Natural light harvesting complexes drive the first steps of photosynthesis, acting to absorb photons and transfer the excitation energy to reaction centers where charge separation can take place with a high quantum efficiency. Elucidating the mechanism of energy transfer and electron transfer in these complexes is essential to understanding their high quantum efficiencies and incorporating this information into design principles for artificial photosynthetic systems, photocatalysts, and organic photovoltaic materials. However, given the complexity of natural light harvesting complexes, there are still questions regarding the mechanism of energy and electron transfer in these systems, including the role of the local environment in these processes. In this talk, I will discuss our recent studies in this area where we apply ultrafast pump-probe and two-dimensional electronic spectroscopy to photosystem I, a natural light harvesting complex, and structurally simpler pi-extended metallodipyrrin complexes to probe energy transfer and charge transfer processes.

Probing energy and charge transfer in natural light harvesting complexes and model systems

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