Abstract
The photoacoustic (PA) spectra of Eu(Phen)2(Sal)2Cl · H2O and coprecipitates Eu0.9Ln0.1(Phen)2(Sal)2Cl · H2O complexes (Ln3+ :Nd3+ or Tb3+; Phen: phenanthroline; Sal: salicylic acid) are reported. In the region of the ligand absorption, the PA intensity increases for Eu0.9Tb0.1(Phen)2(Sal)2Cl · H2O, Eu(Phen)2(Sal)2Cl · H2O and Eu0.9Nd0.1(Phen)2(Sal)2Cl · H2O, respectively. It is indicated that additions of the second lanthanide ions change the relaxation processes of the complexes. The changes of fluorescence spectra turn out to be complementary to the PA spectra. The intramolecular energy transfer and intermolecular energy-transfer processes in the coprecipitates are discussed in depth from two aspects: radiative and nonradiative processes.
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