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  • 1 Academy of Sciences of Moldova Institute of Chemistry Academiei str. 3 277028 Chishinau Moldova
  • 2 Ruhr-Universität Bochum Institut für Experimental Physik VI D4630 Bochum Germany
  • 3 Institute of Physics and Technology of Materials P.O. Box MG7 Bucharest Romania
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The new Fe(III) complexes with isosceles or equilateral configurations showed atypical magnetic behaviour with a magnetic susceptibility which does not obey the Curie-Weiss law. The experimental data were fitted by using the Heisenberg-Dirac-van Vleck model with a spin Hamiltonian containing different exchange parameters in the case of isosceles configuration. A more elaborate Hamiltonian, taking into account the perturbation arising from a biquadratic exchange interaction was used in the case of equilateral configurations.