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A Complex Comprising a Cyanine Dye Rotaxane and a Porphyrin Nanoring as a Model Light-Harvesting System |
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| Authors: | Jiratheep Pruchyathamkorn Dr. William J. Kendrick Dr. Andrew T. Frawley Andrea Mattioni Dr. Felipe Caycedo-Soler Prof. Susana F. Huelga Prof. Martin B. Plenio Prof. Harry L. Anderson |
| Affiliation: | 1. Department of Chemistry, Oxford University, Chemistry Research Laboratory, Oxford, OX1 3TA UK;2. Institute of Theoretical Physics and IQST, Ulm University, Albert-Einstein-Allee 11, 89069 Ulm, Germany |
| Abstract: | A nanoring-rotaxane supramolecular assembly with a Cy7 cyanine dye (hexamethylindotricarbocyanine) threaded along the axis of the nanoring was synthesized as a model for the energy transfer between the light-harvesting complex LH1 and the reaction center in purple bacteria photosynthesis. The complex displays efficient energy transfer from the central cyanine dye to the surrounding zinc porphyrin nanoring. We present a theoretical model that reproduces the absorption spectrum of the nanoring and quantifies the excitonic coupling between the nanoring and the central dye, thereby explaining the efficient energy transfer and demonstrating similarity with structurally related natural light-harvesting systems. |
| Keywords: | Cyanine dyes excitonic coupling light harvesting porphyrin rotaxanes |