PO2 anion

Formula: O₂P^-
Molecular weight: 62.9731
CAS Registry Number: 20499-58-5
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Other data available:
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Gas phase ion energetics data

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Data compiled by: John E. Bartmess

Protonation reactions

O₂P^- + = HO₂P

By formula: O₂P^- + H⁺ = HO₂P

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1376. ± 18.	kJ/mol	D-EA	N/A	gas phase
Δ_rH°	1376. ± 17.	kJ/mol	Endo	Viggiano, Morris, et al., 1991	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1349. ± 18.	kJ/mol	H-TS	Viggiano, Morris, et al., 1991	gas phase

Vibrational and/or electronic energy levels

Go To: Top, Gas phase ion energetics data, References, Notes

Data compiled by: Marilyn E. Jacox

State: ?

Energy (cm^-1)	Med.	References


T_d = 27600 ± 80	gas	Xu, de Beer, et al., 1996

State: X

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


a₁	2	Bend	520	T	gas	PE	Xu, de Beer, et al., 1996
b₂	3	PO a-stretch	1198.6		Ar	IR	Mielke, McCluskey, et al., 1990 Bauschlicher, Zhou, et al., 2000

Additional references: Jacox, 1994, page 103; Jacox, 1998, page 199; Jacox, 2003, page 141

Notes

Tentative assignment or approximate value

Photodissociation threshold

References

Go To: Top, Gas phase ion energetics data, Vibrational and/or electronic energy levels, Notes

Viggiano, Morris, et al., 1991
Viggiano, A.A.; Morris, R.A.; Dale, F.; Paulson, J.F.; Henshman, M.J.; Miller, T.M.; Miller, S., The Gas Phase Acidities of HPO3 and HPO2: Enthalpies of Deprotonation, J. Phys. Chem., 1991, 95, 3, 1275, https://doi.org/10.1021/j100156a044 . [all data]

Xu, de Beer, et al., 1996
Xu, C.; de Beer, E.; Neumark, D.M., Photoelectron spectroscopy of PO-2, J. Chem. Phys., 1996, 104, 7, 2749, https://doi.org/10.1063/1.470983 . [all data]

Mielke, McCluskey, et al., 1990
Mielke, Z.; McCluskey, M.; Andrews, L., Matrix reactions of P2 and O3 molecules, Chem. Phys. Lett., 1990, 165, 2-3, 146, https://doi.org/10.1016/0009-2614(90)85420-H . [all data]

Bauschlicher, Zhou, et al., 2000
Bauschlicher, C.W., Jr.; Zhou, M.; Andrews, L., A Study of the Products of the Reaction of Phosphorus and Dioxygen, J. Phys. Chem. A, 2000, 104, 16, 3566, https://doi.org/10.1021/jp993623b . [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [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]

Jacox, 2003
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement B, J. Phys. Chem. Ref. Data, 2003, 32, 1, 1-441, https://doi.org/10.1063/1.1497629 . [all data]

Notes

Go To: Top, Gas phase ion energetics data, Vibrational and/or electronic energy levels, References

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