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Synthesis and Properties of Salicyladehyde Salicyhydrazone Derivatives and Their Europium Complexes

Abstract

Four novel salicyladehyde salicyhydrazone derivatives and their corresponding europium (Eu3+) complexes were synthesized and characterized. The formulas of the complexes were [EuLa−d(NO3)2](NO3) · H2O. The investigatoin of fluoresence properties of the Eu3+ complexes showed that the salicyladehyde salicyhydrazone derivatives were efficient sensitizers for the fluoresence of Eu3+ ions. The fluorescence intensity of the complex substituted by methyl (−CH3) was the strongest among all the Eu3+ complexes. The exploration of the electrochemical properties of the Eu3+ complexes showed that the introduction of electron-donating groups methyl and methoxyl (−CH3 and −OCH3) could increase the oxidation potential and the highest occupied molecular orbital (HOMO) energy level of the Eu3+ complex; however, the results of introduction of electron-withdrawing group were just opposite.

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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), the Science and Technology Project of Hunan provincial Science and Technology Department (No.2012GK3156) and chemical excellent engineer training programof 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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Correspondence to Dongcai Guo.

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Meng, D., Liu, F., Lian, X. et al. Synthesis and Properties of Salicyladehyde Salicyhydrazone Derivatives and Their Europium Complexes. J Fluoresc 24, 1661–1669 (2014). https://doi.org/10.1007/s10895-014-1453-5

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  • DOI: https://doi.org/10.1007/s10895-014-1453-5

Keywords

  • Europium complexes
  • Salicyhydrazone derivatives
  • Synthesis
  • Fluorescence
  • Electrochemical properties