Synthesis and Photoluminescent Properties of Lanthanides Acetoacetanilide Complexes
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This work reports on the photoluminescent properties of three new lanthanide complexes with acetoacetanilide (aaa), a β-diketonate ligand. The complexes have the general molecular formulae [RE(aaa)3(H2O)], they are soluble in organic solvents such as ethanol and chloroform and insoluble in water. The energy of the triplet state was determined at about 4,700 cm−1 higher than the 5D4 emitting level of the Tb(III) ion, leading to an absolute quantum yield of 22 % for the [Tb(aaa)3(H2O)] complex. The photoluminescent properties were studied and the luminescence parameters of the [Eu(aaa)3(H2O)] complex were experimentally determined. The photostabilities of the complexes under continuous UV irradiation were measured and the data indicate low stability of the [Tb(aaa)3(H2O)] complex when the system is excited at the band attributed to energy transfer from the ligand to terbium(III) ion. However, its photostability is significantly improved under inert atmosphere.
KeywordsLuminescence Beta-diketone complexes Terbium(III) Europium(III)
ERS is indebted to CAPES for a PhD fellowship. IOM and FAS are indebted to CNPq and FAPESP for financial support. The authors would like to thank Prof. C. H. Collins (IQ-UNICAMP, Campinas, Brazil) for English revision and the Multiuser Laboratory of Advanced Optical Spectroscopy (LMEOA/IQ-UNICAMP/FAPESP 2009/54066-7). This work is a contribution of the National Institute of Science and Technology in Complex Functional Materials (CNPq-MCT/Fapesp).
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