Relaxation effects in the Mossbauer spectra of iron complexes with fatty acids

Six new mu 3-oxo trinuclear iron(III) complexes of the type [Fe3O(R-COO)(6) (H2O)(3)] . X, where X = NO3- or Cl- and R = C-5, C-7, C-8, C-9 were synthe sized and investigated by Infra Red, Mossbauer Spectroscopy and magnetic me asurements. The data pointed to a high spin state (S = 5/2) for iron and fo r antiferromagnetic interactions. The asymmetrical shape of the Mossbauer d oublet and its temperature dependence was treated using the Plume relaxatio n model. The relaxation process is influenced by both X and R components.