Novel trigonal prismatic iron complexes of expanded hexadentate Jäger type ligands: synthesis and X-ray analysis

Mononuclear high-spin iron(III) complexes Fe2a and Fe2b were synthesized via reaction of the free ligands with iron(II) acetate. The conversion into iron(III) is due to spontaneous oxidation even under anaerob conditions, and the ligand acts as a threefold charged anion. X-ray analysis of Fe2a shows a hexacoordinated iron with a rather rare trigonal prismatic geometry of the coordination polyeder.