Benzene, 1,3-difluoro-
- Formula: C6H4F2
- Molecular weight: 114.0928
- IUPAC Standard InChIKey: UEMGWPRHOOEKTA-UHFFFAOYSA-N
- CAS Registry Number: 372-18-9
- 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, m-difluoro-; m-Difluorobenzene; 1,3-Difluorobenzene; meta-Difluorobenzene
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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
CAL - James S. Chickos, William E. Acree, Jr., Joel F. Liebman, Students of Chem 202 (Introduction to the Literature of Chemistry), University of Missouri -- St. Louis
DH - Eugene S. Domalski and Elizabeth D. Hearing
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 354. to 356. | K | N/A | PCR Inc., 1990 | BS |
Tboil | 356.2 | K | N/A | Weast and Grasselli, 1989 | BS |
Tboil | 355.7 | K | N/A | Majer and Svoboda, 1985 | |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 204.03 | K | N/A | Messerly and Finke, 1970 | Crystal phase 1 phase; Uncertainty assigned by TRC = 0.02 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 34.69 | kJ/mol | N/A | Majer and Svoboda, 1985 | |
ΔvapH° | 34.6 | kJ/mol | N/A | Osborn and Scott, 1980 | Based on data from 310. to 400. K. See also Basarová and Svoboda, 1991.; AC |
ΔvapH° | 34.55 | kJ/mol | V | Findlay, 1969 | ALS |
ΔvapH° | 34.7 ± 0.2 | kJ/mol | V | Good, Lacina, et al., 1962 | Corrected for CODATA value of ΔfH; ALS |
Enthalpy of vaporization
ΔvapH (kJ/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
31.1 | 355.7 | Majer and Svoboda, 1985 |
Enthalpy of fusion
ΔfusH (kJ/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
8.58 | 204. | Domalski and Hearing, 1996 | AC |
Entropy of fusion
ΔfusS (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
4.43 | 186.8 | Domalski and Hearing, 1996 | CAL |
42.05 | 204.0 |
Enthalpy of phase transition
ΔHtrs (kJ/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
0.82705 | 186.77 | crystaline, II | crystaline, I | Messerly and Finke, 1970, 2 | DH |
8.5810 | 204.03 | crystaline, I | liquid | Messerly and Finke, 1970, 2 | DH |
Entropy of phase transition
ΔStrs (J/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
4.428 | 186.77 | crystaline, II | crystaline, I | Messerly and Finke, 1970, 2 | DH |
42.06 | 204.03 | crystaline, I | liquid | Messerly and Finke, 1970, 2 | DH |
References
Go To: Top, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
PCR Inc., 1990
PCR Inc.,
Research Chemicals Catalog 1990-1991, PCR Inc., Gainesville, FL, 1990, 1. [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]
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]
Messerly and Finke, 1970
Messerly, J.F.; Finke, H.L.,
hexafluorobenzene and 1,3-difluorobenzene low temperature calorimetric studies and chemical thermodynamic properties,
J. Chem. Thermodyn., 1970, 2, 867-80. [all data]
Osborn and Scott, 1980
Osborn, A.G.; Scott, D.W.,
Vapor pressures of 17 miscellanenous organic compounds,
J. Chem. Thermodyn., 1980, 12, 429-438. [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]
Findlay, 1969
Findlay, T.J.V.,
Vapor pressures of fluorobenzenes from 5° to 50°C,
J. Chem. Eng. Data, 1969, 14, 229. [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]
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]
Messerly and Finke, 1970, 2
Messerly, J.F.; Finke, H.L.,
Hexafluorobenzene and 1,3-difluorobenzene. Low-temperature calorimetric studies and chemical thermodynamic properties,
J. Chem. Thermodynam., 1970, 2, 867-880. [all data]
Notes
Go To: Top, Phase change data, References
- Symbols used in this document:
Tboil Boiling point Ttriple Triple point temperature ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion ΔvapH Enthalpy of vaporization ΔvapH° Enthalpy of vaporization at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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