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'''Ferrocenium tetrafluoroborate''' is an ] with the formula BF<sub>4</sub>. This salt is composed of the cation <sup>+</sup> and the ] ] ({{chem|BF|4|−}}). The related ] is also a popular reagent with similar properties. The cation is often abbreviated Fc<sup>+</sup> or ]<sub>2</sub>Fe<sup>+</sup>. The salt is deep blue in color and ].
'''Ferrocenium tetrafluoroborate''' is an ] with the formula BF<sub>4</sub>. This salt is composed of the cation <sup>+</sup> and the ] ] ({{chem|BF|4|−}}). The related ] is also a popular reagent with similar properties. The ferrocenium cation is often abbreviated Fc<sup>+</sup> or ]<sub>2</sub>Fe<sup>+</sup>. The salt is deep blue in color and ].
Ferrocenium salts are sometimes used as one-electron oxidizing agents, and the reduced product, ], is inert and readily separated from ionic products. The ferrocene–ferrocenium couple is often used as a reference in electrochemistry. The standard potential of ferrocene-ferrocenium is dependent on specific electrochemical conditions.<ref name="Geiger" />
Ferrocenium salts are sometimes used as one-electron oxidizing agents, and the reduced product, ], is inert and readily separated from ionic products. The ferrocene–ferrocenium couple is often used as a reference in electrochemistry. The standard potential of ferrocene-ferrocenium is dependent on specific electrochemical conditions.<ref name="Geiger" />
Ferrocenium tetrafluoroborate is an organometallic compound with the formula BF4. This salt is composed of the cation and the tetrafluoroborateanion (BF 4). The related hexafluorophosphate 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.
Ferrocenium salts are sometimes used as one-electron oxidizing agents, and the reduced product, ferrocene, is inert and readily separated from ionic products. The ferrocene–ferrocenium couple is often used as a reference in electrochemistry. The standard potential of ferrocene-ferrocenium is dependent on specific electrochemical conditions.
Preparation
Commercially available, this compound may be prepared by oxidizing ferrocene typically with ferric salts followed by addition of fluoroboric acid. A variety of other oxidants work well also, such as nitrosyl tetrafluoroborate. Many analogous ferrocenium salts are known.
Structure
According to X-ray crystallography, the structures of the metallocene component of FcBF4 and the parent ferrocene are very similar. The Fe-C distances in the cation are 209.5 pm, about 2% longer than the Fe-C distances in ferrocene.
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Le Bras, J.; Jiao, H.; Meyer, W. E.; Hampel, F.; Gladysz, J. A. (2000). "Synthesis, Crystal Structure, and Reactions of the 17-Valence-Electron Rhenium Methyl Complex B(3,5-C 6H 3(CF 3) 2) 4: Experimental and Computational Bonding Comparisons with 18-Electron Methyl and Methylidene Complexes". J. Organomet. Chem.616: 54–66. doi:10.1016/S0022-328X(00)00531-3.
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