ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Immobilization of porphyrins in poly(hydroxymethylsiloxane)
Stanislav Šabata, Jiří Hetflejš, Renata Rychtáriková, Gabriela Kuncová, Kamil Lang, and Pavel Kubát
Institute of Chemical Process Fundamentals of the ASCR v.v.i., 165 02, Praha 6-Suchdol, Rozvojová 135, Prague, Czech Republic
Received: 2 September 2008 Revised: 19 November 2008 Accepted: 26 November 2008
Abstract: Three tetracationic porphyrins differing in the position of charged nitrogen atoms on the peripheral substituents — 5,10,15,20-tetrakis(N-methylpyridinium-4-yl)porphyrin (TMPyP4), 5,10,15,20-tetrakis(N-methylpyridinium-2-yl)porphyrin (TMPyP2), 5,10,15,20-tetrakis(4-trimethylammoniophenyl) porphyrin (TMAPP), and hydrophobic 5,10,15,20-tetraphenylporphyrin (TPP), were immobilized by adsorption
and encapsulation in poly(hydroxymethylsiloxane) (PHOMS). The so prepared porphyrin-PHOMS composites were characterized by
porosimetry, scanning electron microscopy, fluorescence and diffuse reflectance UV-VIS spectroscopy. It was found that porphyrins
are immobilized in the PHOMS matrix in the free base monomer form Their irradiation produced singlet oxygen O2(1Δg) with the lifetime of 10–30 μs.
Keywords: poly(hydroxymethylsiloxane) - porphyrin - fluorescence spectra - singlet oxygen
Full paper is available at www.springerlink.com.
Chemical Papers 63 (4) 438–444 (2009)