Phosphorus pentafluoride
- Formula: F5P
- Molecular weight: 125.965778
- IUPAC Standard InChI: InChI=1S/F5P/c1-6(2,3,4)5
- IUPAC Standard InChIKey: OBCUTHMOOONNBS-UHFFFAOYSA-N
- CAS Registry Number: 7647-19-0
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Phosphorus(V) fluoride; PF5; Phosphorane, pentafluoro-; UN 2198; Phosphorus fluoride
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Reaction thermochemistry 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 as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
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Individual Reactions
+
= (
•
)
By formula: F- + F5P = (F- • F5P)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 329. ± 14. | kJ/mol | TDAs | Aleshina, Borshchevskii, et al., 1996 | gas phase; The discrepancy with Larson and McMahon, 1985 is discussed but not resolved.; value altered from reference due to conversion from electron convention to ion convention; B |
| ΔrH° | 360. ± 42. | kJ/mol | IMRE | Larson and McMahon, 1985 | gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M |
| ΔrH° | 423. ± 33. | kJ/mol | Ther | Mallouk, Rosenthal, et al., 1984 | gas phase; Fluoride affinities from this method appear to be consistently about 10 kcal/mol too bound; B |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrG° | 310. ± 42. | kJ/mol | IMRE | Larson and McMahon, 1985 | gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B |
References
Go To: Top, Reaction thermochemistry data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Aleshina, Borshchevskii, et al., 1996
Aleshina, V.E.; Borshchevskii, Ya.; Korobov, V.M.; Sidorov, L.N.,
The Enthalpy of Addition of the Fluorine Anion to the BF3 and PF5 Molecules,
Russ. J. Phys. Chem., 1996, 70, 1085. [all data]
Larson and McMahon, 1985
Larson, J.W.; McMahon, T.B.,
Fluoride and chloride affinities of the main group oxides, fluorides, oxofluorides, and alkyls. Quantitative scales of lewis acidities from ICR halide exchange equilibria,
J. Am. Chem. Soc., 1985, 107, 766. [all data]
Wenthold and Squires, 1995
Wenthold, P.G.; Squires, R.R.,
Bond dissociation energies of F2(-) and HF2(-). A gas-phase experimental and G2 theoretical study,
J. Phys. Chem., 1995, 99, 7, 2002, https://doi.org/10.1021/j100007a034
. [all data]
Mallouk, Rosenthal, et al., 1984
Mallouk, T.E.; Rosenthal, G.L.; Muller, G.; Brusasco, R.; Bartlett, N.,
Fluoride ion affinities of GeF4 and BF4 from thermodynamic and structural data for (SF2)2GeF6, ClO2GeF5, and ClO2BF4,
Inorg. Chem., 1984, 23, 3167. [all data]
Notes
Go To: Top, Reaction thermochemistry data, References
- Symbols used in this document:
ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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