ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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

E-mail: kuncova@icpf.cas.cz

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(¹Δ_g) with the lifetime of 10–30 μs.

Keywords: poly(hydroxymethylsiloxane) - porphyrin - fluorescence spectra - singlet oxygen

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-009-0037-3

Chemical Papers 63 (4) 438–444 (2009)