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Title:Energy Transfer In A Synthetic Dendron-based Light Harvesting System
Author(s):Nienhaus, Lea
Contributor(s):Gruebele, Martin
Subject(s):Mini-symposium: Spectroscopy in Kinetics and Dynamics
Abstract:\begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.5]{ismsfigure.eps} \end{wrapfigure} Single molecule experiments based on Förster resonance energy transfer (FRET) are now capable of detecting energy funneling in branched molecules. Here we present the synthesis, as well as the optical characterization of a dendron coupled to two donor dyes (Cy3) and one acceptor dye (Cy5). Characterization of the dendron by ensemble absorption and emission spectroscopy shows that the molecule is capable of light harvesting; yielding a FRET signal from the acceptor that is greater than expected for a single donor. Additionally, we investigated an energy transfer cascade upon UV excitation of the conjugated backbone, resulting in several competing energy transfer pathways with the same total energy transfer as direct FRET. The first pathway is FRET from the backbone to Cy3 and resulting FRET to Cy5, with the competing pathway that allows direct energy transfer to Cy5 from the backbone via superexchange. Structural simulations in solution, as well as direct imaging by scanning tunneling microscopy show that the dyes can fold over onto the dendron, creating a heterogeneous distribution of conformations suitable for imaging single molecule studies of light harvesting.
Issue Date:2014-06-17
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:Nienhaus, L.; Gruebele, M. ENERGY TRANSFER IN A SYNTHETIC DENDRON-BASED LIGHT HARVESTING SYSTEM. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.TH07
Genre:Conference Paper / Presentation
Rights Information:Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License.
Date Available in IDEALS:2014-09-17

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