Topic summary
High-valent iron
High-valent iron commonly denotes compounds and intermediates in which iron is found in a formal oxidation state greater than +3 that show a number of bonds above 6 with a coordination number no more than 6. The ferrate(VI) ion [FeO4] was the first structure in this class synthesized. The synthetic compounds discussed below contain highly oxidized iron in general, as the concepts are closely related.