Synthesis, mechanism and NMR spectra of lanthanide complexes with an unsymmetrical Schiff base

Owing to two unsymmetrical -NH2 groups sited on different terminals, L-lysi ne was used as a reactant for synthesizing a novel unsymmetrical Schiff bas e with salicylaldehyde on one side and 2,4-dihydroxy benzaldehyde on the ot her one. Eight new lanthanide complexes with the Ligand above were synthesi zed and characterized by elemental analysis, TG-DTA, molar conductivity, IR and EPR spectra, especially by a 500 MHz NMR spectrometer for 2D C-13-H-1 COSY and their high resolution solid state C-13 NMR spectra. The synthesis method, formation mechanism, coordination sphere of the complexes have been suggested as well. The results obtained may provide a new promising method for synthesizing the similar unsymmetrical Schiff bases and their complexe s.