-fluoride-3D-vdW.png) | |
| Names | |
|---|---|
| IUPAC name Dimercury difluoride | |
| Other names Mercury(I) fluoride Mercurous fluoride | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.034.302 |
| EC Number |
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| UNII | |
| |
| |
| Properties | |
| Hg2F2 | |
| Molar mass | 439.177 g/mol |
| Appearance | yellow cubic crystals |
| Density | 8.73 g/cm3, solid |
| decomposes[1] | |
Solubility product (Ksp) | 3.1×10−6[2] |
| −26.5·10−6 cm3/mol | |
| Hazards[3] | |
| GHS labelling: | |
   | |
| Danger | |
| H300,H310,H330,H373,H410 | |
| NFPA 704 (fire diamond) | |
| Flash point | non-flammable |
| Related compounds | |
Otheranions | Mercury(I) chloride Mercury(I) bromide Mercury(I) iodide |
Othercations | Zinc fluoride Cadmium fluoride |
Related compounds | Mercury(II) fluoride |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Mercury(I) fluoride ormercurous fluoride is thechemical compound composed ofmercury andfluorine with theformula Hg2F2. It consists of small yellow cubic crystals, which turn black when exposed to light.[1]
Mercury(I) fluoride is prepared by the reaction ofmercury(I) carbonate withhydrofluoric acid:
When added to water, mercury(I) fluoride hydrolyzes to elemental liquid mercury,mercury(II) oxide, and hydrofluoric acid:[1]
It can be used in theSwarts reaction to convertalkyl halides into alkyl fluorides:[4]
In common with other Hg(I) (mercurous) compounds which contain linear X-Hg-Hg-X units, Hg2F2 contains linear FHg2F units with an Hg-Hg bond length of 251 pm (Hg-Hg in the metal is 300 pm) and an Hg-F bond length of 214 pm.[5] The overall coordination of each Hg atom is a distortedoctahedron; in addition to the bonded F and other Hg of the molecule, there are four other F atoms at 272 pm.[5] The compound is often formulated asHg2+
2[F−]2.[6]
