NF2 anion

Formula: F₂N^-
Molecular weight: 52.0041
CAS Registry Number: 37366-64-6
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Reaction thermochemistry data

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Individual Reactions

F₂N^- + =

By formula: F₂N^- + H⁺ = HF₂N

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1552. ± 8.8	kJ/mol	G+TS	Koppel, Taft, et al., 1994	gas phase; Exptl, not interpolated dHf(F2NH) from Gurvich, Veyts, et al., is used. It agrees far better with MO calns
Δ_rH°	1506. ± 8.8	kJ/mol	IMRE	Koppel, Pikver, et al., 1981	gas phase; This acidity disagrees with the authors' later( Koppel, Taft, et al., 1994) value by 10 kcal/mol, but agrees with G3(MP2) computations much better.The acidity of HNF2 is not well known therefore.
Δ_rH°	1530. ± 15.	kJ/mol	D-EA	Ruckhaberle, Lehmann, et al., 1997	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1520. ± 8.4	kJ/mol	IMRE	Koppel, Taft, et al., 1994	gas phase; Exptl, not interpolated dHf(F2NH) from Gurvich, Veyts, et al., is used. It agrees far better with MO calns
Δ_rG°	1474. ± 8.4	kJ/mol	H-TS	Koppel, Pikver, et al., 1981	gas phase; This acidity disagrees with the authors' later( Koppel, Taft, et al., 1994) value by 10 kcal/mol, but agrees with G3(MP2) computations much better.The acidity of HNF2 is not well known therefore.

Gas phase ion energetics data

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Data compiled by: John E. Bartmess

Protonation reactions

F₂N^- + =

By formula: F₂N^- + H⁺ = HF₂N

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1552. ± 8.8	kJ/mol	G+TS	Koppel, Taft, et al., 1994	gas phase; Exptl, not interpolated dHf(F2NH) from Gurvich, Veyts, et al., is used. It agrees far better with MO calns
Δ_rH°	1506. ± 8.8	kJ/mol	IMRE	Koppel, Pikver, et al., 1981	gas phase; This acidity disagrees with the authors' later( Koppel, Taft, et al., 1994) value by 10 kcal/mol, but agrees with G3(MP2) computations much better.The acidity of HNF2 is not well known therefore.
Δ_rH°	1530. ± 15.	kJ/mol	D-EA	Ruckhaberle, Lehmann, et al., 1997	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1520. ± 8.4	kJ/mol	IMRE	Koppel, Taft, et al., 1994	gas phase; Exptl, not interpolated dHf(F2NH) from Gurvich, Veyts, et al., is used. It agrees far better with MO calns
Δ_rG°	1474. ± 8.4	kJ/mol	H-TS	Koppel, Pikver, et al., 1981	gas phase; This acidity disagrees with the authors' later( Koppel, Taft, et al., 1994) value by 10 kcal/mol, but agrees with G3(MP2) computations much better.The acidity of HNF2 is not well known therefore.

Vibrational and/or electronic energy levels

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Data compiled by: Marilyn E. Jacox

State: X

Vib. sym.	No.	Approximate type of mode	cm^-1		Med.	Method	References


a₁	1	Sym. stretch	994.7	m	Ne	IR	Jacox and Thompson, 1995
	2	Bend	431	H	Ne	IR	Jacox and Thompson, 1995
b₂	3	Asym. stretch	862.4	s	Ne	IR	Jacox and Thompson, 1995

Additional references: Jacox, 1998, page 207

Notes

Medium

Strong

(1/2)(2ν)

References

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Koppel, Taft, et al., 1994
Koppel, I.A.; Taft, R.W.; Anvia, F.; Zhu, S.Z.; Hu, L.Q.; Sung, K.S.; Desmarteau, D.D.; Yagupolskii, L.M., The Gas-Phase Acidities of Very Strong Neutral Bronsted Acids, J. Am. Chem. Soc., 1994, 116, 7, 3047, https://doi.org/10.1021/ja00086a038 . [all data]

Gurvich, Veyts, et al.
Gurvich, L.V.; Veyts, I.V.; Alcock, C.B., Hemisphere Publishing, NY, 1989, V. 1 2, Thermodynamic Properties of Individual Substances, 4th Ed. [all data]

Koppel, Pikver, et al., 1981
Koppel, I.; Pikver, R.; Sugis, A.; Suurmaa, E.; Lippmaa, E., FTICR Study of Structure and Solvent Effects on Basicity of Some Anions in the Gas Phase, Org. Reac., 1981, 18, 3. [all data]

Ruckhaberle, Lehmann, et al., 1997
Ruckhaberle, N.; Lehmann, L.; Matejcik, S.; Illenberger, E.; Bouteiller, Y.; Periquet, V.; Museur, L.; Desfran, Free Electron Attachment and Rydberg Electron Transfer to NF3 Molecules and Clusters, J. Phys. Chem. A, 1997, 101, 51, 9942, https://doi.org/10.1021/jp972422+ . [all data]

Jacox and Thompson, 1995
Jacox, M.E.; Thompson, W.E., Matrix isolation study of the interaction of excited neon atoms with NF3. Infrared spectra of NF+3, NF+2, and NF-2, J. Chem. Phys., 1995, 102, 1, 6, https://doi.org/10.1063/1.469446 . [all data]

Jacox, 1998
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement A, J. Phys. Chem. Ref. Data, 1998, 27, 2, 115-393, https://doi.org/10.1063/1.556017 . [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