CH2=CHO anion
- Formula: C2H3O-
- Molecular weight: 43.0452
- CAS Registry Number: 35731-40-9
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Ion clustering data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
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Clustering reactions
(C2H3O- • 4294967295) +
= C2H3O-
By formula: (C2H3O- • 4294967295C2H2O) + C2H2O = C2H3O-
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 257. ± 9.6 | kJ/mol | N/A | Bartmess, Scott, et al., 1979 | gas phase; Acid: ethanal. The enol is 9.6 kcal/mol more acidic: Holmes and Lossing, 1982; value altered from reference due to change in acidity scale; B |
C2H3O- + = (C2H3O- •
)
By formula: C2H3O- + H2O = (C2H3O- • H2O)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 64.4 ± 4.2 | kJ/mol | TDAs | Meot-ner, 1988 | gas phase; B,M |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrS° | 81.6 | J/mol*K | PHPMS | Meot-ner, 1988 | gas phase; M |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrG° | 40. ± 4.2 | kJ/mol | TDAs | Meot-ner, 1988 | gas phase; B |
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.
Bartmess, Scott, et al., 1979
Bartmess, J.E.; Scott, J.A.; McIver, R.T., Jr.,
The gas phase acidity scale from methanol to phenol,
J. Am. Chem. Soc., 1979, 101, 6047. [all data]
Holmes and Lossing, 1982
Holmes, J.L.; Lossing, F.P.,
Heats of formation of the ionic and neutral enols of acetaldehyde and acetone,
J. Am. Chem. Soc., 1982, 104, 2648. [all data]
Meot-ner, 1988
Meot-ner, M.,
The Ionic Hydrogen Bond and Solvation. 7. Interaction Energies of Carbanions with Solvent Molecules,
J. Am. Chem. Soc., 1988, 110, 12, 3858, https://doi.org/10.1021/ja00220a022
. [all data]
Notes
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- Symbols used in this document:
ΔrG° Free energy of reaction at standard conditions 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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