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Photobehaviour of some 1-heteroaryl-2-(1-methylpyridinium-2-yl)ethene iodides (free and complexed with DNA)

Paper ID Volume ID Publish Year Pages File Format Full-Text
29213 44133 2006 6 PDF Available
Title
Photobehaviour of some 1-heteroaryl-2-(1-methylpyridinium-2-yl)ethene iodides (free and complexed with DNA)
Abstract

The fluorescence emission and the photoreactivity of three trans-1-heteroaryl-2-(1-methylpyridinium-2-yl)ethene iodides, where the heteroaryl group is thiophen-2-yl, 5-bromothiophen-2-yl or 1-methylpyrrol-2-yl, have been investigated in water and acetonitrile (MeCN). The main relaxation pathway of the lowest excited singlet states of these compounds leads to trans → cis photoisomerization with high quantum yields, particularly for the two thiophen derivatives. The intervention of a thermal isomerization, important only above room temperature, was observed in acetonitrile. The yield of the radiative deactivation is very small and becomes substantial in rigid matrices at low temperature only. Preliminary experiments on the binding of these pyridinium salts to DNA and on its effect on the photoreactivity showed a modest binding affinity to DNA with formation of complexes which did not affect significantly the photoisomerization process.

Keywords
Diarylethenes; Photoisomerization; Push–pull compounds; Interactions with DNA
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Photobehaviour of some 1-heteroaryl-2-(1-methylpyridinium-2-yl)ethene iodides (free and complexed with DNA)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 179, Issue 3, 15 April 2006, Pages 314–319
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
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Any Questions? feel free to contact us