镧系与直链醚-2,4-二羟基苯甲醛席夫碱新配合物的合成及波谱研究

Studies of Synthesis and Magnetic Resonance of Lanthanide Complexes with Noncyclic Polyether 2,4 dihydroxybenzaldehyde Schiff Base

Ｖｏｇｔｌｅ等［１］发现，直链醚除具有类似冠醚配位各种金属离子的能力外，还弥补了冠醚的不足之处，如易合成、产率高、价廉等．我们曾报道过有关ＥＰＲ工作［２，３］．本文合成了２，４－二羟基苯甲醛缩二甘醇二胺（ＤＨＹＤＡ）与镧系的新配合物，研究了配合物的１...

Nine new Ln(Ⅲ) complexes with a Schiff base, 2,4 dihydroxybenzylidene diglycol diamine, [Ln 2(DHYDA) 3(NO 3) 3](NO 3) 3· n H 2O (Ln=La, Pr, Nd, n =5; Ln=Sm, Gd, Tb, Er, Yb, Y, n =6), have been synthesized. Intramolecular H bond in free ligand, the coordination of 2 OH and the uncoordination of 4 OH group in the obtained complexes have been proved by UV, IR spectra especially by 500 MHz 1H and 13 C NMR spectra. The existence of two different structure ligands in the complexes has been suggested as well. One of the ligands acts as a bridge to connect two Ln 3+ . The EPR spectra of the Gd(Ⅲ) complex exhibits the “U” spectrum feature. The crystal field strength, the local symmetry around Gd 3+ in the complex have been discussed. The possible coordination number 10 is suggested tentatively.