Synthesis and Spectral Properties of Luminescent Europium(III) and Terbium(III) Complexes with an Amide‐Based, Open‐Chain Crown Ether

Abstract

A new amide‐based, open‐chain crown ether ligand, 1,7‐bis(2‐N‐(2‐pyridyl)‐benzamide)‐1,4,7‐trioxaheptane, and its europium(III) and terbium(III) complexes were synthesized and characterized. The europium(III) and terbium(III) ions were found to coordinate to the oxygen atoms of the C=O and the nitrogen atoms of the pyridine rings. The fluorescence properties of these complexes in the solid state and DMF and CH3OH/CHCl3 solutions were studied. Under the excitation of ultraviolet light, a very strong red fluorescence of the solid [Eu(NO3)2L](NO3) complex and a green fluorescence of the solid [Tb(NO3)2L](NO3) complex were observed. The solvent factors influencing the fluorescent intensity were also discussed.