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.

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