Syntheses, structure and magnetic properties of oxamido-bridged trinuclear Cu-M-Cu macrocyclic complexes (MÂ =Â Cu, Co and Mn)

We reported three new trinuclear macrocyclic complexes containing oxamido-bridge shown in scheme (M = Cu, Co, Mn). The magnetic properties have been investigated. The χMT versus T plots for the three complexes exhibit antiferromagnetic coupled, with the best fit J = −188.85, −25.64 and −14.26 cm−1, respectively.