Spiral dinuclear complexes of tetradentate N4 diazine ligands with Mn(II), Fe(II), Fe(III), Co(III), and Ni(II) salts

Five complexes belonging to the class of tetradente N4 diazine ligand were characterized. Analyses showed that the complexes had the same spiral structure, with three canted ligands wrapped around the dinuclear metallic core and three diazine N2 groups acting as bridges among the manganese, iron, cobalt and nickel centers. The magnetic properties of the Mn(II) derivative implied the presence of weak ferromagnetic coupling. The Fe(II) and Co(III) complexes were low-spin, while the Mn(II) and Ni(II) complexes were high-spin.