Coordination Chemistry of the Imino Nitroxides. Ferromagnetic Behavior of Some First Row Transition Metal Complexes

The structural and magnetic properties of discrete adducts of imino nitroxides with first row transition metal ions are described. The striking result of this study is the large metal-radical ferromagnetic interactions in the Cu(II), Ni(II), Co(II) complexes induced by the bonding geometry of the imino nitrogen atom of the free radical to the metal. On the other hand, the Mn(II) adduct exhibit an antiferromagnetic behavior. These results are rationalized as arising from the exchange interaction between unpaired electrons in orthogonal magnetic orbitals.