Syntheses and Studies of Novel Unsymmetrical Naphthyridylamino Ligands and Their Metal String Complexes
Date Issued
2006
Date
2006
Author(s)
Chen, Chi-Fen
DOI
zh-TW
Abstract
This thesis is presented to study the crystal structures and physical properties of the linear polymetal complexes. The major geometries of these complexes are composed of the linear polymetal core surrounded by the ligands：Hphany、Hmophany、Htfmphany and H2napany.
Since these ligands are unsymmetrial, these complexes may have several different isomeric forms. These forms could be assigned as (4,0)、(3,1)、(2,2-trans) and (2,2-cis) according to the orientation of the phenyl groups. In the research of the linear polymetal complexes, the isomeric forms may result from the size of the different axial ligands. If the axial ligand is NCS-, several kinds of isomers including (2,2-trans)、(2,2-cis) and (3,1) forms could be obtained due to the weak steric effect. However, the (4,0) form will be the major product when the axial ligand is Cl- which causes strong steric hindrance. Furthermore, the linear hexanickel complex have been reduced during synthesis without adding reducing agents. This phenomenon is similar to the [Ni5(bpy)Cl2](PF6)2 (bpy = binaphthyridiylamine).
The SQUID experiments of these linear trinickel complexes which have two axial ligands show strong antiferromagnetic coupling which are similar to the Ni3(dpa)4Cl2. On the other hand, the linear polymetal complexes which are (3,1) and (4,0) forms only have one magnetic center which could be observed in the SQUID experiments.
Subjects
金屬串錯合物
Metal String Complexes
Type
thesis
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