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+
- 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:
Ion clustering 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. Searches may be limited to ion clustering reactions. A general reaction search form is also available.
Clustering reactions
+
= (
•
)
By formula: CHO+ + CO = (CHO+ • CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 10.8 | kcal/mol | PHPMS | Jennings, Headley, et al., 1982 | gas phase |
| ΔrH° | 12.8 | kcal/mol | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
| ΔrH° | 11.7 | kcal/mol | PHPMS | Meot-Ner (Mautner) and Field, 1974 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 22.5 | cal/mol*K | PHPMS | Jennings, Headley, et al., 1982 | gas phase |
| ΔrS° | 24. | cal/mol*K | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
| ΔrS° | 20.9 | cal/mol*K | PHPMS | Meot-Ner (Mautner) and Field, 1974 | gas phase |
( •
) +
= (
• 2
)
By formula: (CHO+ • CO) + CO = (CHO+ • 2CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 4.9 ± 0.3 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrH° | 6.6 | kcal/mol | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 15.0 | cal/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrS° | 24. | cal/mol*K | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
( • 2
) +
= (
• 3
)
By formula: (CHO+ • 2CO) + CO = (CHO+ • 3CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 4.7 ± 0.3 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrH° | 6.3 | kcal/mol | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 15.8 | cal/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrS° | 26. | cal/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° | 4.5 ± 0.3 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrH° | 6.2 | kcal/mol | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 18.2 | cal/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrS° | 29. | cal/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° | 4.2 ± 0.3 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrH° | 5.8 | kcal/mol | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 22.9 | cal/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| ΔrS° | 32. | cal/mol*K | PHPMS | Hiraoka, Saluja, et al., 1979 | gas phase |
( • 5
) +
= (
• 6
)
By formula: (CHO+ • 5CO) + CO = (CHO+ • 6CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 2.4 ± 0.3 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 19.0 | cal/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° | 2.3 ± 0.3 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 21.1 | cal/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° | 2.2 ± 0.3 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 22.0 | cal/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° | 2.1 ± 0.3 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 22.6 | cal/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° | 2.0 ± 0.3 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 22.3 | cal/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
( • 10
) +
= (
• 11
)
By formula: (CHO+ • 10CO) + CO = (CHO+ • 11CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 2.0 ± 0.3 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 23.0 | cal/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° | 1.9 ± 0.3 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 23.2 | cal/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° | 1.8 ± 0.3 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 23.2 | cal/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° | 1.8 ± 0.3 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 23.1 | cal/mol*K | PHPMS | Hiraoka and Mori, 1989 | gas phase |
( • 14
) +
= (
• 15
)
By formula: (CHO+ • 14CO) + CO = (CHO+ • 15CO)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 1.76 | kcal/mol | PHPMS | Hiraoka and Mori, 1989 | gas phase; Entropy change calculated or estimated |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 23. | cal/mol*K | N/A | Hiraoka and Mori, 1989 | gas phase; Entropy change calculated or estimated |
+
= (
•
)
By formula: CHO+ + CO2 = (CHO+ • CO2)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 12.6 | kcal/mol | PHPMS | Hiraoka, Shoda, et al., 1986 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 21.4 | cal/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° | 7.2 | kcal/mol | PHPMS | Hiraoka, Shoda, et al., 1986 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 19.7 | cal/mol*K | PHPMS | Hiraoka, Shoda, et al., 1986 | gas phase |
( • 2
) +
= (
• 3
)
By formula: (CHO+ • 2CO2) + CO2 = (CHO+ • 3CO2)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 6.9 | kcal/mol | PHPMS | Hiraoka, Shoda, et al., 1986 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 22.7 | cal/mol*K | PHPMS | Hiraoka, Shoda, et al., 1986 | gas phase |
( • 3
) +
= (
• 4
)
By formula: (CHO+ • 3CO2) + CO2 = (CHO+ • 4CO2)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 8.4 | kcal/mol | PHPMS | Hiraoka, Shoda, et al., 1986 | gas phase; Entropy change calculated or estimated |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 24. | cal/mol*K | N/A | Hiraoka, Shoda, et al., 1986 | gas phase; Entropy change calculated or estimated |
+
= (
•
)
By formula: CHO+ + H2 = (CHO+ • H2)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 3.9 | kcal/mol | PHPMS | Hiraoka and Kebarle, 1975 | gas phase |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 20.5 | cal/mol*K | PHPMS | Hiraoka and Kebarle, 1975 | gas phase |
References
Go To: Top, Ion clustering 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, Ion clustering 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
- 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.