Weak M(II)-azide-4,4 '-bipy ferromagnets based on unusual diamondoid (M = Mn) and 2D arrays (M = Co, Ni)

Four compounds of general formula [M(4,4'bipy)(N-3)(2)](n) (M Mn (I), Zn (2 ), Co (3), Ni (4)) have been synthesized and magnetostructurally characteri zed by means of X-ray diffraction analysis, IR and ESR spectroscopies, and measurements of the magnetic susceptibility and magnetization. Compound 1 ( C10H8N8Mn) crystallizes in the tetragonal P4(3)2(1)2 space Z = 4, with a = 8.229(2), b = 8.229(2), and c = 16.915(2) Angstrom. It exhibits an acentric 3D structure Where - Mn(II) ions are linked through EE-azide groups result ing in a diamondoid network. The 4,4'bipy ligands are coordinated on the ax ial positions of the octahedral spheres reinforcing, the intermetallic conn ections. Weak ferromagnetism arising from spin canting is observed for comp ound 1. Compounds 2, 3, and 4 are proposed to be isomorphous and would cons ist of a 2D array Where alternating EO + EE/EO + EE/EO + EO azide-chains ar e linked by 4,4'bipy ligands resulting in pi-pi stacked pyridyl-columns. Th e azido ligand dispositions in compounds 3 and 4 make possible systems of t ype -AF-AF-F-, which would give rise to a topological ferromagnetic behavio r.