9H-Purine
- Formula: C5H4N4
- Molecular weight: 120.1121
- IUPAC Standard InChI: InChI=1S/C5H4N4/c1-4-5(8-2-6-1)9-3-7-4/h1-3H,(H,6,7,8,9)
- IUPAC Standard InChIKey: KDCGOANMDULRCW-UHFFFAOYSA-N
- CAS Registry Number: 120-73-0
- 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: 7H-Purine; 1H-Purine; Purine; β-Purine; Isopurine; 3,5,7-Triazaindole; 6H-Imidazo[4,5-d]pyrimidine; Imidazo(4,5-d)pyrimidine; NSC 753; X 128; 7H-Imidazo(4,5-d)pyrimidine
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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
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
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| Proton affinity (review) | 219.9 | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
| Quantity | Value | Units | Method | Reference | Comment |
| Gas basicity | 212.3 | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 9.7 ± 0.1 | EI | Lifschitz, Bergmann, et al., 1967 | RDSH |
| 9.52 ± 0.03 | PE | Hush and Cheung, 1975 | Vertical value; LLK |
UV/Visible spectrum
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Spectrum
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Additional Data
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| Source | Perkampus and Braunschweig, 1968 |
|---|---|
| Owner | INEP CP RAS, NIST OSRD Collection (C) 2007 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
| Origin | INSTITUTE OF ENERGY PROBLEMS OF CHEMICAL PHYSICS, RAS |
| Source reference | RAS UV No. 19898 |
| Instrument | Zeiss PMQ II |
| Melting point | 216-217 |
References
Go To: Top, Gas phase ion energetics data, UV/Visible spectrum, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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]
Lifschitz, Bergmann, et al., 1967
Lifschitz, C.; Bergmann, E.D.; Pullman, B.,
The ionization potentials of biological purines and pyrimidines,
Tetrahedron Lett., 1967, 4583. [all data]
Hush and Cheung, 1975
Hush, N.S.; Cheung, A.S.,
Ionization potentials and donor properties of nucleic acid bases and related compounds,
Chem. Phys. Lett., 1975, 34, 11. [all data]
Perkampus and Braunschweig, 1968
Perkampus, H.-H.; Braunschweig, T.H.,
UV atlas of organic compounds, 1968, 4, H3/1. [all data]
Notes
Go To: Top, Gas phase ion energetics data, UV/Visible spectrum, References
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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