Gold heptafluoride

Gold heptafluoride
Gold heptafluoride
Names
	IUPAC name Difluorinegold(V) fluoride
	Other names Gold heptafluoride
Identifiers
3D model (JSmol)	Interactive image ;
	InChI InChI=1S/Au.F2.5FH/c;1-2;;;;;/h;;5*1H/q+5;;;;;;/p-5 Key: IIWIEJHPIFUIKA-UHFFFAOYSA-I;
	SMILES F[Au](F)(F)(F)F.FF;
Properties
Chemical formula	AuF7
Molar mass	322.956 g/mol
Appearance	Pale-yellow solid
Melting point	100 °C (212 °F; 373 K) (decomposes)
Solubility in water	Reacts
Vapor pressure	>30 mmHg
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Corrosive, toxic
Related compounds
Other cations	ReF7, IF7
Related compounds	AuF3, AuF5
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Last updated May 06, 2025

Gold heptafluoride is a gold(V) compound with the empirical formula AuF₇. The synthesis of this compound from gold pentafluoride and a monatomic fluorine plasma was first reported in 1986.^[1] However, current calculations suggest that the structure of the synthesized molecule was actually a difluorine ligand on a gold pentafluoride core, AuF₅·F₂. That would make it the first difluorine complex and the first compound containing a fluorine atom with an oxidation state of zero. The gold(V)–difluorine complex is calculated to be 205 kJ/mol more stable than "true" gold(VII) fluoride. The vibrational frequency at 734 cm⁻¹ is the hallmark of the end-on coordinated difluorine molecule.^[2]

Gold heptafluoride decomposes at 100 °C to gold(V) fluoride releasing fluorine gas:^[1]

AuF₅·F₂ → AuF₅ + F₂

It also undergoes hydrolysis in water.^[1]

References

1 2 3 Timakov, A. A.; Prusakov, V. N.; Drobyshevskii, Y. V. (1986). "Gold heptafluoride" (PDF). Dokl. Akad. Nauk SSSR (in Russian). 291: 125–128. Archived from the original (PDF) on 30 June 2022. Retrieved 3 July 2022.
↑ Himmel, Daniel; Riedel, Sebastian (2007-05-31). "After 20 Years, Theoretical Evidence That "AuF₇" Is Actually AuF₅·F₂". Inorganic Chemistry. 46 (13): 5338–5342. doi:10.1021/ic700431s. PMID 17511450.

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[timakov-1] 1 2 3 Timakov, A. A.; Prusakov, V. N.; Drobyshevskii, Y. V. (1986). "Gold heptafluoride" (PDF). Dokl. Akad. Nauk SSSR (in Russian). 291: 125–128. Archived from the original (PDF) on 30 June 2022. Retrieved 3 July 2022.

[himmel-2] Himmel, Daniel; Riedel, Sebastian (2007-05-31). "After 20 Years, Theoretical Evidence That "AuF₇" Is Actually AuF₅·F₂". Inorganic Chemistry. 46 (13): 5338–5342. doi:10.1021/ic700431s. PMID 17511450.

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