Synthesis, structures and magnetic properties of pentanuclear and trinuclear heterometallic complexes with bended and linear cyano-bridges (tren = tris(2-aminoethyl)amine)

One mononuclear and three cyanide bridged multinuclear heterometallic complexes of Cu4Ni, Cu2Co and Cu2Ni were synthesized, and their magnetic properties are investigated, which show antiferromagnetic interactions.