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Novel cyanine dyes as fluorescent pH sensors: PET, ICT mechanism or resonance effect?

Paper ID Volume ID Publish Year Pages File Format Full-Text
28136 44061 2007 8 PDF Available
Title
Novel cyanine dyes as fluorescent pH sensors: PET, ICT mechanism or resonance effect?
Abstract

Cyanine and related polymethine dyes have been widely used as fluorescent and phosphorescent dyes for biological investigations. But the mechanism of this kind of cyanine dye as pH sensor is still not clear. In this paper, two groups of cyanine dyes were designed and synthesized, each including two asymmetry cyanine dyes and one symmetry dye. The UV–vis and fluorescent spectra of compounds Ia–b and IIa–b were recorded in phosphate buffers with different pH value. It was found that these compounds could be used as a kind of pH sensors with high pKa value. The calculation on structures or conformations of compounds Ia–b, IIa–b and Ic before and after protonation revealed that the planar conjugations were different between non-protonic and protonic forms. It implied that the change from PET to ICT system was possible in the process of binding between polymethine cyanine dyes and proton.

Keywords
Cyanine dyes; Fluorescent pH sensors; PET mechanism; ICT mechanism; Resonance effect
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Novel cyanine dyes as fluorescent pH sensors: PET, ICT mechanism or resonance effect?
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 190, Issue 1, 5 July 2007, Pages 1–8
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