Methylketene
- Formula: C3H4O
- Molecular weight: 56.0633
- IUPAC Standard InChI: InChI=1S/C3H4O/c1-2-3-4/h2H,1H3
- IUPAC Standard InChIKey: UYLUJGRCKKSWHS-UHFFFAOYSA-N
- CAS Registry Number: 6004-44-0
- 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. - Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- 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.
Data compiled by: Glushko Thermocenter, Russian Academy of Sciences, Moscow
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 36.8 | 50. | Thermodynamics Research Center, 1997 | |
| 45.8 | 100. | ||
| 53.0 | 150. | ||
| 59.2 | 200. | ||
| 68.3 | 273.15 | ||
| 71.4 | 298.15 | ||
| 71.7 | 300. | ||
| 84.1 | 400. | ||
| 95.5 | 500. | ||
| 105.5 | 600. | ||
| 114.1 | 700. | ||
| 121.7 | 800. | ||
| 128.2 | 900. | ||
| 133.9 | 1000. | ||
| 138.8 | 1100. | ||
| 143.1 | 1200. | ||
| 146.8 | 1300. | ||
| 150.0 | 1400. | ||
| 152.8 | 1500. |
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:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
View reactions leading to C3H4O+ (ion structure unspecified)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| Proton affinity (review) | 834.1 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
| Quantity | Value | Units | Method | Reference | Comment |
| Gas basicity | 803.4 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 8.95 | PE | Bock, Hirabayashi, et al., 1981 | Vertical value; LLK |
| 8.95 | PE | Bock, Hirabayashi, et al., 1977 | Vertical value; LLK |
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.
Thermodynamics Research Center, 1997
Thermodynamics Research Center,
Selected Values of Properties of Chemical Compounds., Thermodynamics Research Center, Texas A&M University, College Station, Texas, 1997. [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]
Bock, Hirabayashi, et al., 1981
Bock, H.; Hirabayashi, T.; Mohmand, S.,
Thermische erzeugung von alkyl- und halogenketenen,
Chem. Ber., 1981, 114, 2595. [all data]
Bock, Hirabayashi, et al., 1977
Bock, H.; Hirabayashi, T.; Mohmand, S.; Solouki, B.,
Instabile Zwischenprodukte in der Gasphase: Der thermische Zerfall von Carbonsaurechloriden RCOCl,
Angew. Chem., 1977, 89, 106. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
Cp,gas Constant pressure heat capacity of gas - 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.