Ki. Turta et al., THE MAGNETIC-PROPERTIES OF TRINUCLEAR FE(III) SUBSTITUTED CARBOXYLATECLUSTERS, Journal of radioanalytical and nuclear chemistry, 190(2), 1995, pp. 347-355
The new Fe(III) complexes with isosceles or equilateral configurations
showed atypical magnetic behaviour with a magnetic susceptibility whi
ch does not obey the Curie-Weiss law. The experimental data were fitte
d by using the Heisenberg-Dirac-van Vleck model with a spin Hamiltonia
n containing different exchange parameters in the case of isosceles co
nfiguration. A more elaborate Hamiltonian, taking into account the per
turbation arising from a biquadratic exchange interaction was used in
the case of equilateral configurations.