CH2=NO2 anion
- Formula: CH2NO2-
- Molecular weight: 60.0326
- CAS Registry Number: 18137-96-7
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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 |
---|---|---|---|
2.475 ± 0.010 | LPES | Metz, Cyr, et al., 1991 | |
2.55 ± 0.24 | D-EA | Bartmess, Scott, et al., 1979 | value altered from reference due to change in acidity scale |
<2.35996 | IMRB | MacKay and Bohme, 1978 | EA: < NO2 |
0.499686 | EIAE | Tsuda, Yokohata, et al., 1969 | From CH3NO2 |
Protonation reactions
By formula: CH2NO2- + H+ = CH3NO2
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 358.0 ± 5.0 | kcal/mol | D-EA | Metz, Cyr, et al., 1991 | gas phase |
ΔrH° | 356.4 ± 2.2 | kcal/mol | G+TS | Bartmess, Scott, et al., 1979 | gas phase; value altered from reference due to change in acidity scale |
ΔrH° | 357.4 ± 2.9 | kcal/mol | G+TS | Cumming and Kebarle, 1978 | gas phase |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 349.7 ± 2.0 | kcal/mol | IMRE | Bartmess, Scott, et al., 1979 | gas phase; value altered from reference due to change in acidity scale |
ΔrG° | 350.7 ± 2.0 | kcal/mol | IMRE | Cumming and Kebarle, 1978 | gas phase |
ΔrG° | 350.7 ± 2.0 | kcal/mol | IMRE | MacKay and Bohme, 1978 | gas phase; EA: < NO2 |
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
CH2NO2- + = C2H5N2O4-
By formula: CH2NO2- + CH3NO2 = C2H5N2O4-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 15.90 ± 0.50 | kcal/mol | TDAs | Wincel, 2003 | gas phase |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 8.40 | kcal/mol | TDAs | Wincel, 2003 | gas phase |
References
Go To: Top, Gas phase ion energetics 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.
Metz, Cyr, et al., 1991
Metz, R.B.; Cyr, D.R.; Neumark, D.M.,
Study of the 2B1 and 2A2 States of CH2NO2 via Ultraviolet Photoelectron Spectroscopy of the CH2NO2- Anion,
J. Phys. Chem., 1991, 95, 7, 2900, https://doi.org/10.1021/j100160a047
. [all data]
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]
MacKay and Bohme, 1978
MacKay, G.I.; Bohme, D.K.,
Proton-Transfer Reactions in Nitromethane at 297K,
Int. J. Mass Spectrom. Ion Phys., 1978, 26, 4, 327, https://doi.org/10.1016/0020-7381(78)80052-7
. [all data]
Tsuda, Yokohata, et al., 1969
Tsuda, S.; Yokohata, A.; Kawai, M.,
Measurement of Negative Ions formed by Electron Impact. II. The Ionization Efficiency Curves of Negative Nitro, Oxygen Atoms, and Nitromethylene Ions from Nitroalkanes.,
Bull. Chem. Soc. Japan, 1969, 42, 3, 614, https://doi.org/10.1246/bcsj.42.614
. [all data]
Cumming and Kebarle, 1978
Cumming, J.B.; Kebarle, P.,
Summary of gas phase measurements involving acids AH. Entropy changes in proton transfer reactions involving negative ions. Bond dissociation energies D(A-H) and electron affinities EA(A),
Can. J. Chem., 1978, 56, 1. [all data]
Wincel, 2003
Wincel, H.,
Gas-phase Solvation of Cl-, NO2-, CH2NO2-, CH3NO2-, and CH3NO4- by CH3NO2,
Int. J. Mass Spectrom., 2003, 226, 3, 341-353, https://doi.org/10.1016/S1387-3806(03)00066-6
. [all data]
Notes
Go To: Top, Gas phase ion energetics data, Ion clustering 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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