Catalyst Luminescence Exploited as an Inherent In Situ Probe of Photoredox Catalysis,ChemPhotoChem

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Catalyst Luminescence Exploited as an Inherent In Situ Probe of Photoredox Catalysis
ChemPhotoChem ( IF 3.0 ) Pub Date : 2019-10-22 , DOI: 10.1002/cptc.201900201
David J. Hayne ₁ , Sudip Mohapatra _{1,

2} , Joseph C. Bawden ₁ , Jacqui L. Adcock ₁ , Gregory J. Barbante _{1,

3} , Egan H. Doeven ₄ , Catherine L. Fraser ₁ , Timothy U. Connell _{1,

5} , Jonathan M. White ₆ , Luke C. Henderson ₇ , Paul S. Francis ₁

Affiliation

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.

中文翻译：

催化剂发光用作光氧化还原催化的固有原位探针

常用的光氧化还原催化剂的发光提供了电子或能量转移的连续固有原位探针，可以通过诸如CCD光谱仪或数码相机之类的光电检测器进行监测。该方法与补充的非原位实验一起应用，以三（2,2'-联吡啶）钌（II）为催化剂检测蒽的好氧氧化。该反应导致等轴测纯合成物的沉淀使用有机光催化剂时，以前的研究中未见到四环氧化物。不仅在催化剂的电子/能量转移猝灭时观察到发射的变化，而且还观察到颗粒（未溶解的底物和沉淀的产物）的存在。这些特征赋予不相似的光谱分布，可以通过它们对数字图像的RGB数据的相对贡献来区分。因此，该方法能够询问反应的多个方面以进行监控和优化，并提供对光氧化还原催化系统机理的独特见解。

更新日期：2019-10-22

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