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Photophysical properties of 4,4-diaminodiphenyl sulfone in micelles and the role of BF-anion on micellar aggregation

Paper ID Volume ID Publish Year Pages File Format Full-Text
27859 44047 2012 8 PDF Available
Title
Photophysical properties of 4,4-diaminodiphenyl sulfone in micelles and the role of BF-anion on micellar aggregation
Abstract

The modulation of already established charge transfer (ICT) emission characteristics of 4,4′-diaminodiphenyl sulfone (Dapsone) in different micelles and also its further alterations due to physicochemical change of micelles in company with added room temperature ionic liquid (IL) have been elucidated in this paper with the help of steady state and time-resolved fluorescence spectroscopy. Dapsone seems to enter inside the cationic micelle beyond interfacial region, as evinced by the emission intensity enhancement and blue shift. In anionic micelle little intensity increase and the blue shift of Dapsone point to the presence of the probe near the interfacial region. From Cu2+ quenching study it has been confirmed that among the ionic micelles the probe makes shallow penetration in anionic micelle compared to that in cationic micelle. In non ionic surfactants the accessibility of the probe to the ionic quencher increases with increasing chain length. The probe's emission intensity is highest in non ionic Tween 20, but it starts decreasing with increasing alkyl chain length up to Tween 60 and it drastically reduces in Tween 80 nearly same as that in water. IL seems to affect the micellization of anionic, cationic and nonionic micelles differently resulting in shrinking and inflating the micellar size. The calculated rotational relaxation time of the micelle–probe complex is very slow compared to the probe rotation inside micelle.

Graphical abstractAddition of ionic liquid in probe–surfactant complex increases/decreases the sizes of the micellar complexes differently.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Interaction of ionic liquids on probe micellar photophysics. ► Encapsulation of probe in non-ionic micelles is hindered by the increasing chain length of the micelles. ► Decreases probe emission intensity in non-ionic micelle with increasing alkyl chain length which tends to that in water. ► Addition of IL to anionic and cationic micelles effects emission of probe differently downshift and upshift, respectively. ► Addition of IL causes a increase/decrease in diameter of micelles.

Keywords
Ionic liquid; Micelle; Dapsone; Anisotropy; Quenching
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Photophysical properties of 4,4-diaminodiphenyl sulfone in micelles and the role of BF-anion on micellar aggregation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 250, 15 December 2012, Pages 25–32
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us