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Study on the interaction between nitroxide free radical and conjugated polyelectrolytes by fluorimetry

✍ Scribed by Wenchao Dou; Xingguang Su

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
285 KB
Volume
24
Category
Article
ISSN
1522-7235

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✦ Synopsis

Abstract

In this work, we studied the fluorescence quenching of the anionic conjugated polyelectrolyte PPE–SO~3~ by the paramagnetic species 2,2,6,6‐tetramethylpiperidine‐N‐oxide free radical (TEMPO) in aqueous solution. At low quencher concentration the Stern–Volmer constant is 94 mol/L; as the quencher concentration increases the Stern–Volmer plots become superlinear. Ascorbic acid is used to reduce TEMPO to the corresponding hydroxylamine and the PPE–SO~3~ fluorescence is fully recovered. Under a large excess of ascorbic acid over TEMPO, the rise of fluorescence followed pseudo‐first‐order kinetics. The second‐order rate constant calculated from this time course is 0.7 mol/L/s. Copyright © 2008 John Wiley & Sons, Ltd.

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## Abstract 2‐D chromatography with gradient polymer elution chromatography in the first dimension was used to characterize a series of block copolymers prepared by nitroxide‐mediated controlled free‐radical seeded emulsion polymerization. The data provide a detailed picture of the different popula