Synthesis and Characterization of New Organometallic Lanthanides Metal Complex with Promising Photo Physical Activities

Abstract

New Schiff base ligand 4-methoxy salicaldhyde (3-hydrazonobutan-2-one) has been prepared. Molecular structures is characterized by elemental analysis, melting point.¹H-NMR spectra (3.5 ppm-10.39ppm) confirmed protons and ¹³C-NMR confirmed carbons. New optically active metal complexes of Sm(III), Gd(III) and Tb(III) Schiff were synthesized in one pot reaction. Vibrational IR bands confirmed multifunctional groups. Scanning electron microscopy (SEM) micrographs confirmed microstructure of metal complexes. Good optically activity of solid complexes are confirmed from electronic absorption spectra. X-ray diffraction patterns confirmed good crystalline structure of the metal complexes. Large absorption wavelength λ_max.280–390 nm and intense phosphorescence bands up to 730 nm of metal complex enabled application in photo dynamic therapy for cancer cells by enhancing cell apoptosis. Metal complexes act by conversion oxygen in tissue into reactive singlet oxygen that destroy cancer cell. Low charge transfer energy: 2.59 eV-2.61 eV and high molar extinction coefficients ε 6×10⁴ M-1cm-1 reflected good optical activity.