What question did this study set out to answer?

To determine the mechanism governing pH-dependent fluorescence quenching in anthracene-labeled poly(2-vinylpyridine) across varying degrees of protonation.

January 24, 2004Macromolecules

pH-Induced Fluorescence Quenching of Anthracene-Labeled Poly(2-vinylpyridine)

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Authors

JCJohn H. ClementsThe University of Texas at Austin SWS. E. WebberGeneral Electric (United States)

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Implication

Spectroscopic analysis demonstrates protonation-dependent fluorescence quenching in labeled poly(2-vinylpyridine), indicating preferential local protonation and structural changes.

Key Points

To determine the mechanism governing pH-dependent fluorescence quenching in anthracene-labeled poly(2-vinylpyridine) across varying degrees of protonation.
Monitored fluorescence intensity of mid- and end-tagged anthracene-labeled poly(2-vinylpyridine) across varying degrees of protonation in acidic aqueous and unprotonated methanol solutions.
Modeled quenching behavior using a Bernoullian statistical framework based on the protonation state of nearest-neighbor pyridine units.
Quenching occurs through electron transfer from excited anthracene to adjacent pyridinium units in acidic aqueous solution, whereas unprotonated chains in methanol exhibit no appreciable quenching.
Qualitative fitting to a Bernoullian statistical model requires preferential protonation of pyridine units directly adjacent to the anthracene chromophore compared to distant chain positions.
A slope change in the relative fluorescence versus protonation curve at degrees of protonation between 0.42 and 0.45 indicates an intrapolymer conformational transition.

Cite This Study

Clements et al. (2004) studied this question.

synapsesocial.com/papers/6aa3841bcd95457965c60cd2 https://doi.org/10.1021/ma035749j

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Implication

Spectroscopic analysis demonstrates protonation-dependent fluorescence quenching in labeled poly(2-vinylpyridine), indicating preferential local protonation and structural changes.

pH-Induced Fluorescence Quenching of Anthracene-Labeled Poly(2-vinylpyridine)

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Implication

Key Points

Cite This Study

pH-Induced Fluorescence Quenching of Anthracene-Labeled Poly(2-vinylpyridine)

Discussion

Member takes

Implication

Key Points

Cite This Study

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