A new tetranuclear defective dicubane azide-bridged cobalt(II) complex

The azido ligand shows different bridging coordination modes, which typically promote different magnetic coupling (Scheme 1). The most common bridging coordination modes which usually promote ferromagnetic interactions are the μ1,1– (end-on, EO) mode, and the tri- and tetra-dentate bridging modes μ1,1,1–, and μ1,1,1,1–. Actually, the azido ligand showing the bridging coordination modes μ1,1– (II), μ1,1,1– (V), and μ1,1,1,1– (VIII) is widely employed in the syntheses of high spin clusters with different spin carriers, e.g. Mn10 [1](a), [1](b), Mn19 [1c], Mn25 [1](d), [1](e).