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Fluorescence quenching of a poly(para-phenylene ethynylenes) by C60 fullerenes

Paper ID Volume ID Publish Year Pages File Format Full-Text
26748 43974 2012 6 PDF Available
Title
Fluorescence quenching of a poly(para-phenylene ethynylenes) by C60 fullerenes
Abstract

Complex formation between fullerenes and poly(para-phenylene ethynylene) (PPE) is studied through fluorescence quenching of PPE by C60. The influence of side chain chemistry, particularly with respect to electron donating capability, and molecular weight on the complex strength is examined in detail. Fluorescence quenching measurements indicate complex formation on the order of 103–104 dm3/mol, six orders of magnitude larger than previously studied C60–small organic molecule complexes and an order of magnitude larger than C60–cyclic polymer systems. No significant difference in complex strength was observed among PPEs with different side chain chemistry, indicating that C60 interaction occurs largely with the conjugated PPE backbone. At the lower PPE molecular weights investigated, the association constant for complex formation remains constant; however, an increase is observed at the highest molecular weight studied. We attribute this increase to the C60 molecule quenching more than one PPE unit at once, resulting in enhanced quenching at higher molecular weights and larger association constant. Based on the strength of interaction and lack of side group contribution to the interaction, we conclude that π–π interactions between the C60 cage and PPE backbone are responsible for the comparatively strong interactions observed.

► Fluorescence quenching has been used to study the complex formation. ► Complex formation larger than fullerene–small molecule systems previously studied. ► Polymer–fullerene complexation is independent of polymer side chain length. ► Fullerene interaction occurs predominantly with conjugated backbone. ► Larger association constants observed for high molecular weight polymers.

Keywords
Fluorescence quenching; Fullerenes; Conjugated polymers; Stern–Volmer Theory
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 249, 1 December 2012, Pages 41–46
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