Isoxazole
- Formula: C3H3NO
- Molecular weight: 69.0620
- IUPAC Standard InChIKey: CTAPFRYPJLPFDF-UHFFFAOYSA-N
- CAS Registry Number: 288-14-2
- 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: 1-Oxa-2-azacyclopentadiene; Isooxazole
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Gas phase ion energetics data
Go To: Top, Mass spectrum (electron ionization), UV/Visible spectrum, Gas Chromatography, 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:
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
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 10. ± 0.1 | eV | N/A | N/A | L |
Quantity | Value | Units | Method | Reference | Comment |
Proton affinity (review) | 848.6 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
Quantity | Value | Units | Method | Reference | Comment |
Gas basicity | 816.8 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
9.93 ± 0.05 | EI | Bouchoux and Hoppilliard, 1981 | LLK |
9.99 ± 0.05 | PE | Baker, Betteridge, et al., 1970 | RDSH |
10.20 | PE | Daamen, Oskam, et al., 1979 | Vertical value; LLK |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
HCO+ | 13.62 | ? | EI | Bouchoux and Hoppilliard, 1981 | LLK |
CNO+ | 12.24 | C2H3 | EI | Bouchoux and Hoppilliard, 1981 | LLK |
C2H2N+ | 13.34 | HCO | EI | Bouchoux and Hoppilliard, 1981 | LLK |
C2H3N+ | 11.34 ± 0.05 | CO | EI | Buschek, Holmes, et al., 1986 | LBLHLM |
C2H3N+ | 11.80 | CO | EI | Bouchoux and Hoppilliard, 1981 | LLK |
C3H2NO+ | 11.24 | H | EI | Bouchoux and Hoppilliard, 1981 | LLK |
Mass spectrum (electron ionization)
Go To: Top, Gas phase ion energetics data, UV/Visible spectrum, Gas Chromatography, 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: NIST Mass Spectrometry Data Center, William E. Wallace, director
Spectrum
Additional Data
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Owner | NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
---|---|
Origin | Japan AIST/NIMC Database- Spectrum MS-NW-7367 |
NIST MS number | 233403 |
UV/Visible spectrum
Go To: Top, Gas phase ion energetics data, Mass spectrum (electron ionization), Gas Chromatography, References, Notes
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 | Johnson and Sheridan, 1967 |
---|---|
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. 19849 |
Instrument | Unicam SP 500 |
Gas Chromatography
Go To: Top, Gas phase ion energetics data, Mass spectrum (electron ionization), UV/Visible spectrum, 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: NIST Mass Spectrometry Data Center, William E. Wallace, director
Kovats' RI, non-polar column, isothermal
Column type | Active phase | Temperature (C) | I | Reference | Comment |
---|---|---|---|---|---|
Capillary | OV-101 | 110. | 590. | Zhuravleva, 2000 | 50. m/0.3 mm/0.4 μm, He |
Capillary | OV-101 | 110. | 590. | Golovnya, Kuz'menko, et al., 1999 | 50. m/0.3 mm/0.4 μm, He |
References
Go To: Top, Gas phase ion energetics data, Mass spectrum (electron ionization), UV/Visible spectrum, Gas Chromatography, 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]
Bouchoux and Hoppilliard, 1981
Bouchoux, G.; Hoppilliard, Y.,
Fragmentation mechanisms of isoxazole,
Org. Mass Spectrom., 1981, 16, 459. [all data]
Baker, Betteridge, et al., 1970
Baker, A.D.; Betteridge, D.; Kemp, N.R.; Kirby, R.E.,
Application of photoelectron spectrometry to pesticide analysis. Photoelectron spectra of fivemembered heterocycles and related molecules,
Anal. Chem., 1970, 42, 1064. [all data]
Daamen, Oskam, et al., 1979
Daamen, H.; Oskam, A.; Stufkens, D.J.; Waaijers, H.W.,
Bonding properties of group VIB metal pentacarbonyl azole complexes studied by electronic absorption, photoelectron, 13C NMR and vibrational spectroscopy,
Inorg. Chim. Acta, 1979, 34, 253. [all data]
Buschek, Holmes, et al., 1986
Buschek, J.M.; Holmes, J.L.; Lossing, F.P.,
The mass spectrometric generation of neutral ethynamine HC≡CNH2 and C2H3N isomers.,
Org. Mass Spectrom., 1986, 21, 729. [all data]
Johnson and Sheridan, 1967
Johnson, E.A.; Sheridan, J.,
UV atlas of organic compounds, 1967, 3, G3/2. [all data]
Zhuravleva, 2000
Zhuravleva, I.L.,
Evaluation of the polarity and boiling points of nitrogen-containing heterocyclic compounds by gas chromatography,
Russ. Chem. Bull. (Engl. Transl.), 2000, 49, 2, 325-328, https://doi.org/10.1007/BF02494682
. [all data]
Golovnya, Kuz'menko, et al., 1999
Golovnya, R.V.; Kuz'menko, T.E.; Zhuravleva, I.L.,
Gas chromatographic indicator of the ability of five- and six-membered heterocyclic nitrogen-containing compounds for self-association in pure liquids,
Russ. Chem. Bull. (Engl. Transl.), 1999, 48, 4, 726-729, https://doi.org/10.1007/BF02496256
. [all data]
Notes
Go To: Top, Gas phase ion energetics data, Mass spectrum (electron ionization), UV/Visible spectrum, Gas Chromatography, References
- Symbols used in this document:
AE Appearance energy IE (evaluated) Recommended ionization energy - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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