Synthesis, magnetic properties, and Mössbauer spectra of polynuclear iron carboxylates

Abstract

Several carboxylates of iron(II) and iron(III) have been prepared and their magnetic properties and Mössbauer spectra studied. [Fe₄(OMe)₆(O₂CMe)₆], [Fe₅O(O₂CMe)₁₂][O₂CMe], and [Fe₃(dmf)₃O(O₂CPh)₆][O₂CPh]·dmf (dmf = dimethylformamide) are antiferromagnetic but [Fe₄O(O₂CMe)₁₀] is ferromagnetic. [Fe(O₂CMe)₂] and [Fe(py)₂(O₂CMe)₂] are magnetically dilute. The iron(III) compounds show Mössbauer spectra typical of high-spin Fe³⁺ ions, but the spectrum of [Fe₄O(O₂CMe)₁₀] is very asymmetric. The characterizations have been supported by appropriate mass-spectrometric, ebulliometric, and conductimetric studies, and electronic and infrared spectra.