Volume 134, Issue 8 e202113203
Forschungsartikel

A Near-Infrared Absorbing and Emissive Quadruple Helicene Enabled by the Scholl Reaction of Perylene

Dr. Sai Ho Pun

Dr. Sai Ho Pun

Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

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Ka Man Cheung

Ka Man Cheung

Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

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Daiyue Yang

Daiyue Yang

Shanghai-Hong Kong Joint Laboratory in Chemical Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 230032 China

Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, China

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Dr. Han Chen

Dr. Han Chen

Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

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Dr. Yujing Wang

Dr. Yujing Wang

Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

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Stephen V. Kershaw

Stephen V. Kershaw

Department of Materials Science and Engineering and Centre for Functional Photonics (CFP), City University of Hong Kong, Hong Kong, China

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Prof. Qian Miao

Corresponding Author

Prof. Qian Miao

Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

Shanghai-Hong Kong Joint Laboratory in Chemical Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 230032 China

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First published: 17 December 2021
Citations: 16

Abstract

Herein, we report the synthesis, structural analysis, optical and chiroptical properties of a novel quadruple helicene, which has two [6] and two [7]helicene moieties fused in a contorted framework of 92 sp2 carbon atoms. It was synthesized by the Scholl reaction of a perylene-containing substrate with the formation of eight carbon-carbon bonds on the perylene unit in a single synthetic operation. Chemical oxidation of the quadruple helicene with tris(4-bromophenyl)ammoniumyl hexachloroantimonate resulted in an air-stable dication, which exhibits the same helicity in its four helicene moieties as unambiguously identified by single-crystal X-ray crystallography. The quadruple helicene exhibits unusual near-infrared absorption and emission with absorption and emission maxima at 848 nm and 977 nm, respectively, and its isolated enantiomers exhibit electronic circular dichroism in the near-infrared and visible-light regions.

Conflict of interest

The authors declare no conflict of interest.

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