Catalyst luminescence exploited as an inherent in situ probe of photoredox catalysis
journal contributionposted on 2020-01-01, 00:00 authored by David HayneDavid Hayne, Sudip Mohapatra, Joseph BawdenJoseph Bawden, Jacqui AdcockJacqui Adcock, Gregory Barbante, Egan DoevenEgan Doeven, Catherine Fraser, Tim ConnellTim Connell, Jonathan M White, Luke HendersonLuke Henderson, Paul FrancisPaul Francis
The luminescence of commonly used photoredox catalysts offers a continuous inherent in situ probe of electron or energy transfer that can be monitored by photodetectors such as a CCD spectrometer or a digital camera. This approach was applied with complementary ex situ experiments to examine the aerobic oxidation of anthracene with tris(2,2′‐bipyridine)ruthenium(II) as the catalyst. The reaction results in the precipitation of an isometrically pure syn‐tetraepoxide not seen in prior studies when an organic photocatalyst was employed. Changes in the emission were observed not only upon electron/energy transfer quenching of the catalyst but also from the presence of particles (undissolved substrate and precipitated product). These features impart dissimilar spectral distributions that can be discriminated by their relative contributions to the RGB data of the digital images. The approach thus enables interrogation of multiple facets of the reaction for monitoring and optimization, and offers unique insight into the mechanisms of photoredox catalysis systems.
Pagination105 - 109
Publication classificationC1 Refereed article in a scholarly journal
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9-MESITYL-10-METHYLACRIDINIUM IONANTHRACENESChemistryChemistry, PhysicalDIELS-ALDERelectron transferELECTRON-TRANSFERENERGYluminescencephotocatalysisPHOTOCHEMICAL-TRANSFORMATIONSPhysical SciencesPOLYCYCLIC AROMATIC-HYDROCARBONSreaction monitoringScience & TechnologySENSITIZATIONSTATEtransition metal catalystsVISIBLE-LIGHT PHOTOCATALYSIS