Abstract
The metal complexes of lanthanum(III) and cerium(III) with Schiff bases derived from the condensation of 2-hydroxy-1-naphthaldehyde with α-amino acids, viz. glycine, alanine, phenylalanine, valine, leucine and L-glutamine, have been prepared and studied. The structures of these complexes are assigned on the basis of elemental analyses, molar conductance, IR and
1
H NMR spectra and thermal analyses data. The results suggest that all of the Schiff bases behave as dianionic tridentate (ONO) ligands except the Schiff base derived from L-glutamine which behaves as dianionic tetradentate (OONO) ligand. The apparent formation constants of the various complexes were determined spectrophotometrically and are discussed.