Synthesis, Characterization, and Antibacterial Activity of New Rare-Earth Ion Complexes with Unsymmetrical Schiff Base Ligand

摘要

A new unsymmetrical Schiff base ligand (H2LLi) was synthesized using L-lysine, salicylaldehyde, and 2-hydroxy-l-naphthaldehyde. Three rare-earth ion complexes of this ligand, [REE(H2L)(NO3)]NO3 · 2H2O (REE = La, Sm, Ho), have been prepared and characterized by elemental analyses, IR spectra, UV spectra, TG-DTG, and molar conductance. The antibacterial activity of the ligand and its complexes are also studied. The antibacterial experiments indicate that this ligand and its complexes possess antibacterial activity against Escherichia coli, Staphylococcus aureus and Bacillus subtilis and the complexes have higher activity than that of the ligand.