Syntheses, structures and magnetic properties of tetranuclear and trinuclear nickel(II) complexes with β-diketone-functionalized pyridinecarboxylate ligand

The new β-diketone-functionalized pyridinecarboxylate ligand (H2L) and its polynuclear nickel complexes, [Ni4L4(DMF)(H2O)3]·2.5DMF·3H2O (1) and [Ni3L2(OAc)2(DMF)2 (H2O)2]·DMF·H2O (2) have been synthesized characterized. Complex 1 has a [2×2] molecular grid structure and 2 is a trinuclear structure. The magnetic properties study of 1 and 2 revealed the intramolecular antiferromagnetic exchange coupling between the Ni(II) ions exists.