Synthese und spektroskopische Eigenschaften von Europium(III) und Terbium(III) Komplexen mit einem Pyrano[2,3-b]pyridin als Ligand
摘要:
Novel Eu3+ and Tb3+ complexes with a pyrano[2,3-b]pyridine ligand have been synthesized and characterized. The stability constants in 1:1 DMF-water were determined. In solution, various tautomeric forms of the free ligand are present, and their equilibrium is influenced by complexation to Ln3+ cations. Both the Eu3+ and Tb3+ complexes present an intense cation luminescence following the ligand excitation in the UV region. The cation emission quantum yields and life-times are discussed with regard to the mechanism of the ligand-to-metal energy transfer process.