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Helical Graphene Nanostructures Embedded with an Azulene Cluster

preprint
submitted on 10.04.2020 and posted on 13.04.2020 by Yousuke Yamaoka, Naoki Ogawa, Hiroshi Takikawa, Ken-ichi Yamada, Kiyosei Takasu
An azulene cluster is a structural defect of graphenes, and it alters the electronic, magnetic, and structural properties of graphenes and graphene nanoribbons. However, detailed experimental investigations of graphenes or graphene nanostructures embedded with an azulene cluster are limited because they are difficult to synthesise. Herein, azulene-embedded graphene nanostructures (AGNs) were synthesised by following a newly developed synthetic protocol. The nanostructures comprising pentagons, hexagons, and heptagons has three characteristic edges, viz., zigzag-, armchair-, and cove-type edges. Experimental and theoretical investigations of the properties of AGN revealed that the cove edge has stable helical chirality with a racemisation barrier of 29.2 kcal/mol, in contrast to normal cove-type edges that undergo rapid racemisation. The in-solution self-association behaviour and the structural, electronic, and electrochemical properties of AGN are also described in detail.

Funding

JSPS KAKENHI

Platform for Drug Design, Discovery and Development grant from MEXT

Sasakawa Scientific Research Grant

JSPS for a research fellowship for young scientists

History

Email Address of Submitting Author

kay-t@pharm.kyoto-u.ac.jp

Institution

Kyoto University

Country

Japan

ORCID For Submitting Author

0000-0002-1798-7919

Declaration of Conflict of Interest

No conflict of interest

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