Carbon anion
- Formula: C2-
- Molecular weight: 24.0219
- IUPAC Standard InChIKey: LGRLWUINFJPLSH-UHFFFAOYSA-N
- CAS Registry Number: 50802-47-6
- Chemical structure:
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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 as indicated in comments:
B - John E. Bartmess
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | 119.3 ± 3.8 | kcal/mol | R-EA | Ervin, Gronert, et al., 1990 | B |
ΔfH°gas | <197.5 ± 4.6 | kcal/mol | EIAE | Collin and Locht, 1970 | From ketene; B |
Quantity | Value | Units | Method | Reference | Comment |
S°gas,1 bar | 46.989 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1969 |
Reaction thermochemistry 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 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
+
= C2H
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | >349.0 ± 3.6 | kcal/mol | D-EA | Arnold, Bradforth, et al., 1991 | gas phase |
ΔrH° | <375.8 ± 2.3 | kcal/mol | G+TS | Schiff and Bohme, 1975 | gas phase; No reaction with acetylene |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | >341.7 ± 3.8 | kcal/mol | H-TS | Arnold, Bradforth, et al., 1991 | gas phase |
ΔrG° | <368.5 ± 2.0 | kcal/mol | IMRB | Schiff and Bohme, 1975 | gas phase; No reaction with acetylene |
References
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry 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]
Collin and Locht, 1970
Collin, J.E.; Locht, R.,
Positive and negative ion formation in ketene by electron impact,
Intern. J. Mass Spectrom. Ion Phys., 1970, 3, 465. [all data]
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Arnold, Bradforth, et al., 1991
Arnold, D.W.; Bradforth, S.E.; Kitsopoulos, T.N.; Neumark, D.M.,
Vibrationally Resolved Spectra of C2-C11 by Anion Photoelectron Spectroscopy,
J. Chem. Phys., 1991, 95, 12, 8753, https://doi.org/10.1063/1.461211
. [all data]
Schiff and Bohme, 1975
Schiff, H.I.; Bohme, D.K.,
Flowing afterglow studies at York University,
Int. J. Mass Spectrom. Ion Phys., 1975, 16, 167. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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