Ferrocenium hexafluorophosphate
| Names | |
|---|---|
| Other names
dicyclopentadienyl iron hexacluorophosphate
| |
| Identifiers | |
| ECHA InfoCard | 100.157.410 |
| Properties | |
| C10H10F6FeP | |
| Molar mass | 330.999 g·mol−1 |
| Appearance | dark blue powder |
| Melting point | (decomposes) |
| Solubility in acetonitrile | Soluble[citation needed] |
| Hazards | |
| Safety data sheet (SDS) | External MSDS |
| Related compounds | |
Other anions
|
Ferrocenium tetrafluoroborate |
Related compounds
|
Ferrocene |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
Ferrocenium hexafluorophosphate is an organometallic compound with the formula [Fe(C5H5)2]PF6. This salt is composed of the cation [Fe(C5H5)2]+ and the hexafluorophosphate anion (PF−
6). The related tetrafluoroborate is also a popular reagent with similar properties. The cation is often abbreviated Fc+ or Cp2Fe+. The salt is deep blue in color and paramagnetic.
Ferrocenium salts are one-electron oxidizing agents, and the reduced product, ferrocene, is relatively inert and readily separated from ionic products. The ferrocene–ferrocenium couple is often used as a reference in electrochemistry. In acetonitrile solution that is 0.1 M in NBu4PF6, the Fc+/Fc couple is +0.641 V with respect to the normal hydrogen electrode.[1]
Preparation and structure
Commercially available, this compound may be prepared by oxidizing ferrocene with ferric salts followed by addition of hexafluorophosphoric acid.[1]
The compound has been characterized by X-ray crystallography. The cation and anion are well separated. The average Fc-C bond lengths is 2.047 Å, which is virtually indistinguishable from the Fe-C distance in ferrocene.[2]
References
- ^ a b Connelly, N. G.; Geiger, W. E. (1996). "Chemical Redox Agents for Organometallic Chemistry". Chem. Rev. 96 (2): 877–910. doi:10.1021/cr940053x. PMID 11848774.
- ^ "Structure of ferrocenium hexafluorophosphate". Acta Crystallogr. C46: 202–205. 1990. doi:10.1107/S0108270189005883.
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