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新型桥联多核配合物的合成、光谱和磁性研究,对了解金属离子间的磁交换机理及开辟合成分子磁性材料的新途径有重要意义。研究稀土双核配合物的磁性,建立磁性与结构间的关系可为新型分子磁性材料的设计提供理论依据。氯醌酸是一种有效的多原子桥基,使用该桥基合成的一系列过渡金属配合物已有报道。在此基础上研究了两种新的稀土双核配合物:Gd_2(bpy)_2(CA)_3·8H_2O和Er_2(bpy)_2(CA)_3·4H_2O(bpy和CA分别代表α,α′-联吡啶和氯醌酸的二价阴离子)。磁分析表明,配合物中稀土离子间有很弱的反铁磁自旋相互作用。
The synthesis, spectroscopy and magnetic studies of the novel bridged polynuclear complexes are of great importance in understanding the mechanism of magnetic exchange between metal ions and opening up new avenues for synthesis of molecular magnetic materials. Studying the magnetism of rare earth binuclear complex, establishing the relationship between magnetism and structure can provide the theoretical basis for the design of novel molecular magnetic materials. Chloroquinic acid is a kind of effective polyatomic bridging group. A series of transition metal complexes synthesized by using this bridging group have been reported. Based on this, two new rare earth binuclear complexes were studied: Gd_2 (bpy) _2 (CA) _3 · 8H_2O and Er_2 (bpy) _2 (CA) _3 · 4H_2O (bpy and CA represent α, α’-linked Pyridine and chloroquinic acid). Magnetic analysis shows that there is a weak antiferromagnetic spin interaction between rare earth ions in the complex.