文摘
The synthesis, structure, and physical properties of a novel series of oxalate-based bimetallic magnets obtained byusing the Ir(ppy)2(bpy)]+ cation as a template of the bimetallic [MIIMIII(ox)3]- network are reported. The compoundscan be formulated as [Ir(ppy)2(bpy)][MIICrIII(ox)3]·0.5H2O (MII = Ni, Mn, Co, Fe, and Zn) and [Ir(ppy)2(bpy)]-[MIIFeIII(ox)3]·0.5H2O (MII = Fe, Mn) and crystallize in the chiral cubic space group P4132 or P4332. They show thewell-known 3D chiral structure formed by MII and MIII ions connected through oxalate anions with [Ir(ppy)2(bpy)]+cations and water molecules in the holes left by the oxalate network. The MIICrIII compounds behave as softferromagnets with ordering temperatures up to 13 K, while the MnIIFeIII and FeIIFeIII compounds behave as a weakferromagnet and a ferrimagnet, respectively, with ordering temperatures of 31 and 28 K. These values representthe highest ordering temperatures so far reported in the family of 3D chiral magnets based on bimetallic oxalatecomplexes.