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However, reported QD\u2010photocatalysts often contain highly\u2010toxic elements Cd or Pb, and have not surpassed prototypical transition\u2010metal complexes in terms of their photoredox power or excited\u2010state energy. Here we report low\u2010toxicity ZnSe\/ZnS core\/shell QDs as potent visible photocatalysts to drive challenging organic transformations. To overcome the limitation of short excited\u2010state lifetime of the QDs, we functionalize their surfaces with benzophenone ligands which can rapidly extract electrons from photoexcited QDs and sustain long\u2010lived charge\u2010separated states. The benzophenone anions function as potent electron relay to drive dehalogenation of aryl chlorides and additive\u2010free polymerization of acrylates. Alternatively, the QDs are functionalized with biphenyl ligands to store energy in long\u2010lived, energetic triplets, enabling [2+2] homo\u2010cycloaddition of styrene and cycloaddition of carbonyls with alkenes.<\/jats:p>","DOI":"10.1002\/anie.202213065","type":"journal-article","created":{"date-parts":[[2022,10,17]],"date-time":"2022-10-17T08:36:55Z","timestamp":1665995815000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["Low\u2010Toxicity ZnSe\/ZnS Quantum Dots as Potent Photoreductants and Triplet Sensitizers for Organic Transformations"],"prefix":"10.1002","volume":"61","author":[{"given":"Chengming","family":"Nie","sequence":"first","affiliation":[{"name":"State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences  Dalian Liaoning 116023 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