SYNTHESIS AND CARACTERIZATION OF NEW LUMINESCENT TB (III) COMPLEX BY THE APPLICATION OF UGI MULTICOMPONENT REACTION (MCR) ON A TRÖGER?S BASE SCAFFOLD

LEANRO TRUPP; TETTAMANZI C.; ANDREA BRUTTOMESSO; B. C. BARJA

Conferencia; XII Latin American Meeting on Photochemistry and Photobiology; 2015

SYNTHESIS AND CARACTERIZATION OF NEW LUMINESCENT TB (III) COMPLEX BY THE APPLICATION OF UGI MULTICOMPONENT REACTION (MCR) ON A TRÖGER?S BASE SCAFFOLD.Research in the area of luminescent lanthanide complexes is in constant growth, thanks to its applications in various fields such as sensors, light emitting devices, etc.[1] Due to the extremely low light absorption of lanthanides it is essential to find ligands that allow both metal complexation and its sensitization, and which in turn can be suitably functionalized to be used in the desired applications. It is known that MCRs are an effective synthetic strategy in the construction of compound libraries, and in this sense the Ugi MCR can be used for simultaneous introduction of several coordinating groups and/or chromophores into a selected scaffold, and would thus be an extraordinary methodology for the synthesis of this kind of complexes. One structure around which we can build a unique architecture in this area is the Tröger?s base, whose "V" shape allows placing different functional groups, with remote connectivity, close in space [2].Polycarboxylic acid **1** was synthesized in eight steps from simple precursors, with an Ugi MCR as the key step. **1** was characterized by 1D and 2D NMR, MS, IR and UV-vis spectroscopy and emission/excitation spectra. The formation of the Tb (III) complex of **1** and its sensitization was evident through the excitation and emission spectra, in which the characteristic narrow bands of terbium emission were observed. The formation of a 1:1 stoichiometry complex was confirmed using the most intense emission at 545 nm through Job?s plots and by titration of **1** with Tb (III). In the same way the formation of a 1:1 complex between Eu (III) and **1** was also established.In summary, in this first stage of labor we synthesized and characterized a new ligand capable of forming complexes with Tb and Eu using an Ugi MCR.