摘要
合成了稀土铕、镧与吡啶－２，６二甲酸形成的二元配合物及铕与邻菲罗啉和吡啶－２，６二甲酸形成的三元配合物。经元素分析确定该配合物的组成分别为二元：Ｎａ３［Ｅｕ（ＤＰＣ）３］·２Ｈ２Ｏ，Ｎａ３［Ｌａ（ＤＰＣ）３］·２Ｈ２Ｏ；三元：ＮａＥｕ（ＤＰＣ）２·ｐｈｅｎ·４Ｈ２Ｏ。用核磁共振研究了配体与稀土的配位方式，讨论了诱导效应、屏蔽效应及稀土离子的顺磁性对配合物化学位移和ＮＭＲ谱图的影响。ＮＭＲ研究表明，三种配合物具有相似的对称结构和相同的化学位移变化规律。吡啶－２，６二甲酸中的羧酸以单齿配位（整个分子为三齿配位），二元配合物中，铕和镧的配位数均为９，三元配合物中，铕的配位数最低为８。
The binary and ternary solid complexes of rare earth Eu3+ and La3+ with pyridine-2 , 6-dicarboxylic acid(H2DPC) and 1, 10-phen-anthroline are synthesized. Their compositions confirmed by elemental analysis are binary Na3[Eu (DPC)3]·2H2O , Na3 [La (DPC)3]·2H2O and ternary NaEu (DPC)2·phen·4H2O.The ligand fashion of ligands and metal ions is studied by NMR. The influences on chemical shift and NMR spectra by induced effect , screening effect and paramagnetic character of rare earth ions are also discussed in this paper.The NMR studies show that three complexes have similar symmetric and regular changes of chemical shifts. pyridine-2, 6-dicarboxylic acid is a tridentate ligand. The coordinaiton number of europium and lanthanum is nine each in binary complexes. The coordination number of europium is eight at least in ternary complex.
出处
《中国稀土学报》
CAS
CSCD
北大核心
1996年第2期120-123,共4页
Journal of the Chinese Society of Rare Earths
关键词
铕
镧
吡啶
二甲酸
NMR
配合物
Eu, La, Pyridine-2, 6-dicarboxylic acid, ￣1H NMR , ￣(13)C NMR , ￣(14)N NMR
