Hydroxymethyl radical
- Formula: CH3O
- Molecular weight: 31.0339
- IUPAC Standard InChI: InChI=1S/CH3O/c1-2/h2H,1H2
- IUPAC Standard InChIKey: CBOIHMRHGLHBPB-UHFFFAOYSA-N
- CAS Registry Number: 2597-43-5
- 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. - Isotopologues:
- Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Other data available:
- Data at other public NIST sites:
- Options:
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.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -9. ± 4. | kJ/mol | N/A | Tsang, 1996 |
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:
HL - Edward P. Hunter and Sharon G. Lias
Data compiled as indicated in comments:
LL - Sharon G. Lias and Joel F. Liebman
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
View reactions leading to CH3O+ (ion structure unspecified)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| Proton affinity (review) | 695. | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
| Quantity | Value | Units | Method | Reference | Comment |
| Gas basicity | 662.5 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°(+) ion | 718. ± 2. | kJ/mol | N/A | N/A |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 7.562 ± 0.004 | EVAL | Johnson and Hudgens, 1996 | LL |
| 7.553 ± 0.006 | PI | Berkowitz, Ellison, et al., 1994 | Unpublished results of B. Ruscic and J. Berkowitz; LL |
| 7.56 ± 0.02 | PI | Tao, Klemm, et al., 1992 | LL |
| 7.56 ± 0.01 | PE | Dyke, Ellis, et al., 1984 | LBLHLM |
| 7.6 | DER | Griller and Lossing, 1981 | LLK |
| 8.14 ± 0.15 | EI | Fisher and Henderson, 1967 | RDSH |
| 8.14 ± 0.01 | PE | Dyke, Ellis, et al., 1984 | Vertical value; LBLHLM |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| CHO+ | 8.61 | H2 | PI | Tao, Klemm, et al., 1992 | LL |
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.
Tsang, 1996
Tsang, W.,
Heats of Formation of Organic Free Radicals by Kinetic Methods
in Energetics of Organic Free Radicals, Martinho Simoes, J.A.; Greenberg, A.; Liebman, J.F., eds., Blackie Academic and Professional, London, 1996, 22-58. [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]
Johnson and Hudgens, 1996
Johnson, R.D., III; Hudgens, J.W.,
Structural and thermochemical properties of hydroxymethyl (CH2OH) radicals and cations derived from observations of B 2A'(3p)←X 2A" electronic spectra and from ab initio calculations,
J. Phys. Chem., 1996, 100, 19874. [all data]
Berkowitz, Ellison, et al., 1994
Berkowitz, J.; Ellison, G.B.; Gutman, D.,
Three methods to measure RH bond energies,
J. Phys. Chem., 1994, 98, 2744. [all data]
Tao, Klemm, et al., 1992
Tao, W.; Klemm, R.B.; Nesbitt, F.L.; Stief, J.L.,
A discharge flow-photoionization mass spectrometric study of hydroxymethyl radicals (H2COH and H2COD): Photoionization spectrum and ionization energy,
J. Phys. Chem., 1992, 96, 104. [all data]
Dyke, Ellis, et al., 1984
Dyke, J.M.; Ellis, A.R.; Jonathan, N.; Keddar, N.; Morris, A.,
Observation of the CH2OH radical in the gas Ppase by vacuum ultraviolet photoelectron spectroscopy,
Chem. Phys. Lett., 1984, 111, 207. [all data]
Griller and Lossing, 1981
Griller, D.; Lossing, F.P.,
On the thermochemistry of α-aminoalkyl radicals,
J. Am. Chem. Soc., 1981, 103, 1586. [all data]
Fisher and Henderson, 1967
Fisher, I.P.; Henderson, E.,
Mass spectrometry of free radicals,
J. Chem. Soc. Faraday Trans., 1967, 63, 1342. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
AE Appearance energy ΔfH°gas Enthalpy of formation of gas at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
- The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
- Customer support for NIST Standard Reference Data products.