biostudies-literatureUnknown8(20)Matsuda SPrecise separation and purification of f-block elements are important and challenging especially for the reduction of nuclear waste and the recycling of rare metals but are practically difficult mainly because of their chemical similarity. A promising way to overcome this difficulty is controlling their oxidation state by nonchemical processes. Here, we show resonance-enhanced multiphoton charge transfer in actinide complexes, which leads to element-specific control of their oxidation states owing to the distinct electronic spectra arising from resonant transitions between f orbitals. We observed oxidation of trivalent americium in nitric acid. In addition, we found that the coordination of nitrates is essential for promoting the oxidation reaction, which is the first finding ever relevantScience advanceseabn1991https://www.ebi.ac.uk/biostudies/studies/S-EPMC9116592biostudies-literatureMarking actinides for separation: Resonance-enhanced multiphoton charge transfer in actinide complexes.PMC9116592Shimojo KNakashima NDoi RSimonnet MMatsuda SHonda MKobayashi TSekiguchi TYokoyama KYaita TKaneta YfalseMarking actinides for separation: Resonance-enhanced multiphoton charge transfer in actinide complexes.Precise separation and purification of f-block elements are important and challenging especially for the reduction of nuclear waste and the recycling of rare metals but are practically difficult mainly because of their chemical similarity. A promising way to overcome this difficulty is controlling their oxidation state by nonchemical processes. Here, we show resonance-enhanced multiphoton charge transfer in actinide complexes, which leads to element-specific control of their oxidation states owing to the distinct electronic spectra arising from resonant transitions between f orbitals. We observed oxidation of trivalent americium in nitric acid. In addition, we found that the coordination of nitrates is essential for promoting the oxidation reaction, which is the first finding ever relevant2022-01-01T00:00:00Z2022 May2025-04-25T18:02:03.527Z2025-04-25T18:02:03.527ZS-EPMC91165923558422210.1126/sciadv.abn1991