Synthesis and characterization of rare earth metal complexes with novel Schiff base

Objectives. The work set out to synthesize Schiff base ligands containing a hydrazone moiety of ( Z )-2-(( E )-1-hydroxyethylidene)hydrazineylidene)-2-phenylacetic acid, as well as their praseodymium, samarium, europium, and gadolinium complexes, and to study their structure. Methods. The structure of ligands was identified by infrared (IR), ultraviolet (UV), and nuclear magnetic resonance (NMR) spectroscopy. The structure of the complexes was confirmed by elemental analysis, IR and UV spectroscopy, and thermogravimetric analysis. Results. The Schiff base ligands containing a hydrazone moiety of ( Z )-2-(( E )-1-hydroxyethylidene)hydrazineylidene)-2-phenylacetic acid, as well as their praseodymium, samarium, europium, and gadolinium complexes, were synthesized using the authors’ procedure. Conclusions. NMR and IR spectroscopic data confirm that the Schiff base ligand is in the keto form. There are three absorption bands in the wavelength range of 205–306 nm in the UV spectrum of the ligand. A bathochromic shift is observed in the spectrum of all complexes. The molar ratio of ligand and metal in the complexes was 3 : 1.