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Effect of electric permittivity of the solvent on aggregation process of the water-soluble sulfonated metal phthalocyanines

Paper ID Volume ID Publish Year Pages File Format Full-Text
27254 44012 2011 8 PDF Available
Title
Effect of electric permittivity of the solvent on aggregation process of the water-soluble sulfonated metal phthalocyanines
Abstract

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.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Soluble phthalocyanines of divalent metals dimerize in binary aqueous solutions. ► The dimerization constant depends on the electric permittivity of the solvent. ► A semi-quantitative model is put forward describing the dimerization.

Keywords
Electronic spectra; Absorption; Fluorescence; Dimerization; Solvent effect; Dielectric constant
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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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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 223, Issues 2–3, 25 September 2011, Pages 149–156
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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Price after discount Only $4.95
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