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

Chem. J. Chinese Universities ›› 1998, Vol. 19 ›› Issue (8): 1211.

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

WU Jing¹, YAO Ke-Min¹, CHEN De-Yu¹, SHEN Lian-Fang², YUAN Han-Zhen²

1. Department of Chemistry, Zhejiang University, Hangzhou, 310027;
2. Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Phys. and Math., the Chinese Acadamy of Sciences, Wuhan, 430071

Received:1997-08-06 Online:1998-08-24 Published:1998-08-24

Abstract

Abstract: Nine new Ln(Ⅲ) complexes with a Schiff base, 2,4-dihydroxybenzylidene diglycol diamine, [Ln₂(DHYDA)₃(NO₃)₃](NO₃)₃· nH₂O (Ln=La, Pr, Nd, n=5; Ln=Sm, Gd, Tb, Er, Yb, Y, n=6), have been synthesized. Intramolecular Hbond in free ligand, the coordination of 2-OH and the uncoordination of 4-OH group in the obtained complexes have been proved by UV, IRspectra especially by 500 MHz ¹H and ¹²CNMRs pectra. 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 Ln³⁺. The EPR spectra of the Gd(Ⅲ) complex exhibits the "U" spectrum feature. The crystal field strength, the local symmetry around Gd³⁺in the complex have been discussed. The possible coordination number 10 is suggested tentatively.

Key words: Lanthanide complexe, Schiff base, Magnetic resonance

CLC Number:

O611

TrendMD:

WU Jing, YAO Ke-Min, CHEN De-Yu, SHEN Lian-Fang, YUAN Han-Zhen. Studies of Synthesis and Magnetic Resonance of Lanthanide Complexes with Noncyclic Polyether 2,4-dihydroxybenzaldehyde Schiff Base[J]. Chem. J. Chinese Universities, 1998, 19(8): 1211.

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

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