邻香草醛缩5-氨基水杨酸Schiff碱稀土配合物的合成与表征

Synthesis and Characterization of Rare Earth Complexes with Schiff Base of O-Vanillin-5-Aminosalicylic Acid

通过邻香草醛和5-氨基水杨酸的反应合成了一个新的四齿Sch iff碱配体HL,红外光谱和核磁共振氢谱证明配体中有四个配位原子,分别是酚羟基氧原子、亚甲胺基团上的氮原子以及两个羧基氧原子。通过REC l3与此配体的反应合成了六种新型Sch iff碱固体稀土配合物,并通过元素分析、IR、UV-V IS1、H-NM R、热分析和摩尔电导率等物理测试手段考察了配合物的组成。结果表明,配体通过其酚羟基氧原子、亚甲胺基团上的氮原子以及两个羧基氧原子与中心离子配位,C l-也参与了配位,中心离子的配位数是7。配合物的组成可能为:RE2L3C l3.nH2O(RE=L a,N d,G d,D y,Y b,Y)。

A quadridentate OOON donor Schiff-base ligand, HL, was synthesized by the reaction of O-vanillin and 5-aminosalicylic acid. The structure of the ligand was elucidated by IR and ^1H-NMR spectra which indicated the presence of four coordination atoms, the oxygen atoms of phenolic OH groups, the nitrogen atom from the azomethine, C=N, group and the oxygen atom of carboxylic group. Six new rare earth complexes have been synthesized through the reaction of lanthanide （ Ⅲ ） chlorides with this ligand. Their structures have been characterized by elemental analysis, IR, UV-VIS, ^1H-NMR spectra, TG-DTA and molar conductance. The ligand coordinates with rare earth ions through two phenolic oxygen atoms, one carboxylic oxygen atom and one nitrogen atom from azomethine C=N group, Cl^- also takes part in coordination, so the coordination number is seven. The composition of these complexes can be represented as RE2L3Cl3 · nH2O （RE = La, Nd, Gd, Dy, Yb, Y）.