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However, the proton\u2010deficient nature of alkaline water and the intolerance of COF linkages in strong alkaline conditions lead to insufficient H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    production by most COF\u2010based catalysts. Thus, developing novel COFs containing base\u2010triggered active sites is an effective strategy to maintain structural rigidity and photocatalytic efficiency. Herein, an indole\u2010linked COF (CityU\u201045) was prepared through the Cadogan\u2013Sundberg post\u2010synthetic reaction in a nitro\u2010containing sp\n                    <jats:sup>2<\/jats:sup>\n                    \u2010carbon COF (CityU\u201044). The formation of the indole linkage maintains its crystallinity, reduces the bandgap, and results in the redshift of fluorescent emission. Moreover, CityU\u201045 reveals an alkaline\u2010activated characteristic with a photocatalytic H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    rate up to 4854\u00a0\u00b5mol g\n                    <jats:sup>\u22121<\/jats:sup>\n                    h\n                    <jats:sup>\u22121<\/jats:sup>\n                    at pH\u00a0=\u00a013, which is six times higher than that in neutral conditions. This research demonstrated that indole\u2010linked COFs can be promising catalysts for photocatalytic H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    generation under alkaline conditions.\n                  <\/jats:p>","DOI":"10.1002\/anie.202522298","type":"journal-article","created":{"date-parts":[[2025,11,24]],"date-time":"2025-11-24T06:44:00Z","timestamp":1763966640000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Indole\u2010Linkages as Base\u2010Activated Sites in a Covalent Organic Framework for Efficient Photosynthesis of Hydrogen Peroxide Under Alkaline Conditions"],"prefix":"10.1002","volume":"65","author":[{"given":"Jinglun","family":"Yang","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering City University of Hong Kong Tat Chee Avenue  Kowloon Tong Hong Kong SAR P.R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yue","family":"Liu","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of Carbon Dioxide Resource Utilization School of Chemistry South China Normal University  Guangzhou 510000 P.R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zihao","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering City University of Hong Kong Tat Chee Avenue  Kowloon Tong Hong Kong SAR P.R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lei","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering City University of Hong Kong Tat Chee Avenue  Kowloon Tong Hong Kong SAR P.R. 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