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Issue 10, 2015
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Characterizing chain processes in visible light photoredox catalysis

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Abstract

The recognition that Ru(bpy)32+ and similar visible light absorbing transition metal complexes can be photocatalysts for a variety of synthetically useful organic reactions has resulted in a recent resurgence of interest in photoredox catalysis. However, many of the critical mechanistic aspects of this class of reactions remain poorly understood. In particular, the degree to which visible light photoredox reactions involve radical chain processes has been a point of some disagreement that has not been subjected to systematic analysis. We have now performed quantum yield measurements to demonstrate that three representative, mechanistically distinct photoredox processes involve product-forming chain reactions. Moreover, we show that the combination of quantum yield and luminescence quenching experiments provides a rapid method to estimate the length of these chains. Together, these measurements constitute a robust, operationally facile strategy for characterizing chain processes in a wide range of visible light photoredox reactions.

Graphical abstract: Characterizing chain processes in visible light photoredox catalysis

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Article information


Submitted
17 Jun 2015
Accepted
07 Jul 2015
First published
07 Jul 2015

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2015,6, 5426-5434
Article type
Edge Article
Author version available

Characterizing chain processes in visible light photoredox catalysis

M. A. Cismesia and T. P. Yoon, Chem. Sci., 2015, 6, 5426
DOI: 10.1039/C5SC02185E

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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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    [Original citation] - Published by The Royal Society of Chemistry.

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