Abstract
Seven novel coumarin derivatives derived from salicylaldehyde and phenol were synthesized and characterized by 1H NMR and 13C NMR spectra, mass spectra, infrared spectra and elemental analysis. Their corresponding Eu(III) complexes having general formula EuL1−7(NO3)3⋅2H2O were successfully prepared and characterized by elemental analysis, EDTA titrimetric, molar conductivity, UV–Vis, FT-IR and thermal performance studies. The luminescence properties, fluorescence quantum yields and the electrochemical properties of the title complexes were investigated. The results showed that the title complexes exhibited characteristic emissions of europium ions and possessed relatively good fluorescence quantum yields. The luminescence intensity of the complex with bromine-substituted group is the strongest among all the title complexes. The introduction of electron-withdrawing groups can increase the luminescence properties and fluorescence quantum yields, decrease the HOMO and LUMO energy levels of the title europium complexes, but electron-withdrawing group conversely. And these title complexes may possibly be useful for studying in luminescent materials field.
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Acknowledgments
The authors are grateful for the financial support of the National Natural Science Foundation of China (No.J1103312; No.J1210040; No.21341010), the Innovative Research Team in University (No.IRT1238) and chemical excellent engineer training program of Hunan university. We also thank Dr. William Hickey, the U.S. professor of HRM, for the English editing on this paper.
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Yan, D., Li, D., Cheng, G. et al. Synthesis, Characterization and Properties of Novel Coumarin Derivatives and Their Europium Complexes. J Fluoresc 25, 849–859 (2015). https://doi.org/10.1007/s10895-015-1563-8
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DOI: https://doi.org/10.1007/s10895-015-1563-8