Study On The Cyanide-bridged Molecular Magnetic Complexes Based On Planar Macrocyclic Ligands

Molecular magnetism has been one of the most active fields of research. Cyanide-bridged complexes, with the advantages of controllable and various molecular topological structures, the predictable magnetic coupling between metal atoms and rich magnetic and electro-optical properties, have become one of the main investigative systems of molecular magnetism. In this paper, cyanide-bridged heterometallic complexes with different molecular structures and magnetic properties have been synthesized by the rational selection and design of planar macrocyclic ligands and spin carriers with magnetic ions.1. Four Fe?-Cu? trinuclear complexes have been obtained by the reactions of macrocyclic cyclam copper compound and the [Fe(L)(CN)2]-(L= H2bpb, H2bpClb, H2bpmb and H2bpdmb) building blocks. All the complexes have been characterized by element analysis, IR spectra and X-ray diffraction. Magnetic investigations reveal that the presence of overall antiferromagnetic interaction is in all four cyanide-bridged complexes, and the abnormal antiferromagnetic coupling for the four complexes can be attributed to the small Cu-N?C bond angles.2. Two Mn?-M? (M= Os and Pt) two-dimensional (2D) pillow grid complexes and two cyanide-and phenolate-bridged Mn?-M? (M= Ru and Os) 2D complexes have been synthesized by the reaction of the planar schiff base ligands of [Mn?(salen)]+ with two cyanidemetalates containing five and six cyanide groups, and the crystal structures of the four complexes have been characterized. Magnetic investigations reveal that the the four complexes are antiferromagnetic, which is different from those cyanide-bridged complexes assembled from other schiff base ligands of [Mn?(salen)]+with cyanide building blocks.3. Three Mn?-M? (M= Fe, Ru and Os) trinuclear complexes and three Mn?-M? (M = Fe, Ru and Os) one-dimensional (1D) complexes have been assembled by the reaction of the planar macrocyclic ligands of [Mn(L1)]2+ and [Mn(L2)]2+ with [M(CN)6]4-(M= Fe, Ru and Os) building blocks, respectively. All the complexes have been characterized by element analysis, IR spectra and X-ray diffraction. Magnetic investigations reveal that the complexes of Fe and Ru are ferromagnetic and complexes of Os are antiferromagnetic.The above results indicate that topological structures and magnetic properties of molecular complexes can be efficiently controlled by the rational selection and design of planar macrocyclic ligands and spin carriers. And results can afford lots of valuable experiment gist and research ideas for the further investigation of the synthesis of novel cyanide-bridged complexes and the rational design and synthesis of interesting molecular-based magnetic materials.