Destruction of Chitosan and Its Complexes with Cobalt(II) and Copper(II) Tetrasulphophthalocyanines

Chitosan is a naturally occurring polysaccharide derived from chitin with a wide range of uses. Phthalocyanines are macroheterocyclic compounds that have a number of useful properties such as coloring and catalytic and antioxidant activity. Phthalocyanines are able to immobilize on chitosan, forming...

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Bibliographic Details
Published in:Polymers 2021-08, Vol.13 (16), p.2781
Main Authors: Lebedeva, Natalia Sh, Yurina, Elena S., Guseinov, Sabir S., Gubarev, Yury A., V’yugin, Anatoly I.
Format: Article
Language:English
Subjects:
Antioxidants
Chemical composition
Chemical reactions
Chitin
Chitosan
Cobalt
Coordination compounds
Copper
Copper compounds
Crosslinking
Destruction
Inert atmospheres
Ligands
Metal phthalocyanines
Molecular weight
Oxidation
Photodynamic therapy
Polymers
Polysaccharides
Stability analysis
Thermal stability
Viscosity
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Summary:Chitosan is a naturally occurring polysaccharide derived from chitin with a wide range of uses. Phthalocyanines are macroheterocyclic compounds that have a number of useful properties such as coloring and catalytic and antioxidant activity. Phthalocyanines are able to immobilize on chitosan, forming complexes with new useful properties. In this work, we evaluated the ability of phthalocyanines to increase the thermal stability of chitosan. Chitosan (CS) forms complexes with copper(II)-(CuPc) and cobalt(II)-(CoPc) tetrasulphophthalocyanines. The processes of destruction of chitosan (CS) and its complexes with sulphophthalocyanines CuPc and CoPc in oxidizing and inert atmospheres have been studied. It was established that, regardless of the atmosphere composition, the first chemical reactions taking place in the studied systems are elimination reactions. The latter ones in the case of chitosan and complex CS-CuPc lead to the formation of spatially crosslinked polymer structures, and it causes the release of CuPc from the polymer complex. It was found that in the case of CS-CoPc elimination reactions did not lead to the formation of crosslinked polymer structures but caused the destruction of the pyranose rings with a partial release of CoPc. Metallophthalocyanines showed antioxidant properties in the composition of complexes with chitosan, increasing the temperature of the beginning of glycosidic bond cleavage reaction by 30–35 °C in comparison with the similar characteristics for chitosan.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym13162781