Synthesis, characterization and investigation photoluminescence properties of Cu(II), Eu(III) and Tb(III) complexes derived from β –diketone ligands

Avobenzone is a diketone benzene derivative. Generally the enol form is observed in solution for β- diketones. The enol tautomer of these forms absorbs strongly in the UVA region whilst the keto forms generally absorb in the UVB region. To block UV light of avobenzone is one of the fundamental compounds in sunscreen. In this study, new tetradentate Schiff base ligands (L1H2, L2H2 and L3H2) were synthesized with the reaction of p-phenylenediamine and some avobenzone derivative containing β-diketone structure. The square planar and octahedral structural binuclear complexes have been synthesized by using the acetate salt of Cu(II) and the obtained ligands. Also, lanthanide complexes including Eu(III) and Tb(III) salts, 1,10-phenanthroline and compounds of β-diketone derivatives were obtained. The structures of synthesized compounds were determined using spectroscopic techniques such as FT-IR, 1H and 13C NMR, UV-Vis, LC-MS/MS and by thermal method such as TGA/DTA. In addition to spectroscopy techniques elemental analysis, magnetic susceptibility and electrolytic conductivity were used. X-ray diffraction method have been used for exact structures of L2H2 ligand and some of lanthanide complexes. All of the compounds synthesized by the method of solid-state photoluminescence excitation and emission values were determined.