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Effect of neutral salts on the excited state proton transfer in the fluorescent probe anchored to the uncharged micelles

Paper ID Volume ID Publish Year Pages File Format Full-Text
25996 43926 2016 10 PDF Available
Title
Effect of neutral salts on the excited state proton transfer in the fluorescent probe anchored to the uncharged micelles
Abstract

•The salt addition inhibits excited state proton transfer in the fluorescent probe bound to micelles.•The observed salt effect is due to anion accumulation near the nonionic particle surface.•The thiocyanate ions exhibit much stronger effect than chlorides.•The anion effect is due to a synergism between the ion polarizability and hydrophobicity.

We study the salt effect on the excited state proton transfer (ESPT) in the fluorescent probe of 2-hydroxynaphthalene (dodecylo)-6-sulphonamide (NSDA) anchored on the nonionic Brij35 micelles. The results of spectrofluorimetric, electrophoretic and equilibrium dialysis measurements, allowed us to explain the variations in the ESPT rate constants in the presence of different neutral salts (NaCl, KCl, KSCN, NH4SCN) as resulting from anion accumulation at the particle surface. Similarly to electric double layer in the charged micelles, an ionic layer system is also formed around the nonionic micelles. The dimensions of anionic and cationic layers as well as those of the whole ionic envelope around the nonionic particles are estimated. Furthermore, the electric potential generated within the ionic layer system and acting on the proton dissociating from the probe is determined and interpreted. Different impact of Cl− and SCN− ions on photophysical parameters of the targeted system have been explained through a synergy effect between hydrophobicity and polarizability of anions adsorbing on the nonionic micelle surface.Taking into account the existing analogy between micelles and living cells, we can assume that these results will contribute to a better understanding of salt effect in such important biological phenomena as the cell adhesion to surfaces, thermal denaturation of proteins and the aggregation of erythrocytes.

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Keywords
Fluorescence; 2-Naphthol derivative bound to micelles; Excited state proton transfer; Nonionic micelles; Salt impact on micelles
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Effect of neutral salts on the excited state proton transfer in the fluorescent probe anchored to the uncharged micelles
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 329, 1 October 2016, Pages 203–212
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
Online Support
Any Questions? feel free to contact us