Cyclic single-molecule magnet in heterospin system

The crystal structure of the dinuclear cobalt(II) complex composed of didiazo-pyridine ligand D2[py.sub.2](TBA) and Co[(hfpip).sub.2], bis(1,1,1,5,5,5-hexafluoro-4-(4-tert-butylphenylimino)-2-pentanonate)cobalt and its magnetic behavior after irradiation in a crystalline state is examined. The results have shown that the magnetic interactions between the anisotropic cobalt ion and the carbenes generated by photolysis produce the observed single-molecule magnets (SMMs) character.