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A dendrimer facilitates resonance energy transfer between hydrophobic aromatic guest molecules in water

Paper ID Volume ID Publish Year Pages File Format Full-Text
26349 43948 2016 7 PDF Available
Title
A dendrimer facilitates resonance energy transfer between hydrophobic aromatic guest molecules in water
Abstract

•Dendrimer as the water-soluble host molecule.•Non-covalent dyes encapsulation in aqueous dendrimer medium.•Steady-state and time-resolved measurements of dyes in dendrimer host.•FRET processes of dye molecules inside dendrimer host.•Expanding the visible light absorption and emission wavelengths.

A water soluble third generation poly(alkyl aryl ether) dendrimer was examined for its ability to solubilize hydrophobic polyaromatic molecules in water and facilitate non-radiative resonance energy transfer between them. One to two orders of magnitude higher aqueous solubilities of pyrene (PY), perylene (PE), acridine yellow (AY) and acridine orange (AO) were observed in presence of a defined concentration of the dendrimer. A reduction in the quantum yield of the donor PY* emission and a partial decrease in lifetime of the donor excited state revealed the occurrence of energy transfer from dendrimer solubilized excited PY to ground state PE molecules, both present within a dendrimer. The energy transfer efficiency was estimated to be ∼61%. A cascade resonance energy transfer in a three component system, PY*-to-PE-to-AY and PY*-to-PE-to-AO, was demonstrated through incorporation of AY or AO in the two-component PY–PE system. In the three-component system, excitation of PY resulted in emission from AY or AO via a cascade energy transfer process. Careful choice of dye molecules with good spectral overlap and the employment of dendrimer as the medium enabled us to expand absorption-emission wavelengths, from ∼330 nm to ∼600 nm in aqueous solution.

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Keywords
Aromatics; Dendrimers; Fluorescence; Host–guest systems; Resonance energy transfer; Time-resolved fluorescence spectroscopy
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A dendrimer facilitates resonance energy transfer between hydrophobic aromatic guest molecules in water
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 317, 15 February 2016, Pages 125–131
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