Volume 55, Issue 26 pp. 7432-7436
Communication

Redox Switching of Orthoquinone-Containing Aromatic Compounds with Hydrogen and Oxygen Gas

Kazuki Urakawa

Kazuki Urakawa

Division of Organic Chemistry, Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto, 860-8555 Japan

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Prof. Dr. Michinori Sumimoto

Prof. Dr. Michinori Sumimoto

Division of Computational Chemistry, Graduate School of Science and Engineering, Yamaguchi University, 2-16-1, Tokiwadai, Ube, Yamaguchi, 755-8611 Japan

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Prof. Dr. Mitsuhiro Arisawa

Prof. Dr. Mitsuhiro Arisawa

Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan

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Prof. Dr. Masaki Matsuda

Corresponding Author

Prof. Dr. Masaki Matsuda

Division of Physical Chemistry, Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto, 860-8555 Japan

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Prof. Dr. Hayato Ishikawa

Corresponding Author

Prof. Dr. Hayato Ishikawa

Division of Organic Chemistry, Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto, 860-8555 Japan

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First published: 04 May 2016
Citations: 27

Graphical Abstract

A tale with a twist: Unique redox switching of orthoquinone-containing pentacyclic aromatic compounds was observed upon exposure to H2 and O2 in the presence of a sulfur-modified gold-supported palladium nanoparticle catalyst (see picture). Switching between the orthoquinone and the corresponding hydroquinone led to a drastic change in the photoluminescence and color of the system owing to differences in the aromaticity and twist strain of the molecules.

Abstract

Unique redox switching of orthoquinone-containing pentacyclic aromatic compounds with molecular hydrogen and oxygen in the presence of a palladium nanoparticle catalyst (SAPd) is disclosed. These molecules were predicted by in silico screening before synthesis. Efficient protocols for the synthesis of orthoquinone-containing aromatic compounds by palladium-mediated homocoupling and the benzoin condensation reaction were developed. Clear switching between orthoquinone and aromatic hydroquinone compounds was observed on the basis of their photoluminescence properties. Furthermore, the twist strain of the orthoquinone moiety could induce dramatic changes in color and emission.

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