Dependence of Fluorescence Quenching of a Poly(p-phenyleneethynylene) Polyelectrolyte on the Electrostatic and Hydrophobic Properties of the Quencher

This study investigates the fluorescence quenching of a poly(p-phenyleneethynylene) (1) based polyelectrolyte by positively charged and neutral macromolecules. This work shows that the change in the fluorescence yield of 1 depends on a number of factors, including electrostatic, hydrophobic, and ene...

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Bibliographic Details
Published in:Langmuir 2007-12, Vol.23 (26), p.13203-13208
Main Authors: Kaur, Palwinder, Wu, Mingyan, Anzaldi, Laura, Waldeck, David H., Xue, Cuihua, Liu, Haiying
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Surface physical chemistry
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Summary:This study investigates the fluorescence quenching of a poly(p-phenyleneethynylene) (1) based polyelectrolyte by positively charged and neutral macromolecules. This work shows that the change in the fluorescence yield of 1 depends on a number of factors, including electrostatic, hydrophobic, and energy transfer interactions with the quencher and also changes in the solution conditions such as concentration and ionic strength. The fluorescence quenching is attributed to the formation of aggregates that form upon addition of different quenchers to a solution of 1 and/or the solution conditions. The extent of 1's aggregation is shown to depend on the type of interaction between the polymer and the quencher, the concentration of the polymer, and the ionic strength of the solution.
ISSN:0743-7463
1520-5827
DOI:10.1021/la7023007