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Crystalline Films of L‐Threonine Complexed with Copper (II) Dispersed in a Galactomannan Solution: A Structural, Vibrational, and Thermal Study
Author(s) -
Oliveira Neto João G.,
Cavalcante Lincoln A.,
Gomes Eduardo S.,
Dos Santos Adenilson O.,
Sousa Francisco F,
Mendes Fernando,
Macêdo Ana Angélica M
Publication year - 2020
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.25260
Subject(s) - raman spectroscopy , thermogravimetry , materials science , copper , thermal stability , analytical chemistry (journal) , crystallography , thermal analysis , chemical engineering , inorganic chemistry , thermal , chemistry , organic chemistry , metallurgy , optics , physics , meteorology , engineering
The study's aim was to synthesize a crystalline film formed by L‐threonine crystals complexed with Cu 2+ 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. POLYM. ENG. SCI., 60:71–77, 2020. © 2019 Society of Plastics Engineers