Structure and Magnetic Properties of Two Discrete 3d-4f Heterometallic Complexes

摘要

Two discrete 3d-4f heterometallic complexes (CoDyIII)-Dy-III(CH3CN)(0.5)(L-1)(3)(NO3)(3) (1) and (Ni2DyIII)-Dy-II(EtOH)(L-2)(4)(NO3)(2)Cl . CH3CN (2) were obtained from the reactions of 8-hydroxyquinoline (HL1) or 2-methyl-8-hydroxyquinoline (HL2) with their corresponding metal salts. Complex1presents a dinuclear structure with the Dy(III) and Co(II) ions linked by three phenolic oxygen atoms from three (L-1)(-)ligands. Complex2presents a triangular trinuclear structure with the two Ni(II) ions and one Dy(III) ion consolidated by one chloride ligand and four phenolic oxygen atoms from four (L-2)(-)ligands. Their chi(M)TversusTplots show different profiles with obvious ferromagnetic interactions between the metal ions in2. Both complexes exhibit slow magnetic relaxation behaviours, but with obvious different features. It revealed a cooperatively regulating effect of ligand and transition metal ions on the structures and magnetic properties.