Ferromagnetism of localized and itinerant electrons in two-dimensional organometallic networks

Аннотация

The magnetic properties of two-dimensional (2D) molecular magnets with compositions (NPn₄)[Fe^IIFe^III(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.