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The Studies of Enhanced Fluorescence in the Two Novel Ternary Rare-Earth Complex Systems

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Abstract

Two novel ternary rare-earth complexes SmL5·L’·(ClO4)2·7H2O and EuL5·L’·(ClO4)2·6H2O (the first ligand L = C6H5COCH2SOCH2COC6H5, the second ligand L’ = C6H4OHCOO−) were synthesized and characterized by element analysis, molar conductivity, coordination titration analysis, IR, TG-DSC, 1HNMR and UV spectra. The detailed luminescence studies on the rare-earth complexes showed that the ternary rare-earth complexes presented stronger fluorescence intensities, longer lifetimes, and higher fluorescence quantum efficiencies than the binary rare-earth materials. After the introduction of the second ligand salicylic acid group, the relative emission intensities and fluorescence lifetimes of the ternary complexes LnL5·L’·(ClO4)2·nH2O (Ln = Sm, Eu; n = 7, 6) enhanced more obviously than the binary complexes LnL5·(ClO4)3·2H2O. This indicated that the presence of both organic ligand bis(benzoylmethyl) sulfoxide and the second ligand salicylic acid could sensitize fluorescence intensities of rare-earth ions, and the introduction of salicylic acid group was a benefit for the fluorescence properties of the ternary rare-earth complexes. The fluorescence spectra, fluorescence lifetime and phosphorescence spectra were also discussed.

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Acknowledgements

This work was supported by the financial supports from the National Natural Science Foundations of China Research project (20861005).

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Authors and Affiliations

  1. College of chemistry and chemical engineering, Inner Mongolia University, Hohhot, 010021, People’s Republic of China

    **ao-Jun Sun, Wen-**an Li, Wen-Juan Chai, Tie Ren & **ao-Yan Shi

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  1. **ao-Jun Sun
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  2. Wen-**an Li
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  3. Wen-Juan Chai
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Correspondence to Wen-**an Li.

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Sun, XJ., Li, WX., Chai, WJ. et al. The Studies of Enhanced Fluorescence in the Two Novel Ternary Rare-Earth Complex Systems. J Fluoresc 20, 453–461 (2010). https://doi.org/10.1007/s10895-009-0567-7

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