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Influence of Surfactant-based Microheterogeneous Fluids on Aggregation of Copper Phthalocyanine Tetrasulfonate

JOHN P. ZELINA

Department of Chemistry, Box U-60, University of Connecticut, Storrs, CT 06269-4060, USA

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CHRISTOPHER K. NJUE

Department of Chemistry, Box U-60, University of Connecticut, Storrs, CT 06269-4060, USA

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JAMES F. RUSLING

Department of Chemistry, Box U-60, University of Connecticut, Storrs, CT 06269-4060, USA

Corresponding author: Department of Chemistry, Box U-60, University of Connecticut, Storrs, CT 06269-4060, USA.

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GEOFFREY N. KAMAU

Department of Chemistry, University of Nairobi, PO Box 30197, Nairobi, Kenya

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MIRIAM MASILA

Department of Chemistry, University of Nairobi, PO Box 30197, Nairobi, Kenya

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, and

JULIUS KIBUGU

Department of Chemistry, University of Nairobi, PO Box 30197, Nairobi, Kenya

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https://doi.org/10.1002/(SICI)1099-1409(199903)3:3<188::AID-JPP122>3.0.CO;2-ACited by:24 (Source: Crossref)

Abstract

Electronic absorption spectroscopy was used to measure the molecular association of copper phthalocyanine tetrasulfonate in micellar solutions, a microemulsion made with cationic surfactant, and homogeneous solvents. Analysis of absorbance versus concentration data using a multiple-aggregation model and non-linear regression analysis gave values of association constants, molar absorptivities and estimates of average aggregation number. Microemulsions and aqueous micellar solutions made with alkylammonium surfactants inhibited aggregation, probably because of interactions between the phthalocyanine sulfonate groups and the cationic surfactant head groups at interfacial surfaces. Similar aggregation behavior was observed previously in multiple-bilayer films of cationic surfactants. Water and aqueous solutions containing tetraethylammonium bromide or anionic SDS micelles provide environments facilitating extensive aggregation of Cu^IIPcTS⁴⁻. The major species are dimers in water and acetonitrile/water, but the formation of higher aggregates is promoted by addition of SDS or TEAB. Aprotic organic solvents provide environments intermediate between these two extremes, giving relatively large aggregation numbers (i.e. five to seven) but smaller association constants than aqueous media not containing cationic surfactants.

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