Interaction of the Sn(IV)-tetra(4-sulfonatophenyl)porphyrin axial complexes with cetyltrimethylammonium bromide: Aggregation and location in micelles, fluorescence properties and photochemical stability

Abstract Processes of anionic Sn(IV)-tetra(4-sulfonatophenyl)porphyrin axial complexes with three different ligands (hydroxyl, methoxidol and tyrosine) inclusion in an oppositely charged surfactant in a phosphate buffer at 25 °C were studied. It was shown how the association and localization of the porphyrins into spherical cetyltrimethylammonium bromide micelles affect the aggregation, micelle formation, fluorescent properties and photochemical stability of the systems formed depending on the nature of the Sn(IV)-porphyrin axial ligands. The results obtained determine conditions for quenching or enhancement the fluorescence of the hydrophilic Sn(IV)-porphyrin complexes while reducing the possibility of their photochemical destruction and can be useful in the design of new types of photosensitizers for PDT.