Synthesis and Characterization of Six Novel Samarium (III) Complexes with L-aspartic Acid, L-glutamic Acid, Glycine and O-phenanthroline, Bipiridile as Ligands

Resumen : Se sintetizaron dos series diferentes de complejos de samario (III): Sm(o-Phen) (L n ) 3 y Sm (bipy) (L n ) 3 (n = 1-3; L 1 = acido l-aspartico, L 2 = acido l-glutamico, L 3 = glicina) mediante metodos clasicos. Se utilizo una relacion molar 3:1 de los ligandos L n , de o-fenantrolina o de bipiridilo en cada caso. Los espectros UV-Vis muestran bandas agudas cerca de los 190 nm que corresponden al enlace Sm-O de alta energia asi como transiciones f→f. Los espectros FT-IR confirman enlaces Sm-O en las senales situadas entre 490 - 450 cm -1 . Los analisis de TGA-DTA, EA y MS revelan una buena correlacion con la propuesta estructural. Los calculos computacionales utilizando metodos semiempiricos facilitan algunas propiedades que sirven de guia para el desarrollo de aplicaciones fotoluminiscentes y antibacteriales. Abstract : Two different series of samarium (III) complexes, Sm (o-Phen) (L n ) 3 and Sm (bipy) (L n ) 3 (n = 1-3; L 1 = L-aspartic acid, L 2 = L-glutamic acid, L 3 = glicine), were synthesized by classic methods. Ligands L n and o-phenanthroline or bipiridile were used on a molar ratio 3:1 for each compound. UV-Vis reveals sharp signals near 190 nm corresponding to a high energy bond Sm-O and f→f transitions. FT-IR spectra shows itself a band between 490 - 450 cm -1 indicative of Sm-O bond. Analytical analysis of TGA-DTA, EA and MS, resolve structural proposals. Computational calculation using semiempirical methods, show properties as a guide to approach better applications for these compounds like photoluminescence devices and antibacterial drugs.