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We combine femtosecond optical spectroscopy, ultrafast N K-edge X-ray absorption spectroscopy, and time-resolved X-ray solution scattering to capture the steps of a sequential PCET reaction in water with atomic-site specificity. Using a ruthenium polypyridyl model complex, we resolve the electron redistribution upon photoinduced metal-to-ligand charge transfer and subsequent (\u00a0~\u00a0460 ps) protonation at a ligand nitrogen, as well as the concomitant rearrangement of the first-solvation-shell. Combined with advanced electronic structure and molecular dynamics simulations, our measurements reveal a marked localization of the excited-state electron density at the protonated N site, together with a switch from N\u00b7\u00b7\u00b7HO to NH\u00b7\u00b7\u00b7O hydrogen-bonds. These results establish a multimodal X-ray framework for mechanistic insight into PCET and its control in catalysis, artificial photosynthesis, and biological energy flow.<\/jats:p>","DOI":"10.1038\/s41467-026-75943-4","type":"journal-article","created":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T10:43:17Z","timestamp":1787740997000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Electronic and solvent reorganization in proton-coupled electron transfer captured by ultrafast 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