Mononuclear lanthanide complexes of tripodal ligands: synthesis and spectroscopic studies

Abstract

Lanthanide complexes of the tripodal ligand derived from the reaction of salicylaldehyde with tris (2-aminoethyl)amine have been obtained for the first time. The experimental procedure necessitates deprotonation of the ligand with a strong base prior to the addition of the lanthanide ion. These quite stable neutral complexes have been characterized by mass spectrometry (FAB +), 1D and 2D-NMR ( 1 H – 1 H COSY and 1 H – 13 C heteronuclear multiple quantum correlations). The corresponding complexes of the substituted tripodal ligand prepared from 3-methoxysalicylaldehyde have also been isolated and characterized.