1. Effect of support-pore size on activity of heterogeneous photosensitizer based on phthalocyanine covalently grafted to aminopropylated silica gel
- Author
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A. A. Krasnovskii, Olga A. Yuzhakova, A. S. Kozlov, Marina G. Strakhovskaya, Nina A. Kuznetsova, and Oleg L. Kaliya
- Subjects
Aqueous solution ,Materials science ,Silica gel ,Singlet oxygen ,General Engineering ,Condensed Matter Physics ,Photochemistry ,Fluorescence ,chemistry.chemical_compound ,chemistry ,Covalent bond ,Phthalocyanine ,Molecule ,General Materials Science ,Photosensitizer - Abstract
New heterogeneous photosensitizers in which the active phase, aluminum (polycholinyl)tetra-3-phenylthiophthalocyanine, was covalently grafted to aminopropylated silica gels with pore sizes of 10, 25 and 75 nm have been synthesized. It is found that phthalocyanine cannot penetrate into 10-nm pores. Access to the pores increases with the increase in the pore size, resulting in the active phase being located predominantly inside pores in samples having 75-nm pores. It is demonstrated that the active phase is capable of fluorescence, singlet-oxygen photogeneration, and photobactericidal activity in aqueous suspensions of the heterogeneous photosensitizers, with the efficiency of these processes being higher for the dye molecules located on the surface of the support rather than inside the pores.
- Published
- 2013
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