引用本文:
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.
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.
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.
TIME RESOLVED SPECTRA OF Eu(MBA)3 PHEN COMPLEXES
摘要:
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 Eu3-,the spectra providc evidence that the Eu3- 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 Eu3+ sites in the former.
English
TIME RESOLVED SPECTRA OF Eu(MBA)3 PHEN COMPLEXES
Abstract:
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 Eu3-,the spectra providc evidence that the Eu3- 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 Eu3+ sites in the former.
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