Eu3+ and Tb3+ Coordination Compounds with π‐conjugated Ligands: Luminescence and Structural Properties

Abstract New lanthanide‐based luminescent coordination compounds containing quinoline derivatives and 2‐(4‐hydroxyazobenzene)benzoic acid (HABA) were synthesized. Fourier transform infrared spectroscopy (FTIR), UV‐Vis spectra, Elemental analyses, Energy dispersive X‐ray fluorescence (EDXRF), and mass spectrometry (MALDI) were applied for six complexes′ structural elucidation. In addition, photoluminescence spectroscopy was performed in the solid state. Eu 3+ and Tb 3+ compounds linked to the π‐conjugated system described energy transfer to the metal through the antenna effect. Emission spectra depicted bands at 616–617 nm, characteristics of red light for Europium complexes, assigned as hypersensitive 5 D 0 → 7 F 2 transition, and depicted bands at 540–542 nm (green light) for Terbium complexes, assigned as 5 D 4 → 7 F 5 transition.