MeCH=NO2 anion

Formula: C₂H₄NO₂^-
Molecular weight: 74.0592
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Other data available:
- Gas phase ion energetics data
- Ion clustering data
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Reaction thermochemistry data

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Individual Reactions

C₂H₄NO₂^- + =

By formula: C₂H₄NO₂^- + H⁺ = C₂H₅NO₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1489. ± 9.2	kJ/mol	G+TS	Bartmess, Scott, et al., 1979	gas phase; value altered from reference due to change in acidity scale
Δ_rH°	1496. ± 12.	kJ/mol	G+TS	Cumming and Kebarle, 1978	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1462. ± 8.4	kJ/mol	IMRE	Bartmess, Scott, et al., 1979	gas phase; value altered from reference due to change in acidity scale
Δ_rG°	1469. ± 8.4	kJ/mol	IMRE	Cumming and Kebarle, 1978	gas phase

C₂H₄NO₂^- + = C₄H₉N₂O₄^-

By formula: C₂H₄NO₂^- + C₂H₅NO₂ = C₄H₉N₂O₄^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	67.8 ± 3.3	kJ/mol	TDAs	Wincel, 2004	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	37.7	kJ/mol	TDAs	Wincel, 2004	gas phase

References

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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]

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, 2004
Wincel, H., Gas-phase clustering reactions of NO2-, C2H3NO2-, C2H4NO2-C2H5NO2- and C2H5NO4- with C2H5NO2, Int. J. Mass Spectrom., 2004, 232, 2, 185-194, https://doi.org/10.1016/j.ijms.2004.01.003 . [all data]

Notes

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Symbols used in this document:

Δ_rG° Free energy of reaction at standard conditions

Δ_rH° Enthalpy of reaction at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions