First macrocyclic oxamide Cu(II)–Co(II) complex: synthesis, crystal structure and magnetic properties

A oxamido-bridged binuclear complex, [Cu(L)Co(bpy)2](ClO4)2·0.5C2H5OH·H2O has been synthesized, and structurally and magnetically characterized, where L = 1,4,8,11- tetraazacyclotradecanne-2,3-dione and bpy = 2,2′-bipyridine. In the complex, the copper atom from the macrocyclic oxamido-copper(II) precursor in a square-planar and cobalt atoms in a distorted octahedral environment is bridged by the oxamidate group, Cu⋯Co separation of 5.359 Å. The metal–metal separations are consistent with the sequence of decrease of the ion radius of the metal ion. The magnetic properties of the complex have been investigated. The χMT versus T plots is typical of antiferromagnetically coupled Cu(II)–Co(II).