Supramolecular complexation of the cationic derivative of Zn (II) phthalocyanine and sodium alginate in mixed aqueous solutions

Авторы публикации: 
Lipatova, I.M., Yusova, A.A., Lukyanets, E.A.
Journal of Photochemistry and Photobiology A: Chemistry
Год публикации: 
Volume 364, Pages 588-594



• Complexation of sodium alginate with cationic Zn(II)phthalocyanine was investigated.

• Complexation with alginate causes fluorescence quenching of phthalocyanine.

• Stages: self-assembly, intra-supramolecular rearrangement, metastable state, precipitation.

• Complexation causes a decrease in the polymer hydrodynamic radius.

• The complex can dissociate by the introduction of salt or cationic polysaccharide.



The processes of supramolecular complexation in mixed dilute aqueous solutions of sodium alginate and positively charged Zn (II) phthalocyanine derivative were investigated by spectrophotometry and dynamic light scattering methods. The complexation is accompanied by fluorescence quenching. The process of complexation includes the stages of electrostatic self-assembly, intra-supramolecular rearrangement, metastable state and phase separation. The hydrodynamic radius and zeta potential of the complex in the metastable state for different compositions of mixed solutions are determined. The pH range of the existence of the complex and the conditions for its dissociation upon introduction of a low molecular weight electrolyte and a cationic polysaccharide are determined.

Graphical abstract

The supramolecular complexation in dilute aqueous solutions of sodium alginate and positively charged phthalocyanine photosensitizer was investigated. Phthalocyanine is present in the complex in the form of non-fluorescing aggregates. The characteristics of the complex, as well as the conditions for its dissociation are determined.



Лосев Николай Владимирович