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Silver(II) fluoride

Silver(II) fluoride
Silver(II) fluoride
Names
IUPAC name
silver(II) fluoride
Other names
silver difluoride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.124
EC Number 232-037-5
PubChem CID
Properties
AgF2
Molar mass 145.865 g/mol
Appearance white or grey crystalline powder, hygroscopic
Density 4.58 g/cm3
Melting point 690 °C (1,274 °F; 963 K)
Boiling point 700 °C (1,292 °F; 973 K) (decomposes)
Decomposes violently
Structure
orthorhombic
tetragonally elongated
octahedral coordination
linear
Hazards
Main hazards toxic, reacts violently
with water, powerful oxidizer
Safety data sheet MSDS
Related compounds
Other anions
Silver(I,III) oxide
Other cations
Copper(II) fluoride
Palladium(II) fluoride
Zinc fluoride
Cadmium(II) fluoride
Mercury(II) fluoride
Related compounds
Silver subfluoride
Silver(I) fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YesYN ?)
Infobox references

Silver(II) fluoride is a chemical compound with the formula AgF2. It is a rare example of a silver(II) compound. Silver usually exists in its +1 oxidation state. It is used as a fluorinating agent.

AgF2 can be synthesized by fluorinating Ag2O with elemental fluorine. Also, at 200 °C (473 K) elemental fluorine will react with AgF or AgCl to produce AgF2.

As a strong fluorinating agent, AgF2 should be stored in Teflon or a passivated metal container. It is light sensitive.

AgF2 can be purchased from various suppliers, the demand being less than 100 kg/year. While laboratory experiments find use for AgF2, it is too expensive for large scale industry use. In 1993, AgF2 cost between 1000-1400 US dollars per kg.

AgF2 is a white crystalline powder, but it is usually black/brown due to impurities. The F/Ag ratio for most samples is < 2, typically approaching 1.75 due to contamination with Ag and oxides and carbon.

For some time, it was doubted silver was actually in the +2 oxidation state rather in some combination of states such as AgI[AgIIIF4], which would be similar to silver(I,III) oxide. Neutron diffraction studies, however, confirmed its description as silver(II). The AgI[AgIIIF4] was found to be present at high temperatures, but it was unstable with respect to AgF2.

In the gas phase, AgF2 is believed to have D∞hsymmetry.

Approximately 14 kcal/mol (59 kJ/mol) separate the ground and first states. The compound is paramagnetic, but it becomes ferromagnetic at temperatures below −110 °C (163 K).


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