期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 49, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202213065
关键词
Nontoxic Quantum Dots; Organic Photochemistry; Single Electron Transfer; Time-Resolved Spectroscopy; Triplet Energy Transfer
资金
- National Natural Science Foundation of China [22173098, 21975253]
- Chinese Academy of Sciences [YSBR-007]
- Dalian Institute of Chemical Physics [DICP I201914]
In this study, low-toxicity ZnSe/ZnS core/shell quantum dots (QDs) were reported as potent visible photocatalysts to drive challenging organic transformations.
Colloidal quantum dots (QDs) can photocatalyze diverse organic reactions. However, reported QD-photocatalysts often contain highly-toxic elements Cd or Pb, and have not surpassed prototypical transition-metal complexes in terms of their photoredox power or excited-state energy. Here we report low-toxicity ZnSe/ZnS core/shell QDs as potent visible photocatalysts to drive challenging organic transformations. To overcome the limitation of short excited-state lifetime of the QDs, we functionalize their surfaces with benzophenone ligands which can rapidly extract electrons from photoexcited QDs and sustain long-lived charge-separated states. The benzophenone anions function as potent electron relay to drive dehalogenation of aryl chlorides and additive-free polymerization of acrylates. Alternatively, the QDs are functionalized with biphenyl ligands to store energy in long-lived, energetic triplets, enabling [2+2] homo-cycloaddition of styrene and cycloaddition of carbonyls with alkenes.
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