p-pyridinide anion
- Formula: C5H4N-
- Molecular weight: 78.0925
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Gas phase ion energetics 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
Electron affinity of neutral species
EAneutral (eV) | Method | Reference | Comment |
---|---|---|---|
1.480 ± 0.020 | N/A | Culberson, Blackstone, et al., 2013 | |
1.4800 ± 0.0060 | LPES | Wren, Vogelhuber, et al., 2012 | |
1.59 ± 0.19 | D-EA | Schafman and Wenthold, 2007 | |
1.54 ± 0.20 | D-EA | Meot-ner and Kafafi, 1988 | anchored to 88MEO scale, not the "87 acidity scale". The Kiefer, Zhang, et al., 1997 BDE is for ortho. |
2.411 ± 0.030 | SI | Failes, Joyce, et al., 1976 | The Magnetron method, lacking mass analysis, is not considered reliable. |
Protonation reactions
By formula: C5H4N- + H+ = C5H5N
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 389.9 ± 2.0 | kcal/mol | IMRE | Schafman and Wenthold, 2007 | gas phase |
ΔrH° | 391.0 ± 2.5 | kcal/mol | TDEq | Meot-ner and Kafafi, 1988 | gas phase; anchored to 88MEO scale, not the "87 acidity scale". The Kiefer, Zhang, et al., 1997 BDE is for ortho. |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 382.7 ± 2.0 | kcal/mol | TDEq | Meot-ner and Kafafi, 1988 | gas phase; anchored to 88MEO scale, not the "87 acidity scale". The Kiefer, Zhang, et al., 1997 BDE is for ortho. |
ΔrG° | 384.0 ± 3.0 | kcal/mol | IMRB | DePuy, Kass, et al., 1988 | gas phase; Comparable to water in acidity |
ΔrG° | <376.3 ± 2.0 | kcal/mol | IMRB | Bruins, Ferrer-Correia, et al., 1978 | gas phase; O- deprotonates |
References
Go To: Top, 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.
Culberson, Blackstone, et al., 2013
Culberson, L.M.; Blackstone, C.C.; Sanov, A.,
Photoelectron Angular Distributions of Pyridinide: A Benchmark Application of the Mixed s-p Model to a Truly Polyatomic Anion,
J. Phys. Chem. A, 2013, 117, 46, 11760-11765, https://doi.org/10.1021/jp402507v
. [all data]
Wren, Vogelhuber, et al., 2012
Wren, S.W.; Vogelhuber, K.M.; Garver, J.M.; Kato, S.; Sheps, L.; Bierbaum, V.M.; Lineberger, W.C.,
C-H Bond Strengths and Acidities in Aromatic Systems: Effects of Nitrogen Incorporation in Mono-, Di-, and Triazines,
J. Am. Chem. Soc., 2012, 134, 15, 6584-6595, https://doi.org/10.1021/ja209566q
. [all data]
Schafman and Wenthold, 2007
Schafman, B.S.; Wenthold, P.G.,
Regioselectivity of pyridine deprotonation in the gas phase,
J. Org. Chem., 2007, 72, 5, 1645-1651, https://doi.org/10.1021/jo062117x
. [all data]
Meot-ner and Kafafi, 1988
Meot-ner, M.; Kafafi, S.A.,
Carbon Acidities of Aromatic Compounds,
J. Am. Chem. Soc., 1988, 110, 19, 6297, https://doi.org/10.1021/ja00227a003
. [all data]
Kiefer, Zhang, et al., 1997
Kiefer, J.H.; Zhang, Q.; Kern, R.D.; Yao, J.; Jursic, B.,
Pyrolysis of Aromatic Azines: Pyrazine, Pyrimidine, and Pyridine,
J. Phys. Chem. A, 1997, 101, 38, 7061, https://doi.org/10.1021/jp970211z
. [all data]
Failes, Joyce, et al., 1976
Failes, R.L.; Joyce, J.T.; Walton, E.C.,
The behaviour of some dimethyl and trimethyl substituted pyridines in the magnetron,
J. Phys. D: Appl. Phys., 1976, 9, 1543. [all data]
DePuy, Kass, et al., 1988
DePuy, C.H.; Kass, S.R.; Bean, G.P.,
Formation and Reactions of Heteroaromatic Anions in the Gas Phase,
J. Org. Chem., 1988, 53, 19, 4427, https://doi.org/10.1021/jo00254a001
. [all data]
Bruins, Ferrer-Correia, et al., 1978
Bruins, A.P.; Ferrer-Correia, A.J.; Harrison, A.G.; Jennings, K.R.; Mithcum, R.K.,
Negative ion chemical ionization mass spectrometry of some aromatic compounds using O-. as the reagent ion,
Adv. Mass Spectrom., 1978, 7, 355. [all data]
Notes
Go To: Top, Gas phase ion energetics data, References
- Symbols used in this document:
EAneutral Electron affinity of neutral species 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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