Replicating photosynthesis in a laboratory setting promises significant benefits. Artificially harnessing solar energy could enable the conversion of atmospheric carbon dioxide into carbohydrates and other valuable compounds. Furthermore, as water splitting is part of photosynthesis, this approach holds potential for producing hydrogen fuel by isolating hydrogen and oxygen.
However, recreating this natural process is no simple task. Photosynthesis involves a series of complex reactions occurring in plant cells, mediated by a network of pigments, proteins, and molecules. Despite these challenges, research continues to make strides in mimicking nature's design.
A notable advance has been achieved by Professor Frank Wurthner, a chemist at Julius-Maximilians-Universitat (JMU) Wurzburg in Bavaria, Germany. His team successfully replicated one of the initial phases of photosynthesis using an engineered array of artificial dyes and conducted an in-depth analysis of the system's behavior.
This research, conducted in partnership with Professor Dongho Kim's laboratory at Yonsei University in Seoul, Korea, was recently published in the journal Nature Chemistry.
The team developed a dye assembly that closely resembles plant cell light-harvesting complexes. The synthetic structure captures light at one terminus, facilitates charge separation, and then transfers electrons progressively through a series of steps to the opposite end. This assembly features four perylene bisimide dye molecules arranged in a vertical stack.
"We can specifically trigger the charge transport in this structure with light and have analysed it in detail. It is efficient and fast. This is an important step towards the development of artificial photosynthesis," said JMU PhD student Leander Ernst, who was responsible for synthesising the stacked system.
Looking ahead, the JMU researchers plan to increase the number of dye components in their nanoscale stack to form a supramolecular wire. Such a structure would absorb sunlight and channel energy effectively across greater distances. Achieving this would mark significant progress toward new photofunctional materials that support artificial photosynthesis.
Research Report:Photoinduced stepwise charge hopping in p-stacked perylene bisimide donor-bridge-acceptor arrays.
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