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Spectral and photophysical properties of fluorone dyes in bio-related films and methanol

Paper ID Volume ID Publish Year Pages File Format Full-Text
27819 44044 2009 10 PDF Available
Title
Spectral and photophysical properties of fluorone dyes in bio-related films and methanol
Abstract

The fluorone dyes fluorescein, 4,5-dibromofluorescein, eosin Y, erythrosine B, and rose bengal in the biological materials gelatin, starch, and chitosan have been characterized by absorption and emission spectroscopy. Comparative studies were carried out for the same dyes in methanol. The absorption cross-section spectra, luminescence quantum distributions, luminescence quantum yields, fluorescence quantum yields, and degrees of luminescence polarization were determined by steady-state spectroscopy. The fluorescence lifetimes were measured by time-resolved laser experiments. High fluorescence quantum yields were obtained for fluorescein in both the solid hosts and the liquid solutions. The fluorescence reduction due to enhancement of intersystem crossing by heavy atom spin-orbit coupling was efficient both in the biofilms and in methanol. Room temperature phosphorescence emission was observed for the heavy atom substituted fluorescein derivatives in the biofilms. The spectroscopic behavior of the fluorone dyes depends on their ionic state with highest luminescence efficiency for the dianionic forms. This form was realized for all investigated dyes in basic methanol and in most cases also in the biofilms.

Keywords
83.80.Rs; 33.50.−jFluorone dyes; Fluorescein; Dibromofluorescein; Eosin Y; Erythrosine B; Rose bengal; Biofilms; Gelatin; Starch; Chitosan; Absorption cross-sections; Luminescence quantum distributions; Fluorescence lifetimes; Phosphorescence
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Spectral and photophysical properties of fluorone dyes in bio-related films and methanol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 208, Issues 2–3, 15 December 2009, Pages 131–140
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