Magnetic properties of trinuclear Ni–M–Ni complexes, M = Mn, Co and Ni

A tetradentate ligand, abbr. L2− = dmSALPD2− = N,N′-bis(salicylidene)-1,3-propanediaminato dianion, has been complexed with metal ions in the presence of dimethylformamide (dmf) and nitrite anion. As a result, trinuclear molecular complexes of the type [MII{Ni(NO2)(L2−)(dmf)}2], where MII = Mn(II), Co(II) and Ni(II) were obtained. The magnetic susceptibility and magnetization data were treated simultaneously during the fitting procedure. In addition to the isotropic exchange, the zero-field splitting parameters DA were added to the spin Hamiltonian. An anti-ferromagnetic interaction was found in all complexes and the single ion magnetic anisotropy parameter for the Ni(II) peripheral centers adopt considerable values.