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合成了稀土镧和铕与谷氨酸、邻菲罗啉形成的二元及三元配合物,经元素分析确定该配合物的组成为Ln(phen)(Glu)3·7H2O(Ln=La,Eu);Eu(Glu)3·12H2O.用核磁共振(NMR)和红外光谱(IR)研究了配体与稀土离子的配位方式,讨论了稀土离子的顺磁性及屏蔽效应对配合物的NMR谱图的影响.NMR和IR研究表明,镧和铕配合物具有相同的对称结构和不同的化学位移变化规律,谷氨酸和邻菲罗啉分别为单齿和双齿配位,三种配合物中,镧和铕的三元配合物的配位数均为5,铕的二元配位数为3(均未包括配位水分子数).
The binary and ternary complexes of rare earth lanthanum with europium and glutamic acid and o-phenanthroline were synthesized. The composition of the complex was determined as Ln (phen) (Glu) 3 · 7H2O (Ln = La, Eu); Eu (Glu) 3 · 12H2O. The coordination modes between ligands and rare earth ions were studied by NMR and IR. The influence of the paramagnetic and shielding effects of rare earth ions on the NMR spectra of the complexes was also discussed. NMR and IR studies show that lanthanum and europium complexes have the same symmetry structure and different chemical shifts, and glutamic acid and o-phenanthroline are monodentate and bidentate. Among the three complexes, lanthanum and The coordination number of europium ternary complex is 5 and that of europium is 3 (both of which do not include coordination water).