PO3 anion

Formula: O₃P^-
Molecular weight: 78.9725
CAS Registry Number: 15389-19-2
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Other data available:
- Reaction thermochemistry data
- Ion clustering data
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Gas phase ion energetics data

Electron affinity of neutral species

EA_neutral (eV)	Method	Reference	Comment
4.950 ± 0.060	LPES	Wang and Wang, 1999
4.42 ± 0.69	R-A	Rudnyi, Vovk, et al., 1986	They use ΔHf(PO3) = -121.9 ± 12.0 kcal/mol; value altered from reference due to conversion from electron convention to ion convention
3.49996	IMRB	Wormhoudt and Kobb, 1979

Protonation reactions

O₃P^- + =

By formula: O₃P^- + H⁺ = HPO₃

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	310.8 ± 4.2	kcal/mol	D-EA	Wang and Wang, 1999	gas phase
Δ_rH°	310.8 ± 2.6	kcal/mol	G+TS	Viggiano, Henchman, et al., 1992	gas phase
Δ_rH°	310.7 ± 3.6	kcal/mol	Endo	Viggiano, Morris, et al., 1991	gas phase
Δ_rH°	<316.3 ± 3.1	kcal/mol	G+TS	Henchman, Viggiano, et al., 1985	gas phase; The neutral thermochemistry appears to be in conflict with computational values
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	303.5 ± 4.3	kcal/mol	H-TS	Wang and Wang, 1999	gas phase
Δ_rG°	303.5 ± 2.5	kcal/mol	IMRB	Viggiano, Henchman, et al., 1992	gas phase
Δ_rG°	<309.0 ± 3.0	kcal/mol	IMRB	Henchman, Viggiano, et al., 1985	gas phase; The neutral thermochemistry appears to be in conflict with computational values

References

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Wang and Wang, 1999
Wang, X.B.; Wang, L.S., Vibrationally resolved photoelectron spectroscopy of PO3- and the electronic structure of PO3, Chem. Phys. Lett., 1999, 313, 1-2, 179-183, https://doi.org/10.1016/S0009-2614(99)00993-8 . [all data]

Rudnyi, Vovk, et al., 1986
Rudnyi, E.B.; Vovk, O.M.; Sidirov, L.N.; Sorokin, I.D.; Alikhanyan, A.S., Enthalpy of formation of PO₂^-, PO₃^-, and NaPO₂, High Temp., 1986, 24, 56. [all data]

Wormhoudt and Kobb, 1979
Wormhoudt, J.C.; Kobb, C.E., MS determination of negative and positive ion concentrations in coal fired MHD plasmas in Proc. 10th Materials Res. Symp. on Characterization of High Temp. Vapors, NBS Spec. Publ. U.S., 1979, 457. [all data]

Viggiano, Henchman, et al., 1992
Viggiano, A.A.; Henchman, M.J.; Dale, F.; Deakyne, C.A.; Paulson, J.F., Gas-Phase Reactions of Weak Bronsted Bases I-, PO3-, HSO4-, FSO3-, and CF3SO3- with Strong Bronsted Acids H2SO4, FSO3H, and CF3SO3H - A Quantitative Study, J. Am. Chem. Soc., 1992, 114, 11, 4299, https://doi.org/10.1021/ja00037a039 . [all data]

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]

Henchman, Viggiano, et al., 1985
Henchman, M.; Viggiano, A.A.; Paulson, J.F.; Freedman, A.; Wormhoudt, J., Thermodynamic and kinetic properties of the metaphosphate anion, PO₃^-, in the gas phase, J. Am. Chem. Soc., 1985, 107, 1453. [all data]

Notes

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

Symbols used in this document:

EA_neutral Electron affinity of neutral species

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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EA_neutral	Electron affinity of neutral species
Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions