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Issue 21, 2015
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Generating hydrated electrons through photoredox catalysis with 9-anthrolate

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Abstract

Hydrated electrons are among the strongest reductants known. Adding the ascorbate dianion as a sacrificial donor turns the photoionization of 9-anthrolate in water into a catalytic cycle for their in situ production with near-UV light (355 nm). The photoionization step is exclusively biphotonic and occurs via the first excited singlet state of the catalyst. Neither triplet formation nor any photochemical side reactions interfere. The ionization by-product, the anthroxy radical, is inert towards the ascorbate monoanion but is rapidly reduced by the dianion, thereby recovering the starting catalyst. A sufficient amount of the sacrificial donor makes that reduction quantitative and leads to a sustainable generation of hydrated electrons, as is evidenced by electron yields greatly surpassing the catalyst concentration. Control experiments established that the superincrease is indeed due to the catalyst regeneration and not to an ionization of other species involved in the reaction.

Graphical abstract: Generating hydrated electrons through photoredox catalysis with 9-anthrolate

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Publication details

The article was received on 24 Mar 2015, accepted on 20 Apr 2015 and first published on 23 Apr 2015


Article type: Paper
DOI: 10.1039/C5CP01711D
Phys. Chem. Chem. Phys., 2015,17, 13829-13836
  • Open access: Creative Commons BY-NC license
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    Generating hydrated electrons through photoredox catalysis with 9-anthrolate

    C. Kerzig and M. Goez, Phys. Chem. Chem. Phys., 2015, 17, 13829
    DOI: 10.1039/C5CP01711D

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