Gold heptafluoride
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| Names | |||
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| IUPAC name
Difluorinegold(V) fluoride | |||
| Other names
Gold heptafluoride | |||
| Identifiers | |||
3D model (JSmol) |
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| Properties | |||
| AuF7 | |||
| Molar mass | 322.956 g/mol | ||
| Appearance | Pale-yellow solid | ||
| Melting point | 100 °C (212 °F; 373 K) (decomposes) | ||
| 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).
Infobox references | |||
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. 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.
Gold heptafluoride decomposes at 100 °C to gold(V) fluoride releasing fluorine gas:
- AuF5·F2 → AuF5 + F2
It also undergoes hydrolysis in water.