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As ideal molecular models of nanoceria, atom\u2010precise cerium\u2010oxo clusters (COCs) hold great promise in determining the accurate Ce\n                    <jats:sup>III<\/jats:sup>\n                    \/Ce\n                    <jats:sup>IV<\/jats:sup>\n                    ratio and disclosing the underlying catalytic mechanism. However, the number of COCs, especially those mixed\u2010valent COCs with high surface Ce\n                    <jats:sup>III<\/jats:sup>\n                    concentrations, is very limited on account of their formidable synthetic challenges. Herein, we report the first silsesquioxane\u2010protected COC,\n                    <jats:bold>Ce13<\/jats:bold>\n                    , featuring a fluorite\u2010type Ce\n                    <jats:sub>13<\/jats:sub>\n                    O\n                    <jats:sub>8<\/jats:sub>\n                    core, which is structurally reminiscent of bulk ceria. The cluster exhibits a substantially high Ce\n                    <jats:sup>III<\/jats:sup>\n                    \/Ce\n                    <jats:sup>IV<\/jats:sup>\n                    ratio with one central Ce\n                    <jats:sup>IV<\/jats:sup>\n                    encapsulated by twelve surface\u2010exposed Ce\n                    <jats:sup>III<\/jats:sup>\n                    atoms, serving as a molecular analogue of highly reduced ceria surfaces. This cluster shows strong light\u2010harvesting ability that covers the entire visible range and demonstrates high photocatalytic activity and selectivity for oxidative coupling of various amines, where superoxide radical was involved using O\n                    <jats:sub>2<\/jats:sub>\n                    as the oxidant at room\u2010temperature under visible light. The surface Ce\n                    <jats:sup>III<\/jats:sup>\n                    sites are proposed to significantly enhance the adsorption and activation of O\n                    <jats:sub>2<\/jats:sub>\n                    . These results highlight the potential of\n                    <jats:bold>Ce13<\/jats:bold>\n                    as an efficient sustainable photocatalyst for organic transformations.\n                  <\/jats:p>","DOI":"10.1002\/smll.75013","type":"journal-article","created":{"date-parts":[[2026,8,8]],"date-time":"2026-08-08T07:18:42Z","timestamp":1786173522000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Fluorite\u2010Type Silsesquioxane\u2010Protected Cerium Cluster as Molecular Analog of Highly Reduced Nanoceria Fragment for Efficient Photocatalysis"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8417-0597","authenticated-orcid":false,"given":"Kai","family":"Sheng","sequence":"first","affiliation":[{"name":"School of Chemistry and Chemical Engineering Shandong University  Jinan People's Republic of China"},{"name":"School of Aeronautics Shandong Jiaotong University  Jinan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qi","family":"Shen","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering Liaocheng University  Liaocheng People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5063-8825","authenticated-orcid":false,"given":"Xianqiang","family":"Huang","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering Liaocheng University  Liaocheng People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5701-3449","authenticated-orcid":false,"given":"Rakesh Kumar","family":"Gupta","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering Shandong University  Jinan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4274-2796","authenticated-orcid":false,"given":"Mohammad","family":"Azam","sequence":"additional","affiliation":[{"name":"Department of Chemistry College of Science King Saud University  Riyadh Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3136-3675","authenticated-orcid":false,"given":"Alexey","family":"Bilyachenko","sequence":"additional","affiliation":[{"name":"A. N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences  Moscow Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5966-1207","authenticated-orcid":false,"given":"Di","family":"Sun","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering Shandong University  Jinan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen\u2010Ho","family":"Tung","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering Shandong University  Jinan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8315-3501","authenticated-orcid":false,"given":"Zhi","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering Shandong University  Jinan People's Republic of 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