Spectroscopic analysis of the powdery complex chitosan-iodine
| Autor: | Anna B. Shipovskaya, Olga A. Belyakova, N. O. Gegel, Tatyana N. Lugovitskaya, Tatyana S. Babicheva |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Hydrogen bond Infrared spectroscopy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Polyiodide chemistry Absorption band Triiodide Absorption (chemistry) 0210 nano-technology Iodate Macromolecule |
| Zdroj: | Saratov Fall Meeting 2017: Optical Technologies in Biophysics and Medicine XIX. |
| DOI: | 10.1117/12.2315067 |
| Popis: | A chitosan-iodine complex was obtained by modification of polymer powder in the vapor of an iodine-containing sorbate and studied by electron and IR spectroscopy, optical rotation dispersion. It was found that the electronic spectra of an aqueous solution of the modified chitosan (the source one and that stored for a year) showed intense absorption bands of triiodide and iodate ions, and also polyiodide ions, bound to the macromolecule by exciton bonding with charge transfer. Analysis of the IR spectra shows destruction of the network of intramolecular and intermolecular hydrogen bonds in the iodinated chitosan powder in comparison with the source polymer and the formation of a new chemical substance. E.g., the absorption band of deformation vibrations of the hydroxyl group disappears in the modified sample, and that of the protonated amino group shifts toward shorter wavelengths. The intensity of the stretching vibration band of the glucopyranose ring atoms significantly reduces. Heating of the modified sample at a temperature below the thermal degradation point of the polymer leads to stabilization of the chitosan-iodine complex. Based on our studies, the hydroxyl and amino groups of the aminopolysaccharide have been recognized as the centers of retention of polyiodide chains in the chitosan matrix. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|