Silver subfluoride

Crystal structure
__ F -      __ Ag 1/2 +
General
Surname	Silver subfluoride
other names	Disilver monofluoride Silver (0 / I) fluoride
Ratio formula	Ag 2 F
Brief description	bronze-colored to yellow-green crystals
External identifiers / databases
CAS number 1302-01-8 Wikidata Q417478
properties
Molar mass	234.735 g mol −1
Physical state	firmly
Melting point	Decomposition> 100 ° C
solubility	Decomposes on contact with water
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Silver subfluoride (Ag ₂ F) is a bronze-colored, electrically conductive solid, in which silver formally has the oxidation state +0.5.

Appearance and properties

Silver subfluoride can be produced by electrolysis of AgF on a silver cathode at low current densities or from finely divided silver with AgF in hydrogen fluoride (HF):

${\displaystyle {\ce {Ag + AgF -> Ag2F}}}$

Ag ₂ F forms bronze-colored trigonal crystals that conduct electricity well, but disintegrate into Ag and AgF above 100 ° C. The enthalpy of formation ∆H _f is −212 kJ. The structure can be viewed as an anti-CdI ₂ type ( polytype 2H), with Ag forming double layers in a hexagonal close packing of spheres (layer sequence ABAB). The F ^- ions are located in the octahedral gaps every second layer . The Ag-Ag distances at 2.996 Å are very close to the distances in metallic silver (2.89 Å), while the Ag-F distances of 2.814 Å correspond to an ionic bond.

See also

• Silver (I) fluoride
• Silver (II) fluoride

Individual evidence

1. ^ NN Greenwood, A. Earnshaw. Chemistry of the elements . 1. corr. Edition. VCH, Weinheim, 1990, p. 1516, ISBN 3-527-26169-9 .
2. ^ ^{A b} A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , pp. 1343-1344.
3. ↑ ^{a b} Lee Poyer et al .: Disilver fluoride (Silver "subfluoride") . In: Therald Moeller (Ed.): Inorganic Syntheses . tape 5 . McGraw-Hill, Inc., 1957, pp. 18-21 (English).
4. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
5. ↑ G. Brauer (Ed.), Handbook of Preparative Inorganic Chemistry 2nd ed., Vol. 1, Academic Press 1963, pp. 239-240.

Web links

• Data sheet showing the structure of the Ag ₂ F