Probing the interface polarity of AOT reversed micelles using centro-symmetrical squaraine molecules

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Publication Date
DOI 10.1039/A905100G
Impact Factor 3.676
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Abstract

The solvatochromism of both absorption and emission spectra of two centro-symmetrical squaraine dyes was studied in pure solvents, dioxane–water mixtures and AOT (Aerosol OT, bis(2-ethylhexyl)sodium sulfosuccinate) reversed micelles. The shifts observed in pure solvents are relatively large and are associated with non-negligible solute–solvent polar interactions. Good empirical correlations with the π* polarity scale (a measure of the solvent dipolar character) and with the solvent proticity α scale (a measure of the solvent acidity character) were obtained. Preferential solvation by water was not observed in the dioxane–water mixtures enabling the calculation of π*, α and ET30 polarity scale values, the latter in a good agreement with literature values. Similar trends of these parameters in AOT reversed micelles were found, but some deviations are observed at low water contents due to probe distribution at two different interfacial sites.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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