Ferrocenium hexafluorophosphate
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 ferrocenium cation is often abbreviated Fc+ or Cp2Fe+. The salt is deep blue in color and paramagnetic.
Names | |
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IUPAC name
Ferrocenium hexafluorophosphate | |
Identifiers | |
3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.157.410 |
PubChem CID |
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Properties | |
C10H10F6FeP | |
Molar mass | 330.999 g·mol−1 |
Appearance | dark blue powder |
Density | 1.808 g/cm3 |
Melting point | (decomposes) |
Solubility in acetonitrile | Soluble |
Structure | |
monoclinic | |
P21/c | |
Lattice volume (V) |
1215.8(5) Å3 |
Hazards | |
GHS labelling: | |
Warning | |
H315, H319, H335 | |
P261, P305+P351+P338 | |
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).
Infobox references |
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.[3]
Preparation and structure
Commercially available, this compound may be prepared by oxidizing ferrocene with ferric salts followed by addition of hexafluorophosphoric acid.[3]
The compound is monoclinic with well-separated cation and anion; the PF−
6 may rotate freely. The average Fe-C bond length is 2.047 Å, which is virtually indistinguishable from the Fe-C distance in ferrocene.[2]
References
- "Ferrocenium hexafluorophosphate 388297". Sigma-Aldrich.
- R. Martinez; A. Tiripicchio (1990). "Structure of ferrocenium hexafluorophosphate". Acta Crystallogr. C46 (2): 202–205. doi:10.1107/S0108270189005883.
- 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.