Synthesis and characterization of tritendate Schiff base rare earth nano metal complexes

Abstract

The tridentate Schiff base ligand (1-pyridin-3-ylimino-ethyl benzene-1,3-diol were synthesized using precursor source 3-aminopyridine with 2,4-dihydroxyacetophenone in methanol at 60 °C. The prepared Schiff base ligand doped with rare earth metal complex such as Ce(III), Pr(III) and Er (III) ion, respectively and it is denoted as [Ln(L)(NO3)2(H2O)]·NO3. The Schiff base ligand and nano metal complexes have been characterized by UV–Visible, FTIR, 1H NMR, fluorescence spectrum (FL). Also the thermal properties of synthesized rare earth metal complexes were analysed by using TGA & DTA thermal analysis. These characterisation results given exact structural elucidation and optical properties of synthesized rare earth metal ions doped Schiff base nano metal complex. In UV spectra of the cerium, praseodymium and erbium nitrate complexes, there is no noticeable absorption in the visible region (380–700 nm) due to the shielding effect of rare earth 4f orbital electrons. FTIR spectra prove that the various functional groups present in doped Schiff base metal complexes. The blue shift in the, fluorescence spectra of lanthanide (III) complex indicates that the doped lanthanum ions have an apparent influence on the energy absorption of the complex system through well co-ordination with ligand. The purity and molecular formulae of synthesized Schiff base ligands and Ce(III), Pr(III) and Er (III) metal complexes were identified by H1 NMR, C13 NMR spectroscopy. Thermal analysis (TGA & DTA) concludes that synthesized rare earth metal complexes with Schiff base ligand have adequate thermal stability.