Metallocorroles with Formally Tetravalent Iron (pages 731–735)
Prof. Dr. Emanuel Vogel, Dipl.-Chem. Stefan Will, Dipl.-Chem. Andreas Schulze Tilling, Dr. Ludger Neumann, Dr. Johann Lex, Dr. Eckhard Bill, Prof. Dr. Alfred X. Trautwein and Prof. Dr. Karl Wieghardt
Article first published online: 22 DEC 2003 | DOI: 10.1002/anie.199407311
The unusual oxidation state + IV for iron centers can be stabilized by porphyrin-like corrole ligands in such a way that the compounds 1 (R Cl, Ph, OFe-corrole) can be isolated at room temperature. The oxygen-bridged binuclear iron(IV) corrole, which can be readily converted into the mononuclear iron(IV) corrole, forms as the only defined product from the reaction of the ligand with [Fe2(CO)9] followed by workup in air. In contrast, only a few iron(IV) porphyrins are known so far, and these are too unstable to be isolated as solids.