Fabrication and luminescence properties of Eu (III) complexes based on 2-formyl-8-oxy-N-phenylacetamide quinoline derivatives

Novel 2-formyl-8-oxy-N-phenylacetamide quinoline derivatives shows good coordination with Eu (III) ion. The target complexes performed good thermal stability, and excellent fluorescence property. [Display omitted] •The six novel Eu (III) complexes based on 2-formyl-8-oxy-N-phenylacetamide quinoline derivatives were prepared, and their physical and chemistry properties were proved.•Based on the photoluminescence analysis and thermogravimetric analysis, the Eu(III) complexes perform red fluorescence with a good thermal stability.•The Eu(III) complexes with -Cl group performed the best fluorescence properties because of the heavy atom effect of halogen. A series of 2-formyl-8-oxy-N-phenylacetamide quinoline derivatives ligands L1-6 were synthesized and proved by 1H NMR and MS, their corresponding Eu(III) complexes were also synthesized. Their physical and chemistry properties were proved by elemental analysis, molar conductance, UV absorption spectra, FT-IR spectra and Thermogravimetric analysis. The EuL1-6(NO3)3·2H2O preform characteristic red luminescence of Eu3+. The EuL6(NO3)3·2H2O containing Cl present the strongest luminescence intensity, as well as the fluorescence quantum yield. Based on the good thermal stability and red luminescence properties of the target Eu(III) complex, it can be designed as fluorescence probe with chemistry modification and can expand quinoline derivatives development in the field of biomedicine.