Synthesis, crystal structures and magnetic studies on the nickel(II) and manganese(II) complexes containing the 2-pyridyl methyl ketazine

► First examples of double helicates of diazine complexes containing octahedral-coordinated metal have been obtained. ► The introduction of Cl- ligand into coordination spheres of metal centers significantly varies the helical nature of L1. ► These compounds will be useful building blocks for the construction of magnetic materials.