Silver subfluoride

Silver subfluoride
Names
	IUPAC name silver(0,I) fluoride
Identifiers
CAS Number	1302-01-8 ;
3D model (JSmol)	Interactive image;
PubChem CID	154085723;
	InChI InChI=1S/2Ag.FH/h;;1H/q;+1;/p-1 Key: NYHLXUAEPHSVOU-UHFFFAOYSA-M;
	SMILES F.;
Properties
Chemical formula	Ag2F
Molar mass	234.734 g/mol
Appearance	Bronze-colored crystals with green luster
Density	8.6 g/cm3, solid
Melting point	90 °C (194 °F; 363 K) decomposition
Solubility in water	reacts
Related compounds
Related compounds	Silver(I) fluoride; Silver(II) fluoride; Silver(III) fluoride
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). verify (what is ?) Infobox references

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:^[1]

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 "Ag^½+" centres in the I⁻ positions and F⁻ in the Cd²⁺ positions.^[2] The shortest distance between silver atoms is 299.6 pm (compared to 289 pm in the metal).^[3]

References

^ 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
^ A Williams (April 1989). "Neutron powder diffraction study of silver subfluoride". J. Phys.: Condens. Matter. 1 (15): 2569–2574. Bibcode:1989JPCM....1.2569W. doi:10.1088/0953-8984/1/15/002. S2CID 250785624.
^ Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN 0-12-352651-5

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[1] 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

[williams-2] A Williams (April 1989). "Neutron powder diffraction study of silver subfluoride". J. Phys.: Condens. Matter. 1 (15): 2569–2574. Bibcode:1989JPCM....1.2569W. doi:10.1088/0953-8984/1/15/002. S2CID 250785624.

[Wiberg&Holleman-3] Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN 0-12-352651-5

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