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Hexafluorophosphate
Hexafluorophosphate is an anion with chemical formula of . It is an octahedral species that imparts no color to its salts. is isoelectronic with sulfur hexafluoride, , and the hexafluorosilicate dianion, , and hexafluoroantimonate . In this anion, phosphorus has a valence of 5. Being poorly nucleophilic, hexafluorophosphate is classified as a non-coordinating anion. Synthesis Hexafluorophosphate salts can be prepared by the reaction of phosphorus pentachloride and alkali or ammonium halide in a solution of hydrofluoric acid: : Hexafluorophosphoric acid can be prepared by direct reaction of hydrogen fluoride with phosphorus pentafluoride. It is a strong Brønsted acid that is typically generated ''in situ'' immediately before its use. : These reactions require specialized equipment to safely handle the hazards associated with hydrofluoric acid and hydrogen fluoride. Quantitative analysis Several methods of quantitative analysis for the hexafluorophosphate ion have b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ferrocenium Hexafluorophosphate
Ferrocenium hexafluorophosphate is an organometallic compound with the formula e(C5H5)2F6. This salt is composed of the cation e(C5H5)2sup>+ and the hexafluorophosphate anion (). 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. Preparation and structure Commercially available, this compound may be prepared by oxidizing ferrocene with ferric salts followed by addition of hexafluorophosphoric acid. The compound is monoclinic with well-separated cation and anion; the may rotate f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
