Molecular-Capsule Assemblies and Systematic Control of Molecular-based Magnets Composed of Trinuclear Macrocyclic Complexes

通过三价金属源与基于2-水杨醛氨基苯酚的改性五齿配体反应，合成了具有独特大环结构的三核金属配合物。这些配合物的整个分子结构被认为是具有三重旋转轴的三角-金字塔几何结构。在这些配合物的晶体堆积中，两个手性对松散地聚集在一起形成一个大空腔(8x4x4A)的包囊构象，得到了两个新的包囊构象的配合物，其中包括单核八面体金属配合物。这些络合物的磁性测量表明，占主导地位的是非常弱的反铁磁相互作用。为了改善磁性相互作用，人们制备了更多简单的叔齿配体。得到的具有三角-金字塔结构的三核锰配合物具有很强的铁磁相互作用。研究表明，所得到的三核配合物可作为新型磁性材料应用。

New trinuclear metal complexes with unique macrocyclic structures have been obtained by the reaction of trivalent metal sources and modified pentadentate ligands based on 2-(salicylideneamino)phenol. The entire molecular structure of these complexes is regarded as a trigonal-pyramidal geometry with 3-fold rotation axis. In the crystal packing of these complexes, two chiral pairs are loosely aggregated to form capsular conformation with a large cavity (8 x 4 x 4 A).Two new complexes with capsular conformation including mononuclear octahedral metal complexes have been obtained. Magnetic measurements of these complexes indicate that very weak antiferromagnetic interactions are dominant. To improve the magnetic interactions, more simple terdentate ligands have been prepared. The obtained trinuclear Mn complexes with trigonal-pyramidal structure show strong ferromagnetic interactions. It is suggested the obtained trinuclear complexes can be applied as new magnetic materials.