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Effect of electric permittivity of the solvent on aggregation process of the water-soluble sulfonated metal phthalocyanines
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SYSNO ASEP 0368842 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of electric permittivity of the solvent on aggregation process of the water-soluble sulfonated metal phthalocyanines Author(s) Palewska, K. (PL)
Sworakowski, J. (PL)
Lipinski, J. (PL)
Nešpůrek, Stanislav (UMCH-V) RIDSource Title Journal of Photochemistry and Photobiology A-Chemistry. - : Elsevier - ISSN 1010-6030
Roč. 223, 2/3 (2011), s. 149-156Number of pages 8 s. Language eng - English Country CH - Switzerland Keywords electronic spectra ; absorption ; fluorescence Subject RIV CA - Inorganic Chemistry R&D Projects KAN400720701 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z40500505 - UMCH-V (2005-2011) UT WOS 000297084000011 DOI 10.1016/j.jphotochem.2011.08.012 Annotation Dimerization of sulfonated phthalocyanines of divalent metals (Zn, Cu, and Co) in binary water-alcohol solutions was studied by spectroscopic techniques. The dimerization manifests itself in changes in the absorption spectra and in a decrease of fluorescence intensity. The equilibrium constants of dimerization depend on the electric permittivity of the solvent and on degree of sulfonation. The process can be semi-qualitatively described by a simple model taking into account solvation and electrostatic interactions between phthalocyanine anions. The effect of electric permittivity has not been observed in sulfonated Al and Si phthalocyanines. Experimentally determined fluorescence quantum yields in alcoholic solutions range between 0.74 and 0.015. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2012
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