Synthesis Conditions Impact on the Composition, Structure, and Fluorescence Properties of the Europium Dibenzoylmethane Complexes

The complexes of europium with dibenzoylmethane (= HDBM) and mixed-ligand complexes containing 1,10-phenanthroline (= phen) or 4,7-diphenyl-1,10-phenanthroline (= dpp) are synthesized by different methods (already proposed in the literature) and their elemental composition, I.R., 1H and 13C NMR, and fluorescence excitation and emission spectra, as well as X-ray pattern and thermochemical behavior are studied. The influence of the pH of reaction medium, temperature of synthesis, and drying of the complexes on the complexes composition, structure, and optical properties is investigated.