Specific Features of the Structural Organization of Porphyrin-Containing Binary and Ternary Polymer Systems: X-Ray Diffraction and Atomic Force Microscopy Study

The structure of the samples of polymer porphyrin-containing photosensitizing systems with different contents of chlorin e6 trisodium salt (Ce6Na), sodium alginate, and polyvinylpyrrolidone was investigated by X-ray diffraction and atomic force microscopy (AFM). The samples were obtained in the form of films by evaporation of aqueous solutions containing these compounds in different proportions. X‑ray diffraction studies show that, in two-component films Ce6Na–sodium alginate, a separate phase of the first substance and the phase of the second substance with the same structure as in the one-component films of this polymer are formed. At the same time, in two-component films Ce6Na–polyvinylpyrrolidone and three-component films Ce6Na–sodium alginate–polyvinylpyrrolidone, as evidenced by X-ray diffraction, the main part of Ce6Na does not form a separate phase, but the structure of polyvinylpyrrolidone changes in comparison with the one-component films of this polymer. In addition, X-ray diffraction studies show that, in the films containing sodium alginate and polyvinylpyrrolidone, these polymers form two separate phases. This conclusion also follows from the AFM data, although no significant influence of Ce6Na on the surface structure of the films obtained using sodium alginate, polyvinylpyrrolidone, and their mixture is revealed by AFM.