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Recebido em 12/7/04; aceito em 2/3/05; publicado na web em 30/6/05 SPECTROSCOPIC STUDY OF THE Eu 3+ , Tb 3+ AND Gd 3+ COMPLEXES WITH LIGANDS DERIVED FROM DICARBOXYLIC ACIDS. Complexes of Eu 3+ , Tb 3+ and Gd 3+ with dipicolinic acid, chelidamic acid and chelidonic acid have been synthesized in order to study the effect of the substituent groups on the luminescence of the lanthanide complexes. The luminescence of the Eu 3+ and Tb 3+ complexes was quantified by quantum yield measurements. Thedoi:10.1590/s0100-40422005000500014 fatcat:ym7tans3xzahfdrdv5bi6upwhm