Luminescence and energy transfer processes in europium and terbium complexes with 2-substituted cycloalkanones and 1,10-phenanthroline derivatives

摘要: Abstract A series of solid lanthanide complexes with 2-substituted cycloalkanones (CA) the composition Ln(CA)3·Phn and Ln(CA)3·Bpy (Ln = Eu, Tb, Gd) have been synthesized investigated using luminescence spectroscopy. CA = 2-acetylcyclohexanone (AcCHex), 2-isobutyrylcyclohexanone, 2-acetylcyclopentanone, 2-acetylbutyrolactone, 2-benzoylcyclohexanone, 2-acetyltetralone; Phn = 1,10-phenanthroline (Phen), 4,7-dimethyl-phenanthroline, 3,4,7,8-tetramethyl-phenanthroline, 5-phenyl-phenanthroline, 4,7-diphenyl-phenanthroline; Bpy = 2,2′-bipyridine. Tris tetrakis compounds Ln(CA)3·2H2O LnNa(CA)4 were also synthesized. The composition, structure photophysical properties cycloalkanonates having oligomethylene chain in ligand are close to peculiarities β-diketonates without tethered chain. But presence this can cause a decrease energy lowest triplet state ligand. Stark Eu3+ electronic states europium CA adducts heterocyclic diimines corresponds distorted tetragonal anti-prismatic coordination geometry center. lifetimes 5D4 (Tb3+) 5D0 (Eu3+) at 77 K 0.55–0.85 ms. efficiencies comparable them for known β-diketonates. back transfer from triplets ligands is main lifetime Tb3+ efficiency 295 K. In Ln(AcCHex)3·Phn absorbed by two transferred Phn then Ln3+ ion. other Ln(CA)3·Phen compounds, ion carried out through CA, which located below Phen triplet. preliminary data on photochemical stability obtained.