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

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Resumo: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
Autores principais:Oliveira Neto, João G.
Outros Autores:Cavalcante, Lincoln A.; Gomes, Eduardo S.; Dos Santos, Adenilson O.; Sousa, Francisco F; Mendes, Fernando 1973-; Macêdo, Ana Angélica M
Assunto:Crystalline films Threonine Copper Galactomannan solution
Ano:2019
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso aberto
Instituição associada:Instituto Politécnico de Coimbra
Idioma:inglês
Origem:Instituto Politécnico de Coimbra

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