Crystalline films of L‐threonine complexed with copper (II) dispersed in a Galactomannan solution: a structural, vibrational, and thermal study

• Autor(a) principal: Oliveira Neto, João G.
• Data de Publicação: 2019
• Outros Autores: Cavalcante, Lincoln A., Gomes, Eduardo S., Dos Santos, Adenilson O., Sousa, Francisco F, Mendes, Fernando 1973-, Macêdo, Ana Angélica M
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.26/32016
• topic: Crystalline films; Threonine; Copper; Galactomannan solution

The study’s aim was to synthesize a crystalline film formed by L-threonine crystals complexed with Cu2+ ions (LTCu) dispersed in a galactomannan (Gal) solution as well as to characterize its structural, vibrational, and thermal properties. Gal(LTCu) films were prepared by the addition of copper II L-threoninate crystals in concentrations of 0.25, 0.50, and 0.75 in 2%Gal solution. To characterize the Gal(LTCu) properties, we used X-ray diffraction (XRD), UV–Vis and Raman spectroscopy, thermogravimetry, and thermal analyses (TG- DTA). XRD showed that the Gal(LTCu) films are crystalline and have acquired coloration similar to the one of LTCu crystal. The UV–Vis spectra revealed that the films tend to assume a square planar conformation due to Jahn Teller effect. Bands related to the interaction between the metal ion with the organic compounds were observed through the Raman spectra. TG-DTA showed that the films exhibit low thermal stability due to the dehydration process