In this work, synthesis, characterization and photophysical properties of trivalent rare earth complexes with a nonsteroidal anti-inflammatory drug [the indomethacinate (indo), presenting formulas RE(indo) 3 (H 2 O) x (x = 3, for Eu 3+ and Gd 3+ , and x = 4 for Tb 3+), RE(indo) 3 (bipy) and RE(indo) 3 (phen) (bipy: 2,2'-bipyridine, and phen: 1,10-phenanthroline)] were investigated. Based on photoluminescent results, the intramolecular energy transfer process from T 1 triplet states of indo, phen and bipy ligands to the 5 D 0 emitting level of the Eu 3+ ion in the coordination compounds is discussed. Accordingly, it is proposed two possible intramolecular energy transfer mechanisms between indomethacinate ligand and rare earth ions, which involve the participation of excited electronic states of the heterocyclic ligands as intermediate ones.

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