NCCðCCðC anion
- Formula: C5N-
- Molecular weight: 74.0607
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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
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Individual Reactions
C5N- + = C5HN
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 344.0 ± 5.1 | kcal/mol | D-EA | Yen, Garand, et al., 2010 | gas phase |
| ΔrH° | 393.6 ± 5.0 | kcal/mol | D-EA | Dibeler, Reese, et al., 1961 | gas phase; From HC≡C-(C≡C)2-C≡N. The derived acidity is ca. 40 kcal/mol too weak, based on homologs. |
Gas phase ion energetics data
Go To: Top, Reaction 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
Electron affinity of neutral species
| EAneutral (eV) | Method | Reference | Comment |
|---|---|---|---|
| 4.450 ± 0.030 | LPES | Yen, Garand, et al., 2010 | |
| 2.29999 | EIAE | Dibeler, Reese, et al., 1961 | From HC≡C-(C≡C)2-C≡N. The derived acidity is ca. 40 kcal/mol too weak, based on homologs. |
Protonation reactions
C5N- + = C5HN
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 344.0 ± 5.1 | kcal/mol | D-EA | Yen, Garand, et al., 2010 | gas phase |
| ΔrH° | 393.6 ± 5.0 | kcal/mol | D-EA | Dibeler, Reese, et al., 1961 | gas phase; From HC≡C-(C≡C)2-C≡N. The derived acidity is ca. 40 kcal/mol too weak, based on homologs. |
References
Go To: Top, Reaction 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.
Yen, Garand, et al., 2010
Yen, T.A.; Garand, E.; Shreve, A.T.; Neumark, D.M.,
Anion Photoelectron Spectroscopy of C3N- and C5N-,
J. Phys. Chem. A, 2010, 114, 9, 3215-3220, https://doi.org/10.1021/jp9093996
. [all data]
Dibeler, Reese, et al., 1961
Dibeler, V.H.; Reese, R.M.; Franklin, J.L.,
Mass spectrometric study of cyanogen and cyanoacetylenes,
J. Am. Chem. Soc., 1961, 83, 1813. [all data]
Notes
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
EAneutral Electron affinity of neutral species ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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