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We have a poor understanding of how the reaction center facilitates water oxidation in photosystem II and the roles that mono\u2010 and\/or multimeric chlorophyll groups play when P680 oxidizes a neighboring tyrosine in order to drive water oxidation at the oxygen evolving complex. We have prepared a dimeric Mg\n                    <jats:sup>II<\/jats:sup>\n                    \u2010porphyrin complex [Mg\n                    <jats:sub>2<\/jats:sub>\n                    (BTPP)] (\n                    <jats:bold>1<\/jats:bold>\n                    , H\n                    <jats:sub>4<\/jats:sub>\n                    \u2010BTPP=1,2\u2010bis\u2010(10,15,20\u2010triphenylporphyrin\u20105\u2010yl)\u2010benzene) as a structural and functional mimic of the dimeric core of P680.\n                    <jats:bold>1<\/jats:bold>\n                    was oxidized by one\u2010electron to the corresponding \u03c0\u2010cation radical complex\n                    <jats:bold>2<\/jats:bold>\n                    . The radical cation was characterized by UV\/Vis\u2010NIR, FT\u2010IR, and EPR spectroscopic techniques.\n                    <jats:bold>2<\/jats:bold>\n                    was shown to be reactive towards phenols to give the corresponding phenoxyl radicals, mimicking the reactivity of the P680 cation radical which oxidizes tyrosine to tyrosyl radical. Critically, the dimeric \u03c0\u2010cation radical showed markedly higher rates of proton coupled electron transfer oxidation (PCET) of phenols when compared to its monomeric counterpart [Mg(TPP)] (TPP=5,10,15,20\u2010tetraphenylporphyrin). Our findings demonstrate that Mg\n                    <jats:sup>II<\/jats:sup>\n                    \u2010porphyrin complexes are reliable mimics of photosynthetic PCET processes and suggest that photosynthetic reaction centers with multiple \u03c0\u2010conjugated complexes likely lower the barrier to PCET oxidation by \u03c0\u2010cation radical species.\n                  <\/jats:p>","DOI":"10.1002\/anie.202415688","type":"journal-article","created":{"date-parts":[[2024,10,23]],"date-time":"2024-10-23T08:24:03Z","timestamp":1729671843000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["A Structural and Functional Mimic of P680\n                    <sup>+<\/sup>"],"prefix":"10.1002","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9895-6865","authenticated-orcid":false,"given":"Sachidulal","family":"Biswas","sequence":"first","affiliation":[{"name":"School of Chemistry, Trinity College Dublin The 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Ireland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,11,19]]},"reference":[{"key":"e_1_2_7_1_1","unstructured":"\u00a0"},{"key":"e_1_2_7_2_2","doi-asserted-by":"publisher","DOI":"10.1021\/ar900267k"},{"key":"e_1_2_7_3_2","doi-asserted-by":"publisher","DOI":"10.1021\/ar900209b"},{"key":"e_1_2_7_4_2","doi-asserted-by":"publisher","DOI":"10.1039\/B802262N"},{"key":"e_1_2_7_5_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-030-67407-6"},{"key":"e_1_2_7_6_1","unstructured":"\u00a0"},{"key":"e_1_2_7_7_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr0204294"},{"key":"e_1_2_7_8_2","doi-asserted-by":"publisher","DOI":"10.1021\/ar3003249"},{"key":"e_1_2_7_9_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr4004874"},{"key":"e_1_2_7_10_1","unstructured":"\u00a0"},{"key":"e_1_2_7_11_2","doi-asserted-by":"publisher","DOI":"10.1098\/rstb.2002.1186"},{"key":"e_1_2_7_12_2","first-page":"107","volume":"2012","author":"Kargul 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