Cyclopentene
- Formula: C5H8
- Molecular weight: 68.1170
- IUPAC Standard InChIKey: LPIQUOYDBNQMRZ-UHFFFAOYSA-N
- CAS Registry Number: 142-29-0
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
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Gas phase thermochemistry 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:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | 8.5 | kcal/mol | Chyd | Allinger, Dodziuk, et al., 1982 | ALS |
ΔfH°gas | 8.2 | kcal/mol | Eqk | Furuyama, Golden, et al., 1970 | ALS |
ΔfH°gas | 7.79 | kcal/mol | N/A | Labbauf and Rossini, 1961 | Value computed using ΔfHliquid° value of 4.27±0.63 kj/mol from Labbauf and Rossini, 1961 and ΔvapH° value of 28.37 kj/mol from missing citation.; DRB |
ΔfH°gas | 7.93 | kcal/mol | N/A | Epstein, Pitzer, et al., 1949 | Value computed using ΔfHliquid° value of 4.85±0.67 kj/mol from Epstein, Pitzer, et al., 1949 and ΔvapH° value of 28.37 kj/mol from missing citation.; DRB |
Quantity | Value | Units | Method | Reference | Comment |
S°gas | 69.230 | cal/mol*K | N/A | Beckett C.W., 1948 | GT |
Constant pressure heat capacity of gas
Cp,gas (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
8.585 | 50. | Dorofeeva O.V., 1986 | Although S(298.15 K) value is 1.6 J/mol*K larger than that obtained from calorimetric data [ Beckett C.W., 1948] and calculated in previous works [ Beckett C.W., 1948, Epstein M.B., 1949, Furuyama S., 1970, Draeger J.A., 1983], it is selected here because of using the most reliable vibrational frequencies in [ Dorofeeva O.V., 1986]. The recommended thermodynamic functions are in good agreement with results of detail force-field calculations [ Lenz T.G., 1989, Lenz T.G., 1990]. Discrepancies with above mentioned calculations amount to 1.6-9.1 and 0.8-6.2 J/mol*K for S(T) and Cp(T), respectively.; GT |
9.649 | 100. | ||
10.93 | 150. | ||
13.08 | 200. | ||
17.64 | 273.15 | ||
19.43 ± 0.48 | 298.15 | ||
19.56 | 300. | ||
26.788 | 400. | ||
33.219 | 500. | ||
38.571 | 600. | ||
43.009 | 700. | ||
46.730 | 800. | ||
49.883 | 900. | ||
52.572 | 1000. | ||
54.876 | 1100. | ||
56.855 | 1200. | ||
58.561 | 1300. | ||
60.036 | 1400. | ||
61.312 | 1500. |
Condensed phase thermochemistry 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:
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 |
---|---|---|---|---|---|
ΔfH°liquid | 1.02 ± 0.15 | kcal/mol | Ccb | Labbauf and Rossini, 1961 | ALS |
ΔfH°liquid | 1.16 ± 0.16 | kcal/mol | Ccb | Epstein, Pitzer, et al., 1949 | Unpubished results; ALS |
Quantity | Value | Units | Method | Reference | Comment |
ΔcH°liquid | -744.55 ± 0.14 | kcal/mol | Ccb | Labbauf and Rossini, 1961 | Corresponding ΔfHºliquid = 1.03 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS |
Quantity | Value | Units | Method | Reference | Comment |
S°liquid | 48.100 | cal/mol*K | N/A | Huffman, Eaton, et al., 1948 | DH |
Constant pressure heat capacity of liquid
Cp,liquid (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
29.250 | 298.15 | Huffman, Eaton, et al., 1948 | T = 12 to 300 K.; DH |
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
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
AC - William E. Acree, Jr., James S. Chickos
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 | 317. ± 2. | K | AVG | N/A | Average of 28 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 138. ± 1. | K | AVG | N/A | Average of 8 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 138.13 | K | N/A | Huffman, Eaton, et al., 1948, 2 | Crystal phase 1 phase; Uncertainty assigned by TRC = 0.05 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 506.5 ± 0.5 | K | N/A | Tsonopoulos and Ambrose, 1996 | |
Tc | 507.6 | K | N/A | Teja and Anselme, 1990 | Uncertainty assigned by TRC = 0.4 K; TRC |
Tc | 507.0 | K | N/A | Teja and Rosenthal, 1990 | Uncertainty assigned by TRC = 0.6 K; TRC |
Tc | 506.1 | K | N/A | Ambrose and Grant, 1957 | Uncertainty assigned by TRC = 0.15 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 47.4 ± 0.5 | atm | N/A | Tsonopoulos and Ambrose, 1996 | |
Pc | 47.39 | atm | N/A | Teja and Rosenthal, 1990 | Uncertainty assigned by TRC = 0.30 atm; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Vc | 0.245 | l/mol | N/A | Tsonopoulos and Ambrose, 1996 | |
Quantity | Value | Units | Method | Reference | Comment |
ρc | 4.08 ± 0.05 | mol/l | N/A | Tsonopoulos and Ambrose, 1996 | |
ρc | 4.08 | mol/l | N/A | Teja and Anselme, 1990 | Uncertainty assigned by TRC = 0.09 mol/l; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 6.780 | kcal/mol | V | Lister, 1941 | Halogenation at 27 C; ALS |
Enthalpy of vaporization
ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
7.15 | 264. | A | Stephenson and Malanowski, 1987 | Based on data from 249. to 318. K.; AC |
5.93 | 299. | MM | Forziati, Camin, et al., 1950 | Based on data from 289. to 318. K.; AC |
6.79 | 300. | N/A | Lister, 1941 | Based on data from 230. to 293. K.; AC |
Enthalpy of fusion
ΔfusH (kcal/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
0.803 | 138.1 | Domalski and Hearing, 1996 | AC |
Entropy of fusion
ΔfusS (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
1.32 | 87.07 | Domalski and Hearing, 1996 | CAL |
5.813 | 138.1 |
Enthalpy of phase transition
ΔHtrs (kcal/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
0.1146 | 87.07 | crystaline, II | crystaline, I | Huffman, Eaton, et al., 1948 | DH |
0.80387 | 138.13 | crystaline, I | liquid | Huffman, Eaton, et al., 1948 | DH |
Entropy of phase transition
ΔStrs (cal/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
2.27 | 87.07 | crystaline, II | crystaline, I | Huffman, Eaton, et al., 1948 | DH |
5.820 | 138.13 | crystaline, I | liquid | Huffman, Eaton, et al., 1948 | DH |
Henry's Law 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 by: Rolf Sander
Henry's Law constant (water solution)
kH(T) = k°H exp(d(ln(kH))/d(1/T) ((1/T) - 1/(298.15 K)))
k°H = Henry's law constant for solubility in water at 298.15 K (mol/(kg*bar))
d(ln(kH))/d(1/T) = Temperature dependence constant (K)
k°H (mol/(kg*bar)) | d(ln(kH))/d(1/T) (K) | Method | Reference | Comment |
---|---|---|---|---|
0.015 | Q | N/A | missing citation give several references for the Henry's law constants but don't assign them to specific species. | |
0.016 | V | N/A |
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:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
View reactions leading to C5H8+ (ion structure unspecified)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 9.01 ± 0.01 | eV | N/A | N/A | L |
Quantity | Value | Units | Method | Reference | Comment |
Proton affinity (review) | 183.2 | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
Quantity | Value | Units | Method | Reference | Comment |
Gas basicity | 175.4 | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
9.18 | PE | Kimura, Katsumata, et al., 1981 | LLK |
9.1 | EI | Harris, McKinnon, et al., 1979 | LLK |
9.01 ± 0.02 | PE | Bieri, Burger, et al., 1977 | LLK |
9.00 | EI | Lossing and Traeger, 1975 | LLK |
9.02 ± 0.01 | PE | Rang, Paldoia, et al., 1974 | LLK |
9.00 | EI | Holmes, 1974 | LLK |
9.01 ± 0.01 | PE | Praet and Delwiche, 1970 | RDSH |
9.02 ± 0.01 | PI | Demeo and El-Sayed, 1970 | RDSH |
9.01 | PE | Bischof and Heilbronner, 1970 | RDSH |
9.00 | PE | Dewar and Worley, 1969 | RDSH |
9.01 ± 0.01 | PI | Watanabe, Nakayama, et al., 1962 | RDSH |
9.20 | PE | Wiberg, Ellison, et al., 1976 | Vertical value; LLK |
9.01 ± 0.03 | PE | Heilbronner, Hoshi, et al., 1976 | Vertical value; LLK |
9.17 | PE | Bertoti, Cradock, et al., 1976 | Vertical value; LLK |
9.12 | PE | Hentrich, Gunkel, et al., 1974 | Vertical value; LLK |
9.18 | PE | Clary, Lewis, et al., 1974 | Vertical value; LLK |
9.20 | PE | Batich, Heilbronner, et al., 1974 | Vertical value; LLK |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
C4H5+ | 11.83 | CH3 | EI | Holmes, 1974 | LLK |
C5H7+ | 9.00 | H | EI | Lossing and Traeger, 1975, 2 | LLK |
C5H7+ | 10.98 | H | EI | Lossing and Traeger, 1975 | LLK |
C5H7+ | 10.98 | H | EI | Holmes, 1974 | LLK |
C5H7+ | 11.19 | H | EI | Pignataro, Cassuto, et al., 1967 | RDSH |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Allinger, Dodziuk, et al., 1982
Allinger, N.L.; Dodziuk, H.; Rogers, D.W.; Naik, S.N.,
Heats of hydrogenation and formation of some 5-membered ring compounds by molecular mechanics calculations and direct measurements,
Tetrahedron, 1982, 38, 1593-1597. [all data]
Furuyama, Golden, et al., 1970
Furuyama, S.; Golden, D.M.; Benson, S.W.,
Thermochemistry of cyclopentene and cyclopentadiene from studies of gas-phase equilibria,
J. Chem. Thermodyn., 1970, 2, 161-169. [all data]
Labbauf and Rossini, 1961
Labbauf, A.; Rossini, F.D.,
Heats of combustion, formation, and hydrogenation of 14 selected cyclomonoolefin hydrocarbons,
J. Phys. Chem., 1961, 65, 476-480. [all data]
Epstein, Pitzer, et al., 1949
Epstein, M.B.; Pitzer, K.S.; Rossini, F.D.,
Heats, equilibrium constants, and free energies of formation of cyclopentene and cyclohexene,
J. Res. NBS, 1949, 42, 379-382. [all data]
Beckett C.W., 1948
Beckett C.W.,
The thermodynamic properties and molecular structure of cyclopentene and cyclohexene,
J. Am. Chem. Soc., 1948, 70, 4227-4230. [all data]
Dorofeeva O.V., 1986
Dorofeeva O.V.,
Thermodynamic properties of twenty-one monocyclic hydrocarbons,
J. Phys. Chem. Ref. Data, 1986, 15, 437-464. [all data]
Epstein M.B., 1949
Epstein M.B.,
Heats, equilibrium constants, and free energies of formation of cyclopentene and cyclohexene,
J. Res. Nat. Bur. Stand., 1949, 42, 379-382. [all data]
Furuyama S., 1970
Furuyama S.,
Thermochemistry of cyclopentene and cyclopentadiene from studies of gas-phase equilibria,
J. Chem. Thermodyn., 1970, 2, 161-169. [all data]
Draeger J.A., 1983
Draeger J.A.,
Chemical thermodynamic properties of molecules that undergo inversion. I. Aniline, methylamine, cyclopropylamine, and cyclopentene,
J. Chem. Thermodyn., 1983, 15, 367-376. [all data]
Lenz T.G., 1989
Lenz T.G.,
Force-field calculations giving accurate conformation, Hf(T), S(T), and Cp(T) for unsaturated acyclic and cyclic hydrocarbons,
J. Phys. Chem., 1989, 93, 1588-1592. [all data]
Lenz T.G., 1990
Lenz T.G.,
Force field calculation of equilibrium thermodynamic properties: Diels-Alder reaction of 1,3-butadiene and ethylene and Diels-Alder dimerization of 1,3-butadiene,
J. Comput. Chem., 1990, 11, 351-360. [all data]
Huffman, Eaton, et al., 1948
Huffman, H.M.; Eaton, M.; Oliver, G.D.,
The heat capacities, heats of transition, heats of fusion and entropies of cyclopentene and cyclohexene,
J. Am. Chem. Soc., 1948, 70, 2911-2914. [all data]
Huffman, Eaton, et al., 1948, 2
Huffman, H.M.; Eaton, M.; Oliver, G.D.,
The heat capacities, heats of transition, heats of fusion and entropies of cyclopentene and cyclohexene,
J. Am. Chem. Soc., 1948, 70, 2911. [all data]
Tsonopoulos and Ambrose, 1996
Tsonopoulos, C.; Ambrose, D.,
Vapor-Liquid Critical Properties of Elements and Compounds. 6. Unsaturated Aliphatic Hydrocarbons,
J. Chem. Eng. Data, 1996, 41, 645-656. [all data]
Teja and Anselme, 1990
Teja, A.S.; Anselme, M.J.,
The critical properties of thermally stable and unstable fluids. II. 1986 results,
AIChE Symp. Ser., 1990, 86, 279, 122-7. [all data]
Teja and Rosenthal, 1990
Teja, A.S.; Rosenthal, D.J.,
The Critical Pressures and Temperatures of Twelve Substances Using A Low Residence Time Flow Apparatus,
AIChE Symp. Ser., 1990, 86, 279, 133-7. [all data]
Ambrose and Grant, 1957
Ambrose, D.; Grant, D.G.,
The Critical Temperatures of Some Hydrocarbons and Pyridine Bases,
Trans. Faraday Soc., 1957, 53, 771. [all data]
Lister, 1941
Lister, M.W.,
Heats of organic reactions. X. Heats of bromination of cyclic olefins,
J. Am. Chem. Soc., 1941, 63, 143-149. [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]
Forziati, Camin, et al., 1950
Forziati, A.F.; Camin, D.L.; Rossini, F.D.,
Density, refractive index, boiling point, and vapor pressure of eight monoolefin (1-alkene), six pentadiene, and two cyclomonoolefin hydrocarbons,
J. RES. NATL. BUR. STAN., 1950, 45, 5, 406, https://doi.org/10.6028/jres.045.044
. [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]
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]
Harris, McKinnon, et al., 1979
Harris, D.; McKinnon, S.; Boyd, R.K.,
The origins of the base peak in the electron impact spectrum of limonene,
Org. Mass Spectrom., 1979, 14, 265. [all data]
Bieri, Burger, et al., 1977
Bieri, G.; Burger, F.; Heilbronner, E.; Maier, J.P.,
Valence ionization enrgies of hydrocarbons,
Helv. Chim. Acta, 1977, 60, 2213. [all data]
Lossing and Traeger, 1975
Lossing, F.P.; Traeger, J.C.,
Stabilization in cyclopentadienyl, cyclopentenyl, and cyclopentyl cations,
J. Am. Chem. Soc., 1975, 97, 1579. [all data]
Rang, Paldoia, et al., 1974
Rang, S.; Paldoia, P.; Talvari, A.,
Ionization potentials of unsaturated hydrocarbons. 2. Mono-substituted cyclopentenes and cyclohexenes,
Eesti. NSV Tead. Akad. Toim., 1974, 354. [all data]
Holmes, 1974
Holmes, J.L.,
The mass spectra of isomeric hydrocarbons - II: The C5H8 isomers, spiropentane, cyclopentene, 1,3-pentadiene and isoprene; the mechanisms and energetics of their fragmentations,
Org. Mass Spectrom., 1974, 8, 247. [all data]
Praet and Delwiche, 1970
Praet, M.-T.; Delwiche, J.,
Ionization energies of some cyclic molecules,
Chem. Phys. Lett., 1970, 5, 546. [all data]
Demeo and El-Sayed, 1970
Demeo, D.A.; El-Sayed, M.A.,
Ionization potential and structure of olefins,
J. Chem. Phys., 1970, 52, 2622. [all data]
Bischof and Heilbronner, 1970
Bischof, P.; Heilbronner, E.,
Photoelektron-Spektren von Cycloalkenen und Cycloalkadienen,
Helv. Chim. Acta, 1970, 53, 1677. [all data]
Dewar and Worley, 1969
Dewar, M.J.S.; Worley, S.D.,
Photoelectron spectra of molecules. I. Ionization potentials of some organic molecules and their interpretation,
J. Chem. Phys., 1969, 50, 654. [all data]
Watanabe, Nakayama, et al., 1962
Watanabe, K.; Nakayama, T.; Mottl, J.,
Ionization potentials of some molecules,
J. Quant. Spectry. Radiative Transfer, 1962, 2, 369. [all data]
Wiberg, Ellison, et al., 1976
Wiberg, K.B.; Ellison, G.B.; Wendoloski, J.J.; Brundle, C.R.; Kuebler, N.A.,
Electronic states of organic molecules. 3. Photoelectron spectra of cycloalkenes and methylenecycloalkanes,
J. Am. Chem. Soc., 1976, 98, 7179. [all data]
Heilbronner, Hoshi, et al., 1976
Heilbronner, E.; Hoshi, T.; von Rosenberg, J.L.; Hafner, K.,
Alkyl-induced, natural hypsochromic shifts of the 2A←2X and 2B←2X transitions of azulene and naphthalene radical cations,
Nouv. J. Chim., 1976, 1, 105. [all data]
Bertoti, Cradock, et al., 1976
Bertoti, I.; Cradock, S.; Ebsworth, E.A.V.; Whiteford, R.A.,
Photoelectron spectra and transannular interactions in 1-silacyclopent-3-enes,
J. Chem. Soc. Dalton Trans., 1976, 937. [all data]
Hentrich, Gunkel, et al., 1974
Hentrich, G.; Gunkel, E.; Klessinger, M.,
Photoelektronenspektren organischer verbindungen. 4. Photoelektronenspektren ungesattigter carbonylverbindungen,
J. Mol. Struct., 1974, 21, 231. [all data]
Clary, Lewis, et al., 1974
Clary, D.C.; Lewis, A.A.; Morland, D.; Murrell, J.N.; Heilbronner, E.,
Ionization potentials of cycloalkenes,
J. Chem. Soc. Faraday Trans. 2, 1974, 70, 1889. [all data]
Batich, Heilbronner, et al., 1974
Batich, C.; Heilbronner, E.; Rommel, E.; Semmelhack, M.F.; Foos, J.S.,
Equivalence of the energy gaps {DELTA}I(1,2) and {DELTA}E(1,2) between corresponding bands in the photoelectron (I) and electronic absorption (E) spectra of spiro[4.4]nonatetraene. An amusing consequence of spiroconjugation,
J. Am. Chem. Soc., 1974, 96, 7662. [all data]
Lossing and Traeger, 1975, 2
Lossing, F.P.; Traeger, J.C.,
Free radicals by mass spectrometry XLVI. Heats of formation of C5H7 and C5H9 radicals and cations.,
J. Am. Chem. Soc., 1975, 19, 9. [all data]
Pignataro, Cassuto, et al., 1967
Pignataro, S.; Cassuto, A.; Lossing, F.P.,
Free radicals by mass spectrometry. XXXVI. Ionization potentials of conjugated and nonconjugated radicals,
J. Am. Chem. Soc., 1967, 89, 3693. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, References
- Symbols used in this document:
AE Appearance energy Cp,gas Constant pressure heat capacity of gas Cp,liquid Constant pressure heat capacity of liquid IE (evaluated) Recommended ionization energy Pc Critical pressure S°gas Entropy of gas at standard conditions S°liquid Entropy of liquid at standard conditions Tboil Boiling point Tc Critical temperature Tfus Fusion (melting) point Ttriple Triple point temperature Vc Critical volume d(ln(kH))/d(1/T) Temperature dependence parameter for Henry's Law constant k°H Henry's Law constant at 298.15K ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition ΔcH°liquid Enthalpy of combustion of liquid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion ΔvapH Enthalpy of vaporization ΔvapH° Enthalpy of vaporization at standard conditions ρc Critical density - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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