, J. Am. Chem. Soc., 1978, 100, 6027. [all data]

Gilbert and Sandorfy, 1974
Gilbert, R.; Sandorfy, C., Rydberg transitions in the ultraviolet spectra of difluorobenzenes, Chem. Phys. Lett., 1974, 27, 457. [all data]

Momigny and Wirtz-Cordier, 1962
Momigny, J.; Wirtz-Cordier, A.M., Les effets de l'impact electronique sur des derives dihalogenes du benzene, Ann. Soc. Sci. Bruxelles, 1962, 76, 164. [all data]

Bralsford, Harris, et al., 1960
Bralsford, R.; Harris, P.V.; Price, W.C., The effect of fluorine on the electronic spectra and ionization potentials of molecules, Proc. Roy. Soc. (London), 1960, A258, 459. [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]

Klessinger, 1972
Klessinger, M., Ionization potentials of substituted benzenes, Angew. Chem. Int. Ed. Engl., 1972, 11, 525. [all data]

Buker, Nibbering, et al., 1997
Buker, H.H.; Nibbering, N.M.M.; Espinosa, D.; Mongin, F.; Schlosser, M., Additivity of substituent effects in the fluoroarene series: Equilibrium acidity in the gas phase and deprotonation rates in ethereal solution, Tetrahed. Lett., 1997, 38, 49, 8519-8522, https://doi.org/10.1016/S0040-4039(97)10303-3 . [all data]

Briscese and Riveros, 1975
Briscese, S.M.J.; Riveros, J.M., Gas phase nucleophilic reactions of aromatic systems, J. Am. Chem. Soc., 1975, 97, 230. [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]

Peng, Ding, et al., 1988
Peng, C.T.; Ding, S.F.; Hua, R.L.; Yang, Z.C., Prediction of Retention Indexes I. Structure-Retention Index Relationship on Apolar Columns, J. Chromatogr., 1988, 436, 137-172, https://doi.org/10.1016/S0021-9673(00)94575-8 . [all data]

Zenkevich, 2005
Zenkevich, I.G., Experimentally measured retention indices., 2005. [all data]


Notes

Go To: Top, Phase change data, Gas phase ion energetics data, Gas Chromatography, References