Mechanosynthesis of high molecular weight fluorescent derivatives of chitosan, linear and non-linear optical characterization

Autor: F. M. Muñoz-Pérez, María Aurora Veloz-Rodríguez, J. G. Ortega-Mendoza, Oscar Javier Hernández-Ortíz, G. M. Estrada-Villegas, Rosa Angeles Vázquez-García, J. L. Imbert-Palafox, A. H. Rojas-Calva
Rok vydání: 2021
Předmět:
Zdroj: Journal of Polymer Research. 28
ISSN: 1572-8935
1022-9760
Popis: Three chitosan-derived compounds, Ch-I, Ch-Qn, and Ch-TPA, were synthesized through condensation reactions between high-molecular weight chitosan and three different aldehydes. Mechanosynthesis, a fast and solvent-free synthesis method, was used instead of a depolymerization. The chemical structure of the compounds was elucidated by Fourier-Transform Infrared (FT-IR) spectroscopy. The optical properties of the new compounds were evaluated by ultraviolet/visible (UV/Vis) and fluorescence spectroscopic techniques. The compounds Ch-I, Ch-Qn, and Ch-TPA presented absorptions in the range of 273 to 400 nm and emissions between 300 and 700 nm with Ch-TPA presenting the greatest redshift in absorption and emission. Ch-I, Ch-Qn, and Ch-TPA were characterized by the Z-scan technique, and the results indicate that Ch-I, Ch-Qn, and Ch-TPA exhibit non-linear optic behavior. Ch-TPA showed the most promising optical properties. These results indicate that it is possible to obtain promising materials derived from chitosan using mechanosynthesis and using high-molecular weight chitosan without the need to depolymerize it. Mechanosynthesis requires a short reaction time, is free of solvents, and has the potential for biomedical applications as optical and/or fluorescent biosensors.
Databáze: OpenAIRE
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