NH2 Anion - The NIST WebBook

NH2 anion

• Formula: H2N-
• Molecular weight: 16.0231
• CAS Registry Number: 17655-31-1
• Information on this page:
  • Ion clustering data
  • References
  • Notes
• Other data available:
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • Vibrational and/or electronic energy levels
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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

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Clustering reactions

(H2N- • 4294967295) + = H2N-

By formula: (H2N- • 4294967295HN) + HN = H2N-

Quantity	Value	Units	Method	Reference	Comment
ΔrH°	389.9 ± 2.0	kJ/mol	N/A	Wickham-Jones, Ervin, et al., 1989	gas phase
ΔrH°	244.2 ± 4.1	kJ/mol	Ther	MacKay, Hemsworth, et al., 1976	gas phase

H2N- + = (H2N- • )

By formula: H2N- + H3N = (H2N- • H3N)

Quantity	Value	Units	Method	Reference	Comment
ΔrH°	50.21	kJ/mol	PDis	Snodgrass, Coe, et al., 1989	gas phase

(H2N- • ) + = (H2N- • 2)

By formula: (H2N- • H3N) + H3N = (H2N- • 2H3N)

Quantity	Value	Units	Method	Reference	Comment
ΔrH°	46.44	kJ/mol	Est	Snodgrass, Coe, et al., 1989	gas phase; Affinity: shift in apparent EA from lesser-solvated ion. Ignores any neutral-neutral bond.

References

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Wickham-Jones, Ervin, et al., 1989 Wickham-Jones, C.T.; Ervin, K.M.; Ellison, G.B.; Lineberger, W.C., NH2 Electron Affinity, J. Chem. Phys., 1989, 91, 4, 2762, https://doi.org/10.1063/1.456994 . [all data]

MacKay, Hemsworth, et al., 1976 MacKay, G.J.; Hemsworth, R.S.; Bohme, D.K., Absolute gas-phase acidities of CH3NH2, C2H5NH2, (CH3)2NH, and (CH3)3N, Can. J. Chem., 1976, 54, 1624. [all data]

Snodgrass, Coe, et al., 1989 Snodgrass, J.T.; Coe, J.V.; Freidhoff, C.B.; McHugh, K.M.; Bowen, K.H., Photoelectron Spectroscopy of the Negative Cluster Ions, NH2-(NH3)n=1,2, J. Chem. Phys., 1989, 92, xxxx. [all data]

Notes

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• Symbols used in this document:

  ΔrH°	Enthalpy of reaction at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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