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Photochemical & Photobiological Sciences Vol - 8 Issue - 9

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Photophysical properties and photodynamic activity of octacationic oxotitanium(iv) phthalocyanines

Content Provider	Royal Society of Chemistry (RSC)
Author	Kuznetsova, Nina Strizhakov, Anton Makarov, Dmitry Roumbal, Yana Kaliya, Oleg Ulanova, Ludmila Krasnovsky, Alexander Yuzhakova, Olga
Copyright Year	2009
Abstract	The photophysical and photosensitizing properties of two octacationic oxotitanium phthalocyanines (TiOPcs), bearing pyridiniomethyl or cholinyl substituents, have been studied in aqueous and alcohol solutions. In water, both compounds were monomeric with the high quantum yields of fluorescence (ΦF = 0.17–0.19) and singlet oxygen formation (ΦΔ = 0.4–0.5). The ΦF and ΦΔ of both phthalocyanines decreased with the increase of solvent hydrophobicity from water to ethanol. This effect was much stronger in alcohol solutions of the pyridiniomethyl-substituted phthalocyanine and probably results from aggregation of TiOPc molecules caused by association of chloride anions with phthalocyanine cationic groups. Evidence is presented that under illumination aqueous TiOPc solutions also produce hydroxyl radicals, which probably appear owing to photocleavage of water molecules. The quantum yield of OH formation was (3–5) × 10−5 after argon purging and twice as much in the presence of air. It is shown that irradiation of TiOPc solutions causes photobleaching of TiOPcs. The photobleaching quantum yield in water was found to be about 1 × 10−4. The data suggest that photobleaching occurs owing to the reactivity of hydroxyl radicals, though singlet oxygen is generated by TiOPcs much more efficiently. The phototoxicity of the tested TiOPcs toward bacteria has been revealed. It is proposed that both OH and 1O2 might be responsible for the observed bactericidal effects.
Starting Page	1724
Ending Page	1733
Page Count	10
File Format	HTM / HTML PDF
ISSN	1474905X
Volume Number	8
Issue Number	12
Journal	Photochemical & Photobiological Sciences
DOI	10.1039/b9pp00054b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Ethanol Fluorescence Hydrophobe Bactericide Quantum Phthalocyanine Singlet oxygen Chloride Phototoxicity Bacteria Argon Solvent Hydroxyl radical Photobleaching
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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Photophysical properties and photodynamic activity of octacationic oxotitanium(iv) phthalocyanines