Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 39, Pages 21100-21115Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202100270
Keywords
3d transition metals; dissociative ligand-to-metal charge transfer; inner-sphere electron transfer; photoredox catalysis; visible-light-induced homolysis
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Funding
- DFG [RE948/18-1]
- European Unions Framework Programme for Research and Innovation Horizon 2020 under the Marie Sklodowska-Curie Grant [795161]
- Projekt DEAL
- Marie Curie Actions (MSCA) [795161] Funding Source: Marie Curie Actions (MSCA)
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The mainstream applications of visible-light photoredox catalysis mainly involve precious metal Ru-II or Ir-III complexes or organic dyes with low photostability. Earth-abundant metal-based (MLn)-L-n-type complexes are evolving rapidly as alternative photocatalysts that offer economic and ecological advantages and access to complementary inner-sphere mechanistic modes, transcending the inherent limitations of ultrashort excited-state lifetimes. The process of visible-light-induced homolysis (VLIH) involves the formation of light-absorbing ligated metal-substrate complexes that undergo homolytic cleavage for further transformations.
The mainstream applications of visible-light photoredox catalysis predominately involve outer-sphere single-electron transfer (SET) or energy transfer (EnT) processes of precious metal Ru-II or Ir-III complexes or of organic dyes with low photostability. Earth-abundant metal-based (MLn)-L-n-type (M=metal, L-n=polydentate ligands) complexes are rapidly evolving as alternative photocatalysts as they offer not only economic and ecological advantages but also access to the complementary inner-sphere mechanistic modes, thereby transcending their inherent limitations of ultrashort excited-state lifetimes for use as effective photocatalysts. The generic process, termed visible-light-induced homolysis (VLIH), entails the formation of suitable light-absorbing ligated metal-substrate complexes ((MLn)-L-n-Z; Z=substrate) that can undergo homolytic cleavage to generate Mn-1Ln and Z(.) for further transformations.
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