(H2O)2..(HO)2PO2 anion

Formula: H₆O₆P^-
Molecular weight: 133.0184
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Gas phase thermochemistry data

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Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	-593.71	kJ/mol	Ther	Blades, Ho, et al., 1996
Δ_fH°_gas	-597.06	kJ/mol	Ther	Blades, Klassen, et al., 1995	T: 293 K. ΔSaff approx. 24 cal/mol-K

Reaction thermochemistry data

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Data compiled by: John E. Bartmess

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Individual Reactions

H₄O₅P^- + 2 = H₆O₆P^-

By formula: H₄O₅P^- + 2H₂O = H₆O₆P^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	51.5 ± 4.2	kJ/mol	TDAs	Blades, Ho, et al., 1996	gas phase
Δ_rH°	54.8 ± 6.3	kJ/mol	TDAs	Blades, Klassen, et al., 1995	gas phase; T: 293 K. ΔSaff approx. 24 cal/mol-K
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	25.5 ± 2.1	kJ/mol	TDAs	Blades, Ho, et al., 1996	gas phase
Δ_rG°	25.5 ± 1.3	kJ/mol	TDAs	Blades, Klassen, et al., 1995	gas phase; T: 293 K. ΔSaff approx. 24 cal/mol-K

H₆O₆P^- + 3 = H₈O₇P^-

By formula: H₆O₆P^- + 3H₂O = H₈O₇P^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	51.5 ± 4.2	kJ/mol	TDAs	Blades, Ho, et al., 1996, 2	gas phase
Δ_rH°	49.4 ± 6.3	kJ/mol	TDAs	Blades, Klassen, et al., 1995	gas phase; T: 293 K. ΔSaff approx. 24 cal/mol-K
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	26. ± 4.2	kJ/mol	TDAs	Blades, Ho, et al., 1996, 2	gas phase
Δ_rG°	20.1 ± 1.3	kJ/mol	TDAs	Blades, Klassen, et al., 1995	gas phase; T: 293 K. ΔSaff approx. 24 cal/mol-K

References

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Blades, Ho, et al., 1996
Blades, A.T.; Ho, Y.; Kebarle, P., Hydration in the Gas Phase of the Orthophosphate Anion (HO)2PO2-, and the Conversion of the Orthophosphate anion to the Metaphosphate, PO3-, Ion, J. Am. Chem. Soc., 1996, 118, 1, 196, https://doi.org/10.1021/ja952169w . [all data]

Blades, Klassen, et al., 1995
Blades, A.T.; Klassen, J.S.; Kebarle, P., Free Energies of Hydration in the Gas Phase on the Anions of Some Oxo Acids of C, N, S, P, Cl and I, J. Am. Chem. Soc., 1995, 117, 42, 10563, https://doi.org/10.1021/ja00147a019 . [all data]

Blades, Ho, et al., 1996, 2
Blades, A.T.; Ho, Y.; Kebarle, P., Free Energies of Hydration in the Gas Phase of Some Phosphate Singly and Doubly Charged Anions: orthophosphate, diphosphate, Ribose-5-phosphate, Adenosine-5'-phosphate and Adenosine-5'-Dipho, J. Phys. Chem., 1996, 100, 6, 2443, https://doi.org/10.1021/jp952032s . [all data]

Notes

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Symbols used in this document:

Δ_fH°_gas Enthalpy of formation of gas at standard conditions

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_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions