Pentacene
- Formula: C22H14
- Molecular weight: 278.3466
- IUPAC Standard InChI: InChI=1S/C22H14/c1-2-6-16-10-20-14-22-12-18-8-4-3-7-17(18)11-21(22)13-19(20)9-15(16)5-1/h1-14H
- IUPAC Standard InChIKey: SLIUAWYAILUBJU-UHFFFAOYSA-N
- CAS Registry Number: 135-48-8
- 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: Lin-Dibenzanthracene; Lin-Naphthoanthracene; Benzo[b]naphthacene; 2,3:6,7-Dibenzanthracene; 2,3,6,7-Dibenzanthracene
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Gas phase thermochemistry data
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: Glushko Thermocenter, Russian Academy of Sciences, Moscow
Constant pressure heat capacity of gas
| Cp,gas (cal/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 13.56 | 50. | Dorofeeva O.V., 1988 | Recommended values were calculated statistically mechanically using force field approximation for polycyclic aromatic hydrocarbons to estimate the needed vibrational frequencies (see also [ Dorofeeva O.V., 1986, Moiseeva N.F., 1989]). These functions are reproduced in the reference book [ Frenkel M., 1994]. |
| 21.84 | 100. | ||
| 31.718 | 150. | ||
| 43.093 | 200. | ||
| 61.169 | 273.15 | ||
| 67.39 ± 0.84 | 298.15 | ||
| 67.844 | 300. | ||
| 91.123 | 400. | ||
| 110.53 | 500. | ||
| 126.04 | 600. | ||
| 138.41 | 700. | ||
| 148.39 | 800. | ||
| 156.57 | 900. | ||
| 163.36 | 1000. | ||
| 169.04 | 1100. | ||
| 173.83 | 1200. | ||
| 177.90 | 1300. | ||
| 181.38 | 1400. | ||
| 184.36 | 1500. |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, 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:
L - Sharon G. Lias
Data compiled as indicated in comments:
MM - Michael M. Meot-Ner (Mautner)
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
B - John E. Bartmess
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| IE (evaluated) | 6.63 ± 0.05 | eV | N/A | N/A | L |
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 1.392 ± 0.043 | IMRE | Crocker, Wang, et al., 1993 | ΔGea(584 K) = -31.2 kcal/mol; ΔSea (estimated) = -1.5 eu (anthracene, Chowdhury, Heinis, et al., 1986); B |
Gas basicity at 298K
| Gas basicity (review) (kcal/mol) | Reference | Comment |
|---|---|---|
| 199.8 | Dell'Erba, Gruttadauria, et al., 2000 | T = 300K; Equilibrium constants and ΔG from forward/reverse rate constant ratio. T = 300 K nominal FTICR temperature; MM |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 6.61 | EI | Stahl and Maquin, 1984 | LBLHLM |
| 6.64 | PE | Clark, Brogli, et al., 1972 | LLK |
| 6.74 ± 0.01 | PE | Boschi, Murrell, et al., 1972 | LLK |
| 6.6 ± 0.1 | EI | Gallegos, 1968 | RDSH |
| 6.61 | CTS | Kuroda, 1964 | RDSH |
| 6.62 | CTS | Briegleb, 1964 | RDSH |
| 6.23 | CTS | Matsen, 1956 | RDSH |
| 6.61 ± 0.02 | PE | Schmidt, 1977 | Vertical value; LLK |
References
Go To: Top, Gas phase thermochemistry 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.
Dorofeeva O.V., 1988
Dorofeeva O.V.,
Thermodynamic Properties of Polycyclic Aromatic Hydrocarbons in the Gaseous Phase. Institute for High Temperatures, USSR Academy of Sciences, Preprint No.1-238 (in Russian), Moscow, 1988. [all data]
Dorofeeva O.V., 1986
Dorofeeva O.V.,
On calculation of thermodynamic properties of polycyclic aromatic hydrocarbons,
Thermochim. Acta, 1986, 102, 59-66. [all data]
Moiseeva N.F., 1989
Moiseeva N.F.,
Development of Benson group additivity method for estimation of ideal gas thermodynamic properties of polycyclic aromatic hydrocarbons,
Thermochim. Acta, 1989, 153, 77-85. [all data]
Frenkel M., 1994
Frenkel M.,
Thermodynamics of Organic Compounds in the Gas State, Vol. I, II, Thermodynamics Research Center, College Station, Texas, 1994, 1994. [all data]
Crocker, Wang, et al., 1993
Crocker, L.; Wang, T.B.; Kebarle, P.,
Electron Affinities of Some Polycyclic Aromatic Hydrocarbons, Obtained from Electron-Transfer Equilibria,
J. Am. Chem. Soc., 1993, 115, 17, 7818, https://doi.org/10.1021/ja00070a030
. [all data]
Chowdhury, Heinis, et al., 1986
Chowdhury, S.; Heinis, T.; Grimsrud, E.P.; Kebarle, P.,
Entropy Changes and Electron Affinities from Gas-Phase Electron Transfer Equilibria: A- + B = A + B-,
J. Phys. Chem., 1986, 90, 12, 2747, https://doi.org/10.1021/j100403a037
. [all data]
Dell'Erba, Gruttadauria, et al., 2000
Dell'Erba, C.; Gruttadauria, M.; Mugnoli, A.; Noto, R.; Novi, M.; Occhiucci, G.; Petrillo, G.; Spinelli, D.,
Gas-phase and solution basicities of some 2,6-dialkylphenyl ketones: A comparative analysis,
Tetrahedron, 2000, 56, 4565. [all data]
Stahl and Maquin, 1984
Stahl, D.; Maquin, F.,
Charge-stripping mass spectrometry of molecular ions from polyacenes and molecular orbital theory,
Chem. Phys. Lett., 1984, 108, 613. [all data]
Clark, Brogli, et al., 1972
Clark, P.A.; Brogli, F.; Heilbronner, E.,
The π-orbital energies of the acenes,
Helv. Chim. Acta, 1972, 55, 1415. [all data]
Boschi, Murrell, et al., 1972
Boschi, R.; Murrell, J.N.; Schmidt, W.,
Photoelectron spectra of polycyclic aromatic hydrocarbons,
Faraday Discuss. Chem. Soc., 1972, 54, 116. [all data]
Gallegos, 1968
Gallegos, E.J.,
Mass spectrometry and ionization energies of some condensed-ring aromatic and heterocyclic compounds,
J. Phys. Chem., 1968, 72, 3452. [all data]
Kuroda, 1964
Kuroda, H.,
Ionization potentials of polycyclic aromatic hydrocarbons,
Nature, 1964, 201, 1214. [all data]
Briegleb, 1964
Briegleb, G.,
Electron affinity of organic molecules,
Angew. Chem. Intern. Ed., 1964, 3, 617. [all data]
Matsen, 1956
Matsen, F.A.,
Electron affinities, methyl affinities, and ionization energies of condensed ring aromatic hydrocarbons,
J. Chem. Phys., 1956, 24, 602. [all data]
Schmidt, 1977
Schmidt, W.,
Photoelectron spectra of polynuclear aromatics. V. Correlations with ultraviolet absorption spectra in the catacondensed series,
J. Chem. Phys., 1977, 66, 828. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
Cp,gas Constant pressure heat capacity of gas EA Electron affinity IE (evaluated) Recommended ionization energy - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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