N1,N5-Bis(3-methoxysalicylidene)-di-imino-3-azapentane-based Mn3+, Co3+ and Cu2+ complexes: Synthesis, coordination behavior and magnetic properties

► Flexible ligand with long chain backbone is used to assemble metal complexes. ► The ligand can adjusts conformation to fit with the geometries of the metal ions. ► The ligand exhibits difference of twist and coordination pattern in title complexes. ► Antiferromagnetic interaction is propagated between the metal centers in 1 and 3.