Abstract
The temperature dependence (220-470 K) of the magnetic susceptibility is reported for the organometallic molecular ferromagnet-chelates of the dinucleating Fe( II) 3-semicarbazone-2,3 dioxoindole ligand. An average antiferromagnetic exchange is present in the dinuclear Fe( II) chelates and is characterised by the coupling constant J= -44.1x10(-4) eV and g=2.08, where the spin-coupling Hamiltonian is taken as H= -2JS(1)S(2) for Fe(II) centres; the susceptibility studies agree and fit with this result. This study verifies the existence of 3-semicarbazone- 2,3 dioxoindole-bridged di-iron( II) centres. The temperature dependence of magnetic moment is illustrated.