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.
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Dubicki et al. (1969) studied this question.
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