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Silver(II) fluoride is a chemical compound with the formula AgF2. It is a rare example of a silver(II) compound. Silver is usually present in its +1 oxidation state. It is used as a fluorinating agent.
Additional recommended knowledge
As a strong fluorinating agent, AgF2 should be stored in Teflon, a passivated metal container, or a quartz tube. 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.
Composition and structure
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 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∞h symmetry.
AgF2 is a strong fluorinating and oxidation agent. Illustrative applications are listed below.
This type of reaction can occur in three different ways (here Z refers to any element or group attached to carbon, X is a halogen):
Similar transformations can also be effected using other high valence metallic fluorides such as CoF3, MnF3, CeF4, and PbF4.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Silver(II)_fluoride". A list of authors is available in Wikipedia.|