Synthesis and characterization of nanocomplexes of Eu(III) and Er(III) coordinate with 2(4-clorophenil)-3-phenyl-1,3,4-thiadiazoleo-5-tiolate mesoionic

• Autor(a) principal: Nascimento, Railda Shelsea Taveira Rochado
• Data de Publicação: 2010
• Outros Autores: Morais, Crislene Rodriguesda Silva, Lira, Héliode Lucena, Morais, Soraya Alves, Athayde Filho, Petrônio Filgueiras de, Lucena, Luciana de Figueiredo Lopes, Souza, Antonio Gouveia, Campos, Gabriela Brasileiro
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/30768
• topic: Thermal analysis; Thermal analysis; Pharmacs; Pharmacs; Mesoionic compounds; Mesoionic compounds; Lanthanides; Lanthanides

The solids achieved in nanometric scale have been demanding scientific and technological interest due to the significant alterations in physical and chemical properties observed in such kind of materials, potentializing their technological applications. The nanocomplexes produced by lanthanide ions with the mesoionic compounds 2(4-clorophenil)-3-phenyl-1,3,4-thiadiazole-5-tiolate (M-1) were achieved in a powdered yellowed way. These compounds were characterized through X-ray diffraction, infrared (IR) spectroscopy and differential scanning calorimetry (DSC). The X-ray diffractograms of the M-1 compound and of Er(M-1)3·3H2O, Eu(M-1)3·3H2O complexes, presented more than one phase and a crystalline structure. The disappearance and appearance of new peaks, as well as the variation on the intensity of the M-1 majoritary peaks as compared to the complexes’ peaks can also be observed. The IR spectra indicate that the coordination of M-1 with the cations Eu+3 e Er+3 probably happens due to the sulfur exocyclic atom, where a considerable displacement in the carbon–sulfur (C–S)-ligation can be perceived. Comparing the DSC curves of the M-1, Er(M-1)3·3H2O and Eu(M-1)3·3H2O, a displacement of the complexes peaks in relation to M-1 can be observed, suggesting the achievement of new specimens. Thus, it can be concluded that the formation of two new organic nanocomplexes with crystalline characteristics which may be used as a pharmacy, is quite evident