Ferrocenium hexafluorophosphate
| Names | |
|---|---|
| Other names
dicyclopentadienyl iron hexacluorophosphate
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| Identifiers | |
| Properties | |
| C10H10F6FeP | |
| Molar mass | 331.00 g·mol−1 |
| Appearance | dark blue powder |
| Melting point | (decomposes) |
| Solubility in acetonitrile | Soluble |
| Hazards | |
| Safety data sheet | External MSDS |
|
EU classification (DSD)
|
 C |
| Related compounds | |
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Related compounds
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Ferrocene |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Ferrocenium hexafluorophosphate is an organometallic compound with the formula [Fe(C5H5)2]PF4. 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.
Commercially available, this compound may be prepared by oxidizing ferrocene typically with ferric salts followed by addition of hexafluorophosphoric acid.
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.
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