Km. Yao et al., Synthesis, mechanism and NMR spectra of lanthanide complexes with an unsymmetrical Schiff base, ACT CHIM S, 58(10), 2000, pp. 1275-1279
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.