Ferromagnetism of localized and itinerant electrons in two-dimensional organometallic networks
The magnetic properties of two-dimensional (2D) molecular magnets with compositions (NPn4)[FeIIFeIII(C2O4)3] and ((NPn4)2)[Fe2(C6Cl2O4)3] are studied via 57Fe Mössbauer spectroscopy. It is shown that substituting the bridging oxalate ligand (C2O4)2− for chloranilate (C6Cl2O4)2− having the same coordination ability produces fundamental changes in the ground state, turning it from a ferrimagnetic insulator to a ferromagnetic conductor.