 | |
| Names | |
|---|---|
| IUPAC name Silver(III) fluoride | |
| Other names Silver trifluoride Argentic fluoride | |
| Identifiers | |
3D model (JSmol) | |
| ChEBI | |
| ChemSpider | |
| 100808 | |
| |
| |
| Properties | |
| AgF3 | |
| Molar mass | 164.86 g/mol |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Silver(III) fluoride, AgF3, is an unstable, bright-red, diamagnetic compound containingsilver in the unusual +3oxidation state. Its crystal structure is very similar to that ofgold(III) fluoride: it is apolymer consisting of rectangular AgF4 units linked into chains by fluoro bridges.[1]
AgF3 can be prepared by treating a solution containing tetrafluoroargentate(III)ions in anhydrous hydrogen fluoride with boron trifluoride;[2] the potassium tetrafluoroargentate(III) was prepared by heating a stoichiometric mix of potassium and silver nitrate in a sealed container filled with pressurised fluorine gas at 400 °C for 24 hours, twice. When dissolved in anhydrous HF, it decomposes spontaneously to Ag3F8 overnight at room temperature. The high-valence silver compounds described in the thesis are notable for their variety of colours: KAgF4 is bright orange, AgF3 bright red, AgFAsF6 is deep blue, Ag3F8 deep red-brown, and Pd(AgF4)2 is lime-green.
Earlier preparations usedkrypton difluoride as fluorinating agent, and tended to produce the mixed-valence Ag3F8 which may be thought of as silver(II) tetrafluoroargentate(III); Ag2F5, which is (AgF)+AgF4−, is formed by reacting AgF3 with AgFAsF6.
