Silver subfluoride
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
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| IUPAC name
silver(0,I) fluoride | |
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| Properties | |
| Ag2F | |
| 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 |
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| 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). | |
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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]
References
- 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
- 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.
- Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN 0-12-352651-5
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