A hexanuclear iron(iii) complex of a hexadentate fully conjugated diimine ligand derived from 1,4-diformyl-2,3-dihydroxybenzene

Abstract

A fully conjugated acyclic diimine ligand, H₄L³, formed from 1,4-diformyl-2,3-dihydroxybenzene and 2-aminophenol, was reacted with iron(II) acetate to give the hexanuclear complex [Fe^III₆(L³)₄(μ-OMe)(μ-OH)(MeOH)₄] (2). Crystals of 2·ADPOX·7.5MeOH·H₂O, where ADPOX is 2-amino-10,10a-dihydro-3H-phenoxazin-3-one, were obtained by slow evaporation and the X-ray structure determination revealed that the six octahedral iron(III) ions are bridged by four fully-deprotonated (L³)⁴⁻ ligands that are arranged in a [2 × 2] grid-like arrangement relative to one another.