H2C=C radical anion
- Formula: C2H2-
- Molecular weight: 26.0378
- CAS Registry Number: 66295-36-1
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Gas phase thermochemistry 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 by: John E. Bartmess
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | 92.0 ± 3.6 | kcal/mol | R-EA | Ervin, Gronert, et al., 1990 | Vinylidene neutral: ΔHf<=99±2 kcal, Kiefer, Sidhu, et al., 1989 |
ΔfH°gas | 61. ± 35. | kcal/mol | IMRB | Dawson and Nibbering, 1978 | |
ΔfH°gas | 61. ± 35. | kcal/mol | IMRB | Dawson and Jennings, 1976 | O- + C2H4 ->, C2H2- + N2O -> CH2CN- |
Reaction thermochemistry 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 by: John E. Bartmess
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
(C2H2- • 4294967295) +
= C2H2-
By formula: (C2H2- • 4294967295C2H) + C2H = C2H2-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 78.5 ± 3.6 | kcal/mol | N/A | Ervin, Gronert, et al., 1990 | gas phase; Vinylidene neutral: ΔHf<=99±2 kcal, Kiefer, Sidhu, et al., 1989 |
ΔrH° | 44.6 ± 3.3 | kcal/mol | Ther | Guo and Grabowski, 1990 | gas phase; Between PhF, Me3P |
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 by: John E. Bartmess
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
(C2H2- • 4294967295) +
= C2H2-
By formula: (C2H2- • 4294967295C2H) + C2H = C2H2-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 78.5 ± 3.6 | kcal/mol | N/A | Ervin, Gronert, et al., 1990 | gas phase; Vinylidene neutral: ΔHf<=99±2 kcal, Kiefer, Sidhu, et al., 1989 |
ΔrH° | 44.6 ± 3.3 | kcal/mol | Ther | Guo and Grabowski, 1990 | gas phase; Between PhF, Me3P |
References
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Ion clustering data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Ervin, Gronert, et al., 1990
Ervin, K.M.; Gronert, S.; Barlow, S.E.; Gilles, M.K.; Harrison, A.G.; Bierbaum, V.M.; DePuy, C.H.; Lin, W.C.,
Bonds Strengths of Ethylene and Acetylene,
J. Am. Chem. Soc., 1990, 112, 15, 5750, https://doi.org/10.1021/ja00171a013
. [all data]
Kiefer, Sidhu, et al., 1989
Kiefer, J.H.; Sidhu, S.S.; Kumaran, S.S.; Irdan, E.A.,
RRKM Model of C2H4 Dissociation: Heat of Formation of Vinylidene,
Chem. Phys. Lett., 1989, 159, 1, 32, https://doi.org/10.1016/S0009-2614(89)87448-2
. [all data]
Dawson and Nibbering, 1978
Dawson, J.H.J.; Nibbering, N.M.M.,
Concerning CH2=C-. and its reaction with 14N 15NO,
J. Am. Chem. Soc., 1978, 100, 1928. [all data]
Dawson and Jennings, 1976
Dawson, J.H.J.; Jennings, K.R.,
Production of gas phase radical anions by reaction of O-. Ions with organic substrates,
J. Chem. Soc. Faraday Trans. 2, 1976, 72, 700. [all data]
Guo and Grabowski, 1990
Guo, Y.; Grabowski, J.J.,
Gas Phase Ion Chemistry of the Vinylidene Radical Anion and the Acidity of the Vinyl Radical,
Int. J. Mass Spectrom. Ion Proc., 1990, 97, 3, 253, https://doi.org/10.1016/0168-1176(90)85003-K
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Ion clustering data, References
- Symbols used in this document:
ΔfH°gas Enthalpy of formation of gas at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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