Efficient photocatalytic proton-coupled electron-transfer reduction of O2 using a saddle-distorted porphyrin as a photocatalyst

Emi Aoki; Wataru Suzuki; Hiroaki Kotani; Tomoya Ishizuka; Hayato Sakai; Taku Hasobe; Takahiko Kojima

doi:10.1039/C9CC01547G

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Efficient photocatalytic proton-coupled electron-transfer reduction of O₂ using a saddle-distorted porphyrin as a photocatalyst†

Emi Aoki,^a Wataru Suzuki,^a Hiroaki Kotani,

^a Tomoya Ishizuka,^a Hayato Sakai,^b Taku Hasobe

^b and Takahiko Kojima

*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba and CREST (JST), 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
E-mail: kojima@chem.tsukuba.ac.jp

^b Department of Chemistry, Faculty of Science and Technology, Keio University, Yokohama, Japan

Abstract

Photocatalytic O₂ reduction reactions proceeded to produce H₂O₂ using a diprotonated saddle-distorted dodecaphenylporphyrin as a photocatalyst. The quantum yield (12%), the turnover number (3000 for 6 h), and the turnover frequency (500 h⁻¹) are achieved in photocatalytic systems based on free-base porphyrins for the first time. The photocatalytic reaction mechanism has been revealed by ns-laser flash photolysis and kinetic analysis.

This article is part of the themed collection: Frontiers in Proton Coupled Electron Transfer (PCET)

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Article information

DOI: https://doi.org/10.1039/C9CC01547G
Article type: Communication
Submitted: 23 Nah 2019
Accepted: 29 Cig 2019
First published: 29 Cig 2019

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Chem. Commun., 2019,55, 4925-4928

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Efficient photocatalytic proton-coupled electron-transfer reduction of O₂ using a saddle-distorted porphyrin as a photocatalyst

E. Aoki, W. Suzuki, H. Kotani, T. Ishizuka, H. Sakai, T. Hasobe and T. Kojima, Chem. Commun., 2019, 55, 4925 DOI: 10.1039/C9CC01547G

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Chemical Communications