Formyl cation
- Formula: CHO+
- Molecular weight: 29.0175
- IUPAC Standard InChI: InChI=1S/CHO/c1-2/h1H/q+1
- IUPAC Standard InChIKey: XPRMKTHGXOVKEH-UHFFFAOYSA-N
- CAS Registry Number: 17030-74-9
- 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: Formyl, unipositive ion; Methylium, oxo-; HCO; HCO+
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Reaction thermochemistry data
Go To: Top, 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: Michael M. Meot-Ner (Mautner) and Sharon G. Lias
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
+
= (
•
)
By formula: CHO+ + CO = (CHO+ • CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 45.2 | kJ/mol | PHPMS | Jennings, Headley, et al., 1982 | gas phase |
| ΔrH° | 53.6 | kJ/mol | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
| ΔrH° | 49.0 | kJ/mol | PHPMS | Meot-Ner (Mautner) and Field, 1974 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 94.1 | J/mol*K | PHPMS | Jennings, Headley, et al., 1982 | gas phase |
| ΔrS° | 100. | J/mol*K | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
| ΔrS° | 87.4 | J/mol*K | PHPMS | Meot-Ner (Mautner) and Field, 1974 | gas phase |
( • 2
) +
= (
• 3
)
By formula: (CHO+ • 2CO) + CO = (CHO+ • 3CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 19. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrH° | 26. | kJ/mol | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 66.1 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrS° | 110. | J/mol*K | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
( • 3
) +
= (
• 4
)
By formula: (CHO+ • 3CO) + CO = (CHO+ • 4CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 19. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrH° | 26. | kJ/mol | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 76.1 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrS° | 120. | J/mol*K | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
( • 4
) +
= (
• 5
)
By formula: (CHO+ • 4CO) + CO = (CHO+ • 5CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 18. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrH° | 24. | kJ/mol | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 95.8 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrS° | 130. | J/mol*K | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
( •
) +
= (
• 2
)
By formula: (CHO+ • CO) + CO = (CHO+ • 2CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 20. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrH° | 28. | kJ/mol | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 62.8 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrS° | 100. | J/mol*K | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
( • 14
) +
= (
• 15
)
By formula: (CHO+ • 14CO) + CO = (CHO+ • 15CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 7.36 | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; Entropy change calculated or estimated |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 96. | J/mol*K | N/A | Hiraoka and Mori, 1989 | gas phase; Entropy change calculated or estimated |
( • 3
) +
= (
• 4
)
By formula: (CHO+ • 3CO2) + CO2 = (CHO+ • 4CO2)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 35. | kJ/mol | PHPMS | Hiraoka, Shoda, et al., 1986 | gas phase; Entropy change calculated or estimated |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 100. | J/mol*K | N/A | Hiraoka, Shoda, et al., 1986 | gas phase; Entropy change calculated or estimated |
( • 10
) +
= (
• 11
)
By formula: (CHO+ • 10CO) + CO = (CHO+ • 11CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 8. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 96.2 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
( • 11
) +
= (
• 12
)
By formula: (CHO+ • 11CO) + CO = (CHO+ • 12CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 8. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 97.1 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
( • 12
) +
= (
• 13
)
By formula: (CHO+ • 12CO) + CO = (CHO+ • 13CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 8. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 97.1 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
( • 13
) +
= (
• 14
)
By formula: (CHO+ • 13CO) + CO = (CHO+ • 14CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 7. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 96.7 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
( • 9
) +
= (
• 10
)
By formula: (CHO+ • 9CO) + CO = (CHO+ • 10CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 8. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 93.3 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
( • 5
) +
= (
• 6
)
By formula: (CHO+ • 5CO) + CO = (CHO+ • 6CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 10. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 79.5 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
( • 6
) +
= (
• 7
)
By formula: (CHO+ • 6CO) + CO = (CHO+ • 7CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 9. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 88.3 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
( • 7
) +
= (
• 8
)
By formula: (CHO+ • 7CO) + CO = (CHO+ • 8CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 9. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 92.0 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
( • 8
) +
= (
• 9
)
By formula: (CHO+ • 8CO) + CO = (CHO+ • 9CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 9. ± 1. | kJ/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 94.6 | J/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
( • 2
) +
= (
• 3
)
By formula: (CHO+ • 2CO2) + CO2 = (CHO+ • 3CO2)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 29. | kJ/mol | PHPMS | Hiraoka, Shoda, et al., 1986 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 95.0 | J/mol*K | PHPMS | Hiraoka, Shoda, et al., 1986 | gas phase |
( •
) +
= (
• 2
)
By formula: (CHO+ • CO2) + CO2 = (CHO+ • 2CO2)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 30. | kJ/mol | PHPMS | Hiraoka, Shoda, et al., 1986 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 82.4 | J/mol*K | PHPMS | Hiraoka, Shoda, et al., 1986 | gas phase |
+
= (
•
)
By formula: CHO+ + H2 = (CHO+ • H2)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 16. | kJ/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 85.8 | J/mol*K | PHPMS | Hiraoka and Kebarle, 1975 | gas phase |
+
= (
•
)
By formula: CHO+ + CO2 = (CHO+ • CO2)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 52.7 | kJ/mol | PHPMS | Hiraoka, Shoda, et al., 1986 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 89.5 | J/mol*K | PHPMS | Hiraoka, Shoda, et al., 1986 | gas phase |
References
Go To: Top, Reaction thermochemistry data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Jennings, Headley, et al., 1982
Jennings, K.R.; Headley, J.V.; Mason, R.S.,
The Temperature Dependence of Ion - Molecule Association Reactions,
Int. J. Mass. Spectrom. Ion Phys, 1982, 45, 315. [all data]
Hiraoka, Saluja, et al., 1979
Hiraoka, K.; Saluja, P.P.S.; Kebarle, P.,
Stabilities of Complexes (N2)nH+, (CO)nH+ and (O2)nH+ for n = 1 to 7 Based on Gas Phase Ion Equilibrium Measurements,
Can. J. Chem., 1979, 57, 16, 2159, https://doi.org/10.1139/v79-346
. [all data]
Meot-Ner (Mautner) and Field, 1974
Meot-Ner (Mautner), M.; Field, F.H.,
Kinetics and Thermodynamics of the Association of CO+ with CO and of N2+ with N2 between 120 and 650 K,
J. Chem. Phys., 1974, 61, 9, 3742, https://doi.org/10.1063/1.1682560
. [all data]
Hiraoka and Mori, 1989
Hiraoka, K.; Mori, T.,
Gas Phase Stabilities of the Cluster Ions H+(CO)2(CO)n, H+(N2)2(N2)n and H+(O2)2(O2)n with n = 1 - 14,
Chem. Phys., 1989, 137, 1-3, 345, https://doi.org/10.1016/0301-0104(89)87119-8
. [all data]
Hiraoka, Shoda, et al., 1986
Hiraoka, K.; Shoda, T.; Morise, K.; Yamabe, S.; Kawai, E.; Hirao, K.,
Stability and structure of cluster ions in the gas phase: Carbon dioxide with Cl-, H3O+, HCO2+ and HCO+,
J. Chem. Phys., 1986, 84, 2091. [all data]
Hiraoka and Kebarle, 1975
Hiraoka, K.; Kebarle, P.,
Stability and Structure of H3CO+ Formed from COH+ + H2 at Low Temperature,
J. Chem. Phys., 1975, 63, 4, 1688, https://doi.org/10.1063/1.431499
. [all data]
Notes
Go To: Top, Reaction thermochemistry data, References
- Symbols used in this document:
ΔrH° Enthalpy of reaction at standard conditions ΔrS° Entropy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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