Luminescent properties of compounds of europium(III) with quinaldic acid and beta-diketones

摘要

We have obtained luminescent complex compounds of europium(III) with quinaldic acid and beta- diketones of composition Eu(Quin)(2)beta-dic aEuro cent De(2)D, where Quin is the anion of quinaldic acid, and beta-dic is the anion of acetylacetone (acac), benzoylacetone (bzac), or dibenzoylmethane (dbm). The spectral properties of the obtained compounds have been examined. The joint presence of quinaldic acid and beta-diketone in the coordination sphere of europium(III) leads to a broadening of the absorption spectral range of the investigated complex compounds. We have found that the "anomalous" Stark structure of luminescence spectra and the luminescence quenching of complexes at 300 K are determined by the occurrence of a high-lying ligand-europium(III) charge-transfer state.