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

Singh, Yashapal and Raj, Mohan A and Kiran, BM and Nithyanandhan, J and Ramamurthy, V and Jayaraman, N (2016) A dendrimer facilitates resonance energy transfer between hydrophobic aromatic guest molecules in water. In: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 317 . pp. 125-131.

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Official URL: http://dx.doi.org/10.1016/j.jphotochem.2015.10.020

Abstract

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 similar to 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 similar to 330 nm to similar to 600 nm in aqueous solution. (C) 2015 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Keywords: Aromatics; Dendrimers; Fluorescence; Host-guest systems; Resonance energy transfer; Time-resolved fluorescence spectroscopy
Department/Centre: Division of Chemical Sciences > Organic Chemistry
Depositing User: Id for Latest eprints
Date Deposited: 29 Feb 2016 06:00
Last Modified: 29 Feb 2016 06:00
URI: http://eprints.iisc.ac.in/id/eprint/53302

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