Hydroxymethyl radical
- Formula: CH3O
- Molecular weight: 31.0339
- IUPAC Standard InChIKey: CBOIHMRHGLHBPB-UHFFFAOYSA-N
- CAS Registry Number: 2597-43-5
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, Vibrational and/or electronic energy levels, 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 | -2. ± 1. | kcal/mol | N/A | Tsang, 1996 |
Vibrational and/or electronic energy levels
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 compiled by: Marilyn E. Jacox
State: 3pz
Energy (cm-1) |
Med. | Transition | λmin (nm) |
λmax (nm) |
References | ||
---|---|---|---|---|---|---|---|
To = 41062 ± 3 | gas | 3pz-X | 217 | 244 | Dulcey and Hudgens, 1986 | ||
Bomse, Dougal, et al., 1986 | |||||||
Pagsberg, Munk, et al., 1988 | |||||||
Johnson and Hudgens, 1996 | |||||||
Aristov, Conroy, et al., 2000 | |||||||
Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
---|---|---|---|---|---|---|---|
a' | 4 | CO stretch | 1621 ± 7 | gas | MPI | Dulcey and Hudgens, 1986 Bomse, Dougal, et al., 1986 Johnson and Hudgens, 1996 | |
5 | CH2 scissors | 1465 ± 7 | gas | MPI | Dulcey and Hudgens, 1986 Johnson and Hudgens, 1996 | ||
6 | HCOH deform. | 1357 ± 7 | gas | MPI | Dulcey and Hudgens, 1986 Johnson and Hudgens, 1996 | ||
7 | HCOH deform. | 1107 ± 7 | gas | MPI | Dulcey and Hudgens, 1986 Johnson and Hudgens, 1996 | ||
a | 9 | Torsion | 993 ± 8 | gas | MPI | Johnson and Hudgens, 1996 | |
State: ?
Energy (cm-1) |
Med. | Transition | λmin (nm) |
λmax (nm) |
References | ||
---|---|---|---|---|---|---|---|
Td = 35700 | T | gas | Jacox and Milligan, 1973 | ||||
Jacox, 1981 | |||||||
State: 3px
Energy (cm-1) |
Med. | Transition | λmin (nm) |
λmax (nm) |
References | ||
---|---|---|---|---|---|---|---|
To = 35050 | gas | 3px-X | 243 | 285 | Pagsberg, Munk, et al., 1988 | ||
Feng, Huang, et al., 2002 | |||||||
State: 3s
Energy (cm-1) |
Med. | Transition | λmin (nm) |
λmax (nm) |
References | ||
---|---|---|---|---|---|---|---|
To = 25980 ± 80 | gas | Feng, Huang, et al., 2002 | |||||
State: X
Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
---|---|---|---|---|---|---|---|
a' | 1 | OH stretch | 3674.9 | gas | MPI | Feng, Wei, et al., 2004 | |
1 | OH stretch | 3650 | m | Ar | IR | Jacox and Milligan, 1973 Jacox, 1981 | |
1 | OH stretch | 3637 | m | N2 | IR | Jacox and Milligan, 1973 | |
2 | CH2 a-stretch | 3161.5 | gas | MPI | Feng, Wei, et al., 2004 | ||
3 | CH2 s-stretch | 3043.4 | gas | MPI | Feng, Wei, et al., 2004 | ||
4 | CH2 scissors | 1459 | w | Ar | IR | Jacox, 1981 | |
5 | OH deform. | 1334 | m | Ar | IR | Jacox and Milligan, 1973 Jacox, 1981 | |
6 | CO stretch | 1176 ± 7 | gas | MPI | Johnson and Hudgens, 1996 | ||
6 | CO stretch | 1183 | vs | Ar | IR | Jacox and Milligan, 1973 Jacox, 1981 | |
6 | CO stretch | 1183 | s | N2 | IR | Jacox and Milligan, 1973 | |
7 | HCOH deform. | 1048 | s | Ar | IR | Jacox and Milligan, 1973 Jacox, 1981 | |
7 | HCOH deform. | 1056 | m | N2 | IR | Jacox and Milligan, 1973 | |
a | 8 | Torsion | 420 | m | Ar | IR | Jacox and Milligan, 1973 Jacox, 1981 |
8 | Torsion | 482 | m | N2 | IR | Jacox and Milligan, 1973 | |
9 | H2CO OPLA | 234 ± 5 | gas | MPI | Johnson and Hudgens, 1996 | ||
Additional references: Jacox, 1994, page 237; Jacox, 1998, page 272; Jacox, 2003, page 258; Pagsberg, Munk, et al., 1989
Notes
w | Weak |
m | Medium |
s | Strong |
vs | Very strong |
T | Tentative assignment or approximate value |
o | Energy separation between the v = 0 levels of the excited and electronic ground states. |
d | Photodissociation threshold |
References
Go To: Top, Gas phase thermochemistry data, Vibrational and/or electronic energy levels, 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]
Dulcey and Hudgens, 1986
Dulcey, C.S.; Hudgens, J.W.,
Multiphoton ionization spectroscopy and vibrational analysis of a 3p Rydberg state of the hydroxymethyl radical,
J. Chem. Phys., 1986, 84, 10, 5262, https://doi.org/10.1063/1.449935
. [all data]
Bomse, Dougal, et al., 1986
Bomse, D.S.; Dougal, S.; Woodin, R.L.,
Multiphoton ionization studies of IR multiphoton dissociation: direct carbon-hydrogen bond cleavage in methanol,
J. Phys. Chem., 1986, 90, 12, 2640, https://doi.org/10.1021/j100403a016
. [all data]
Pagsberg, Munk, et al., 1988
Pagsberg, P.; Munk, J.; Sillesen, A.; Anastasi, C.,
UV spectrum and kinetics of hydroxymethyl radicals,
Chem. Phys. Lett., 1988, 146, 5, 375, https://doi.org/10.1016/0009-2614(88)87462-1
. [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]
Aristov, Conroy, et al., 2000
Aristov, V.; Conroy, D.; Reisler, H.,
Symmetry and lifetime of the hydroxymethyl radical in the 3p Rydberg state,
Chem. Phys. Lett., 2000, 318, 4-5, 393, https://doi.org/10.1016/S0009-2614(00)00042-7
. [all data]
Jacox and Milligan, 1973
Jacox, M.E.; Milligan, D.E.,
Matrix isolation study of the vacuum-ultraviolet photolysis of methanol,
J. Mol. Spectrosc., 1973, 47, 1, 148, https://doi.org/10.1016/0022-2852(73)90084-2
. [all data]
Jacox, 1981
Jacox, M.E.,
The reaction of excited argon atoms and of F atoms with Methanol. Vibrational spectrum of CH2OH isolated in solid argon,
Chem. Phys., 1981, 59, 1-2, 213, https://doi.org/10.1016/0301-0104(81)80101-2
. [all data]
Feng, Huang, et al., 2002
Feng, L.; Huang, X.; Reisler, H.,
Photodissociative spectroscopy of the hydroxymethyl radical (CH[sub 2]OH) in the 3s and 3p[sub x] states,
J. Chem. Phys., 2002, 117, 10, 4820, https://doi.org/10.1063/1.1498469
. [all data]
Feng, Wei, et al., 2004
Feng, L.; Wei, J.; Reisler, H.,
Rotationally Resolved Infrared Spectroscopy of the Hydroxymethyl Radical (CH,
J. Phys. Chem. A, 2004, 108, 39, 7903, https://doi.org/10.1021/jp040101+
. [all data]
Jacox, 1994
Jacox, M.E.,
Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]
Jacox, 1998
Jacox, M.E.,
Vibrational and electronic energy levels of polyatomic transient molecules: supplement A,
J. Phys. Chem. Ref. Data, 1998, 27, 2, 115-393, https://doi.org/10.1063/1.556017
. [all data]
Jacox, 2003
Jacox, M.E.,
Vibrational and electronic energy levels of polyatomic transient molecules: supplement B,
J. Phys. Chem. Ref. Data, 2003, 32, 1, 1-441, https://doi.org/10.1063/1.1497629
. [all data]
Pagsberg, Munk, et al., 1989
Pagsberg, P.; Munk, J.; Anastasi, C.; Simpson, V.,
UV spectrum of CD2OD and its reactions with O2, NO and NO2,
Chem. Phys. Lett., 1989, 157, 3, 271, https://doi.org/10.1016/0009-2614(89)87246-X
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Vibrational and/or electronic energy levels, References
- Symbols used in this document:
ΔfH°gas Enthalpy of formation of gas at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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