SÍNTESE E CARACTERIZAÇÃO DE COMPLEXOS DE ÍONS ÉRBIO E ITÉRBIO

Abstract

Coordination chemistry is crucial for exploring the potential applications of a wide range of compounds in areas such as sustainability and health. Lanthanides, also known as rare earth elements, exhibit unique spectroscopic properties and are used in critical applications in modern technology, such as magnets, wind turbines, automobiles, and military systems. A characteristic feature of these metals' complexes is their excellent photoluminescent properties, enabling applications in bioimaging, chemical sensing, and biomedicine. However, these applications require the synthesis of lanthanide ion coordination compounds with organic ligands to enhance luminescence intensity through absorption, intramolecular energy transfer, and light emission from one chemical species to another. This research describes the synthesis and characterization of complexes with erbium and ytterbium ions (Er+3 and Yb+3) β-diketonates, using the ligand 2,2-bipyridine-3,3-dicarboxylic acid. Elemental CHN analysis indicates that the complexes exhibit a coordination environment with two β-diketonate ligands and one 2,2-bipyridine-3,3- dicarboxylic acid ligand within the coordination sphere. Infrared spectroscopy shows the absence of carbonyl bands (ν(C=O)) in the complex spectra. UV-Vis spectra display transitions associated with the ligands, including π→π* and n-σ* transitions, prominently observed in the complex spectra, indicating complex formation.