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

摘要

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 CH_3OH/CHCl_3 solutions were studied. Under the excitation of ultraviolet light, a very strong red fluorescence of the solid [Eu(NO_3)_2L](NO_3) complex and a green fluorescence of the solid [Tb(NO_3)_2L](NO_3) complex were observed. The solvent factors influencing the fluorescent intensity were also discussed.