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

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• 作者：Palwinder Kaur ; Mingyan Wu ; Laura Anzaldi ; David H. Waldeck ; Cuihua Xue ; Haiying Liu
• 刊名：Langmuir
• 出版年：2007
• 出版时间：December 18, 2007
• 年：2007
• 卷：23
• 期：26
• 页码：13203 - 13208
• 全文大小：176K
• 年卷期：v.23,no.26(December 18, 2007)
• ISSN：1520-5827

文摘

This study investigates the fluorescence quenching of a poly(p-phenyleneethynylene) (1) based polyelectrolyte bypositively charged and neutral macromolecules. This work shows that the change in the fluorescence yield of 1 dependson a number of factors, including electrostatic, hydrophobic, and energy transfer interactions with the quencher andalso changes in the solution conditions such as concentration and ionic strength. The fluorescence quenching isattributed to the formation of aggregates that form upon addition of different quenchers to a solution of 1 and/or thesolution conditions. The extent of 1's aggregation is shown to depend on the type of interaction between the polymerand the quencher, the concentration of the polymer, and the ionic strength of the solution.