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Structure and fluorescence properties of indole cyanine and merocyanine dyes with partially locked polymethine chain

Paper ID Volume ID Publish Year Pages File Format Full-Text
28977 44112 2008 8 PDF Available
Title
Structure and fluorescence properties of indole cyanine and merocyanine dyes with partially locked polymethine chain
Abstract

The fluorescent properties of a series of symmetric cationic cyanine dyes and merocyanines with trimethylene bridge connecting N-atom of the indole residue with α-position of the polymethine chain have been explored in detail. It is shown that the constraining group influences their fluorescent properties both by steric and electronic effects. It revealed an essential decrease of the fluorescence quantum yields of the constrained symmetric cyanine dyes in comparison with those of their analogues without bridge group in their chromophore. This effect diminishes essentially at polymethine chain lengthening. In the case of merocyanines the bridge group can cause a decrease as well a substantial increase of their fluorescence quantum yields depending on their type of solvatochromism and solvent polarity. The conclusions made on the basis of the experimental data are in good agreement with the results of semiempirical quantum-chemical calculations.

Keywords
Cyanine dyes; Merocyanines; Fluorescence; Fluorescence quantum yield; Solvatofluorochromism; Bridge groups; Electronic structure
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Structure and fluorescence properties of indole cyanine and merocyanine dyes with partially locked polymethine chain
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 200, Issues 2–3, 15 December 2008, Pages 106–113
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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Price after discount Only $4.95
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