Synthesis and characterization of rare earth complexes with Phthalaldehyde-lysine Schiff base

Abstract

Ten new rare earth complexes with Schiff base (HL) derived from phthalaldehyde with two CHO groups and lysine, which has unsymmetrical α-and ε- -NH₂ groups, were synthesized and characterized by elemental analysis, TG-DTA analysis, UV Vis, IR, and ¹H NMR spectra. They were confirmed to be as LnL₂(NO₃)•4H₂O (Ln=La, Pr, Nd, Sm, Y) and LnL₂(NO₃)•3H₂O (Ln=Gd, Tb, Dy, Er, Yb), respectively. Furthermore, their coordination mechanism, spectral properties and probable molecular structures were also discussed.

Keywords

phthalaldehyde, lysine, rare earth metal, Schiff bases, complexation