21H,23H-porphine
- Formula: C20H14N4
- Molecular weight: 310.3520
- CAS Registry Number: 101-60-0
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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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°solid | -264.56 ± 0.87 | kcal/mol | Ccb | Longo, Finarelli, et al., 1970 | |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°solid | -2094.68 ± 0.43 | kcal/mol | Ccb | Longo, Finarelli, et al., 1970 |
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 by: William E. Acree, Jr., James S. Chickos
Enthalpy of sublimation
| ΔsubH (kcal/mol) | Temperature (K) | Method | Reference |
|---|---|---|---|
| 21. ± 0.7 | 424. to 507. | Fluoresc | Stefanov, Stibor, et al., 2004 |
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 compiled by: Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 6.6 | PE | Dupuis, Roberge, et al., 1980 | |
| 6.9 | PE | Dupuis, Roberge, et al., 1980 | Vertical value |
References
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Longo, Finarelli, et al., 1970
Longo, F.R.; Finarelli, J.D.; Schmalzbach, E.; Alder, A.D.,
The enthalpy of formation of porphin,
J. Phys. Chem., 1970, 74, 3296-3297. [all data]
Stefanov, Stibor, et al., 2004
Stefanov, Andre; Stibor, Alexander; Dominguez-Clarimon, Alex; Arndt, Markus,
Sublimation enthalpy of dye molecules measured using fluorescence,
J. Chem. Phys., 2004, 121, 14, 6935, https://doi.org/10.1063/1.1792551
. [all data]
Dupuis, Roberge, et al., 1980
Dupuis, P.; Roberge, R.; Sandorfy, C.,
The very low ionization potentials of porphyrins and the possible role of rydberg states in photosynthesis,
Chem. Phys. Lett., 1980, 75, 434. [all data]
Notes
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- Symbols used in this document:
ΔcH°solid Enthalpy of combustion of solid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions ΔsubH Enthalpy of sublimation - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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