Silver subfluoride
Silver subfluoride
IUPAC name
silver(0,I) fluoride
3D model (JSmol)
  • InChI=1S/2Ag.FH/h;;1H/q;+1;/p-1
  • F[Ag].[Ag]
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
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 [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

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 "Ag½+" 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]


  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
  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.
  3. ^ Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN 0-12-352651-5