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Integrating DNA-Photonic Wires into Light-Harvesting Supramolecular Polymers Mariusz Kownacki, Simon M. Langenegger, Shi-Xia Liu, and Robert Häner.
Angewandte Chemie 2018 October 25
An approach combining DNA nanoscaffolds with supramolecular polymers for the efficient and directional propagation of light-harvesting cascades has been developed. A series of photonic wires with different arrangements of fluorophores in DNA-organized nanostructures were linked to light-harvesting supramolecular phenanthrene polymers (SPs) in a self-assembled fashion. Among them, a light harvesting complex (LHC) composed of SPs and a photonic wire of phenanthrene, Cy3, Cy5 and Cy5.5 chromophores reveals a remarkable energy transfer efficiency of 59%. Stepwise transfer of the excitation energy collected by the light-harvesting SPs via the intermediate Cy3 and Cy5 chromophores to the final Cy5.5 acceptor proceeds by a Förster resonance energy transfer mechanism. In addition, the light-harvesting properties are documented by antenna effects ranging from 1.4 up to 23 for different LHCs.
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