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Herein, we describe the synthesis, isolation, and structural characterization of two platinum(II) peroxycarbonate complexes Pt(PPh\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    (CO\n                    <jats:sub>4<\/jats:sub>\n                    ) (\n                    <jats:bold>1<\/jats:bold>\n                    ) and Pt(dppe)(CO\n                    <jats:sub>4<\/jats:sub>\n                    ) (\n                    <jats:bold>2<\/jats:bold>\n                    ) (dppe = 1,2\u2010bis(diphenylphosphino)ethane). Whereas the complexes are thermally stable, they react by oxygen\u2010atom transfer (OAT) when irradiated with visible light. This photoreactivity was investigated using NMR and FT\u2010IR photolysis to identify structures of reaction intermediates and photoproducts, together with kinetic analyses, which establish unimolecular OAT from the CO\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>2\u2212<\/jats:sup>\n                    ligand to the bound phosphine. In addition to providing rare examples of structurally characterized M(CO\n                    <jats:sub>4<\/jats:sub>\n                    ) complexes, this work is the first demonstration of photochemical reactivity in a peroxycarbonate complex.\n                  <\/jats:p>","DOI":"10.1002\/anie.5181266","type":"journal-article","created":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T11:21:51Z","timestamp":1790248911000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Photochemical Oxygen\u2010Atom\u2010Transfer Reactivity of Platinum(II) Peroxycarbonates"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0862-3072","authenticated-orcid":false,"given":"Meghan G.","family":"Sullivan","sequence":"first","affiliation":[{"name":"Department of Chemistry and Chemical Biology Harvard University  Cambridge Massachusetts USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6331-7940","authenticated-orcid":false,"given":"Jesse B.","family":"Gordon","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Chemical Biology Harvard University  Cambridge Massachusetts USA"},{"name":"Present address: Department of Chemistry Northwestern University  Evanston Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9359-9862","authenticated-orcid":false,"given":"Brandon M.","family":"Campbell","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Chemical Biology Harvard University  Cambridge Massachusetts USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6432-9943","authenticated-orcid":false,"given":"Shao\u2010Liang","family":"Zheng","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Chemical Biology Harvard University  Cambridge Massachusetts USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5055-320X","authenticated-orcid":false,"given":"Daniel G.","family":"Nocera","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Chemical Biology Harvard University  Cambridge Massachusetts USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,24]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"crossref","DOI":"10.1007\/978-1-4613-0955-0","volume-title":"Oxygen Complexes and Oxygen Activation by Transition Metals","author":"Martell A. 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