A collaborative research team led by the Pacific Northwest National Laboratory has successfully observed the coordinated movement of protons and electrons during energy transfer reactions, marking a significant advancement in understanding molecular-level chemical processes. The findings, published in Nature Communications, resulted from investigations into proton-coupled electron transfer (PCET), a mechanism central to photosynthesis, cellular energy production, and various chemical transformations. The research employed advanced X-ray spectroscopy techniques at SLAC’s Linac Coherent Light Source combined with sophisticated quantum chemistry calculations and molecular dynamics simulations.
The coordinated motion of charged particles enables energy transfer with remarkable efficiency by allowing molecules to bypass intermediate energy-requiring steps, making reactions faster and more efficient. Researchers had previously studied these interactions for decades, but no earlier experiment had simultaneously captured both local electronic changes and structural information in a single investigation. The team, including scientists from multiple universities and national laboratories, focused on a light-triggered reaction involving a ruthenium-based molecule that absorbs light and captures a proton in acidic conditions.
The experimental approach combined two complementary X-ray measurement techniques: element-specific X-ray absorption spectroscopy demonstrated electron movement between molecular sites, while time-resolved X-ray scattering tracked atomic rearrangement and solvent molecule motion. The researchers for the first time demonstrated with structural sensitivity how a molecule’s electronic properties change at specific locations as it gains a proton while the surrounding water environment simultaneously reorganizes. Theoretical modeling proved essential for interpreting the complex data and revealing underlying electron and proton behavior.
The research addresses longstanding questions about the precise timing and sequence of electron and proton movement during PCET reactions and how the surrounding water network facilitates these processes. Understanding these mechanisms could facilitate development of improved catalysts, fuel cells, flow batteries, and other technologies for energy conversion and storage. The methodology provides researchers with new tools to investigate these fundamental chemical transformations and their practical applications across various energy-related technologies.
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