Synthesis and Characterization of Six Novel Samarium (III) Complexes with L-aspartic Acid, L-glutamic Acid, Glycine and O-phenanthroline, Bipiridile as Ligands
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Resumen
Resumen: Se sintetizaron dos series diferentes de complejos de samario (III): Sm(o-Phen) (Ln)3 y Sm (bipy) (Ln)3 (n = 1-3; L1 = ácido l-aspártico, L2 = ácido l-glutámico, L3 = glicina) mediante métodos clásicos. Se utilizó una relación molar 3:1 de los ligandos Ln, 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 energía así como transiciones f→f. Los espectros FT-IR confirman enlaces Sm-O en las señales situadas entre 490 - 450 cm-1. Los análisis de TGA-DTA, EA y MS revelan una buena correlación con la propuesta estructural. Los cálculos computacionales utilizando métodos semiempíricos facilitan algunas propiedades que sirven de guía para el desarrollo de aplicaciones fotoluminiscentes y antibacteriales.
Abstract: Two different series of samarium (III) complexes, Sm (o-Phen) (Ln) 3 and Sm (bipy) (Ln) 3 (n = 1-3; L1 = L-aspartic acid, L2 = L-glutamic acid, L3 = glicine), were synthesized by classic methods. Ligands Ln 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.
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