Thermochemical research of chitosan complexes with sulfonated metallophthalocyanines

The complexation processes of chitosan with cobalt(II)tetrasulfophthalocyanine (CoPc) and copper(II)tetrasulfophthalocyanine (CuPc) were studied calorimetrically in solution. It was established that CoPc forms two types of complexes with chitosan, while CuPc forms a single type of complex with chito...

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Bibliographic Details
Published in:International journal of biological macromolecules 2019-09, Vol.137, p.1153-1160
Main Authors: Lebedeva, Natalya Sh, Guseinov, Sabir S., Yurina, Elena S., Gubarev, Yury A., Koifman, Oskar I.
Format: Article
Language:English
Subjects:
Calorimetry
Chitosan
Chitosan - chemistry
Drug Stability
DSC
Indoles - chemistry
Molecular complexes
Phthalocyanine
Sulfonic Acids - chemistry
Temperature
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Summary:The complexation processes of chitosan with cobalt(II)tetrasulfophthalocyanine (CoPc) and copper(II)tetrasulfophthalocyanine (CuPc) were studied calorimetrically in solution. It was established that CoPc forms two types of complexes with chitosan, while CuPc forms a single type of complex with chitosan, in which copper(II)tetrasulfophthalocyanine is in dimerized form. The complexes are thermodynamically stable, which was allowed to study them in a solid form by different methods. Joint application of DSC and TG/DTG methods allowed us to identify the temperature intervals for evaporation of physically and chemically bounded water and thermal decomposition of chitosan and its complexes. The glass transition temperature of chitosan (110.8 °C) is greater than the glass transition temperature of the complexes with CuPc (74.7 °C) and CoPc (71.2 °C). Using SEM images and X-ray data of heated, unheated chitosan and its complexes, it was shown that the complexes are predominantly amorphous. Heating of chitosan and its leads to increasing of amorphous phase. Modification of chitosan by phthalocyanines leads to decreasing of thermal stability of complexes insignificantly. [Display omitted] •The polymer complex of metallophthalocyanines with chitosan was syntheses and characterized.•Thermodynamic parameters of complexation were estimated.•The glass transition temperature of chitosan and chitosan in complexes with phthalocyanines was established.•The crystallinity degree of samples before and after heating was confirmed by X-ray diffraction analysis.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2019.07.051