Silver subfluoride
{{chembox
| Watchedfields = changed
| verifiedrevid = 445936996
| Name = Silver subfluoride
| ImageFile = Silver-subfluoride-3D-vdW.png
| ImageSize =
| ImageName = Silver subfluoride
| IUPACName = silver(0,I) fluoride
| OtherNames =
|Section1={{Chembox Identifiers
| CASNo_Ref = {{cascite|correct|??}}
| CASNo = 1302-01-8
| PubChem = 154085723
| StdInChI=1S/2Ag.FH/h;;1H/q;+1;/p-1
| StdInChIKey = NYHLXUAEPHSVOU-UHFFFAOYSA-M
| SMILES = F[Ag].[Ag]
}}
|Section2={{Chembox Properties
| Formula = Ag2F
| MolarMass = 234.734 g/mol
| Appearance = Bronze-colored crystals with green luster
| Density = 8.6 g/cm3, solid
| MeltingPtC = 90
| MeltingPt_notes = decomposition
| BoilingPt =
| Solubility = reacts
}}
|Section8={{Chembox Related
| OtherAnions =
| OtherCations =
| OtherCompounds = Silver(I) fluoride
Silver(II) fluoride
Silver(III) fluoride
}}
}}
Silver subfluoride is the inorganic compound with the formula Ag2F. This is an unusual example of a compound where the oxidation state of silver is fractional. The compound is produced by the reaction of silver and silver(I) fluoride:Lee Poyer, Maurice Fielder, Hugh Harrison, Burl E. Bryant "Disilver Fluoride: (Silver “Subfluoride”)" Inorganic Syntheses, 1957, Volume 5, 92–94. {{doi|10.1002/9780470132364.ch6}}
:Ag + AgF → Ag2F
It forms small crystals with a bronze reflex and is a good conductor of electricity. On contact with water almost instant hydrolysis occurs with the precipitation of silver (Ag) powder.
Crystal structure
Ag2F adopts the anti-CdI2 crystal structure, i.e. the same structure as cadmium iodide, CdI2, but with "Ag½+" centres in the I− positions and F− in the Cd2+ positions.{{cite journal | author=A Williams | title=Neutron powder diffraction study of silver subfluoride | journal=J. Phys.: Condens. Matter | volume=1 | issue=15 | pages=2569–2574 |date=April 1989 | doi=10.1088/0953-8984/1/15/002 | bibcode=1989JPCM....1.2569W | s2cid=250785624 | url=https://zenodo.org/record/1235726 }} The shortest distance between silver atoms is 299.6 pm (compared to 289 pm in the metal).Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier {{ISBN|0-12-352651-5}}
References
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{{Silver compounds}}
{{fluorine compounds}}
{{DEFAULTSORT:Silver Subfluoride}}