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Photophysics and self-assembly of symmetrical and unsymmetrical cationic oligophenylene ethynylenes

Paper ID Volume ID Publish Year Pages File Format Full-Text
27296 44015 2009 3 PDF Available
Title
Photophysics and self-assembly of symmetrical and unsymmetrical cationic oligophenylene ethynylenes
Abstract

A study of the synthesis, photophysical behavior and self-assembly of a series of symmetrical cationic oligophenylene ethynylenes is reported. Aqueous solutions of all these compounds exhibit strong and structured absorption in the ultraviolet (maxima near 305 nm and 355 nm) with a broad fluorescence in the range 370–600 nm. While all of these compounds show strong fluorescence in methanol, the fluorescence yields in water are variable and substituent dependent. Transient absorption, presumably attributable to a triplet is found for all of the oligomers studied thus far. All of the compounds having a net positive charge exhibit strong complex formation when they are added to aqueous solutions containing the anionic biopolymer carboxymethylcellulose. The complexes are characterized by a pronounced red shift in the oligomer absorption spectrum and a red shifted and generally intense fluorescence. We attribute the spectral shifts due to the formation of “J-dimers” in each case. The results of this preliminary study suggest that these compounds may be useful in sensing due to their strong tendency to associate with anionic biomacromolecules.

Keywords
Photophysics; Self-assembly; Oligophenylene ethynylenes; Cationic polyelectrolytes; Carboxymethylcellulose; Carboxymethylamylose; J-dimers
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Photophysics and self-assembly of symmetrical and unsymmetrical cationic oligophenylene ethynylenes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 207, Issue 1, 5 September 2009, Pages 4–6
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