Citation: Lin Pei JIN, Ming Zhao WANG, Rui Fen WANG, Jian Xin CHEN, Guang Zhi XU. TIME RESOLVED SPECTRA OF Eu(MBA)₃ PHEN COMPLEXES[J]. Chinese Chemical Letters, ;1993, 4(2): 183-186. shu

TIME RESOLVED SPECTRA OF Eu(MBA)₃ PHEN COMPLEXES

1.
Department of Chemistry, Beijing Normal University, Beijing, 100875;
Institute of Chemistry, Academia Sinica, Beijing, 100080

Received Date: 10 August 1992

Time-resolved fluorescence spectra of europium methylbenzoates（MBA）with 1,10-phenanthroline（phen）have been measured at room temperature.For each of the europium chelates,where the ligand triple states lie above the ⁵D₁ level of Eu^3-,the spectra providc evidence that the Eu^3- ⁵D⁰ state is populated by nonradiative energy transfer from the higher-lying ⁵D₁state.The relaxation time for energy decay from ⁵D₁ state is measured in the microcrystals to bc of the order of a few microseconds.It is suggested that the ligand C=0 and C=C stretching vibrations and Eu-O vibrations,chclate ring and benzene ring vibrations make important contributions to the relaxation process.The ⁵D₁-⁵D₀ relaxation time of Eu(p-MBA)₃phen is shorter than those of Eu(m-MBA)₃phen and Eu(o-MBA)₃phen since nonradiative degradation to ⁵D₀ from ⁵D₁ appears to be more strongly influenced by the E_u³⁺ sites in the former.
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