Ferro- and antiferromagnetic interactions in polymeric and molecular complexes of Cu(hfac)2 with 1-oxoazin-2-yl-substituted nitronyl nitroxides

► Heterospin complexes with nitronyl nitroxides bearing N-oxoazines. ► 7-Membered metallocycles. ► A rare structural topology of the heterospin polymer chain. ► Ferro- and antiferromagnetic interactions.