Composites with Photosensitive 5,10,15,20-tetrakis(N-methylpyridinium-4-yl)porphyrin Entrapped into Silica Gels

0375223 - ÚCHP 2012 RIV US eng J - Journal Article
Rychtáriková, Renata - Šabata, Stanislav - Hetflejš, Jiří - Kuncová, Gabriela
Composites with Photosensitive 5,10,15,20-tetrakis(N-methylpyridinium-4-yl)porphyrin Entrapped into Silica Gels.
Journal of Sol-Gel Science and Technology. Roč. 61, č. 1 (2012), s. 119-125. ISSN 0928-0707. E-ISSN 1573-4846
R&D Projects: GA MŠMT ME 892
Institutional research plan: CEZ:AV0Z40720504
Keywords : sol-gel * photosensitizer * immobilization
Subject RIV: CC - Organic Chemistry
Impact factor: 1.660, year: 2012

Photosensitive cationic 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin (TMPyP) was entrapped into microporous silica gels prepared by sol–gel method from tetrakis(2-hydroxyethoxy)silane (THES) and tetramethoxysilane (TMOS), resp., using different water and PEG 600 contents in the initial mixture. The absorption spectra of both composites showed that incorporation of TMPyP has led to a bathochomic shift (ca. 8 nm) of the Soret band and to a decrease in their molar absorption coefficient compared to TMPyP in solution. The TMPyP encapsulation kept the molecular state of the porphyrin in the free-base monomer form. In comparison to TMOS analogs, THES composites showed prolonged shape stability at least for 3 months, one-order higher rate of chemical substrate photooxidation and higher photobiocidal activity against E. coli.
Permanent Link: http://hdl.handle.net/11104/0207942