Synthesis and Characterization of New Lanthanide Complexes Using Pipemidic Acid (PPA) and Dioxane as Ligands
CUI Yu-min1, TAO Dong-liang1*, ZHANG Wen-bao1，YIN Rong-can1，XU Yi-zhuang2, 3, WU Jin-guang2, 3
1. College of Chemistry and Chemical industry, Fuyang Teacher’s College, Fuyang 236041, China 2. State Key Laboratory of Rare Earth Materials Chemistry and Applications, Beijing 100871, China 3. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
Abstract：Eu(PPA)3dioxane and Tb(PPA)3dioxane were synthesized by firstly adopting dioxane as second ligand and using pipemidic acid (PPA) as first ligand. In contrast with two kinds of binary lanthanide complexes Eu(PPA)3 and Tb(PPA)3, the photoluminescent intensities of Eu(PPA)3dioxane and Tb(PPA)3dioxane are much stronger, especially for that of Tb(PPA)3dioxane. The enhancement of photoluminescent intensities of Eu(PPA)3dioxane and Tb(PPA)3dioxane is because of the replacement of dioxane for water bonded to Eu3+ and Tb3+, by which the energy loss through heat oscillation will be inhibited. The as-synthesized lanthanide complexes were characterized by FT-IR, photoluminescence spectra and photoluminescence lifetime. The lifetime of Eu(PPA)3dioxane and Tb(PPA)3dioxane remarkably changed compared with those of Eu(PPA)3 and Tb(PPA)3. However, there is much difference for the lifetime change of as-synthesized lanthanide complexes formed by Eu3+ and Tb3+, which shows that there is different energy transfer process for the lanthanide complexes formed by Eu3+ and Tb3+. The synthesis of lanthanide complexes using dioxane as second ligand will provide a new method to detect the existence of dioxane.
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