The ligand field spectra of trinuclear chromium(III) and iron(III) basic acetates

Abstract

The visible spectra of trinuclear chromium(III) acetates [Cr3O(CH₃CO₂)₆R₂]⁺ can be successfully analysed by means of the ligand field theory for tetragonal fields. The ligands R (R = H₂O, NH₃, py, DMSO) are relatively labile and may be replaced by several ligands of varying donor strength. The spectra of trinuclear iron(III) acetates [Fe₃O(CH₃CO₂)₆R₃]⁺ are poorly resolved but can be interpreted on the basis of a d⁵ configuration in octahedral fields.