Volume 131, Issue 40 pp. 14457-14464
Forschungsartikel

Dearomatization Approach Toward a Superbenzoquinone-Based Diradicaloid, Tetraradicaloid, and Hexaradicaloid

Dr. Guangwu Li

Dr. Guangwu Li

Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Singapore

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Yi Han

Yi Han

Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Singapore

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Ya Zou

Ya Zou

Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Singapore

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Johnathan Joo Cheng Lee

Johnathan Joo Cheng Lee

Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Singapore

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Dr. Yong Ni

Dr. Yong Ni

Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Singapore

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Prof. Jishan Wu

Corresponding Author

Prof. Jishan Wu

Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Singapore

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First published: 08 August 2019
Citations: 10

Abstract

Reported here is the step-by-step dearomatization of a highly aromatic polycyclic aromatic hydrocarbon (PAH), the hexa-peri-hexabenzocoronene (also called as “superbenzene”), to give a series of superbenzoquinones containing two, four, and six ketone groups. Different from traditional PAH-based quinones, these superbenzoquinones show open-shell multiradical character by rearomatization in the open-shell forms as experimentally validated by X-ray crystallographic analysis, NMR and ESR spectroscopy, and FT-IR measurements, as well as theoretically supported by restricted active space spin-flip calculations. These compounds exhibit structure- and molecular-symmetry-dependent optical, electrochemical, and magnetic properties.

Conflict of interest

The authors declare no conflict of interest.

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