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Rebecca Wilson1 Savannah Kapper1 Peter Djurovich1 Mark Thompson1

1, University of Southern California, Los Angeles, California, United States

The abundance of solar energy makes it the premier alternative to fossil fuels as an energy source. Multiple approaches are taken for solar harvesting and storage, one being mimicking photosynthesis for water splitting. This has three basic parts: light collection, energy tunneling to the catalytic core, followed by electron transfer to the photocatalyst to convert water to hydrogen and oxygen. Facile molecular designs for donor-acceptor (D-A) dyads is critical for light absorption and energy transfer in photocatalytic systems. Forming dyads, and higher order assemblies often involves complicated synthetic schemes. This assembly was achieved in a simple, high fidelity process, through the coordination of chiral bisoxazolines (BOX) to zinc metal centers. Previous reports have demonstrated chiral discrimination between enantiomers of the BOX ligands upon formation of zinc complexes, with the heterochiral complex being the sole orientation in a racemic mixture. The meso-position of two enantiomers of BOX complexes was appended with chromophores to study exciton coupling and electron transfer between them in this self-assembled dyad. Exciton coupling was measured through uv-vis absorption, fluorescence spectroscopy, quantum yield and lifetime studies.

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