ChemRxiv
These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
1/1
4 files

Double-Helix Supramolecular Nanofibers Assembled from Negatively Curved Nanographenes

preprint
submitted on 22.11.2020, 03:46 and posted on 23.11.2020, 13:07 by Kenta Kato, Kiyofumi Takaba, Saori Maki-Yonekura, Nobuhiko Mitoma, Yusuke Nakanishi, Taishi Nishihara, Taito Hatakeyama, Takuma Kawada, Yuh Hijikata, Jenny Pirillo, Lawrence T. Scott, Koji Yonekura, Yasutomo Segawa, Kenichiro Itami
The layered structures of graphite and related nanographene molecules play key roles in their physical and electronic functions. However, the stacking modes of negatively curved nanographenes remains unclear, owing to the lack of suitable nanographene molecules. Herein we report the synthesis and one-dimensional supramolecular self-assembly of negatively curved nanographenes without any assembly-assisting substituents. This curved nanographene self-assembles in various organic solvents and acts as an efficient gelator. The formation of nanofibers was confirmed by microscopic measurements, and an unprecedented double-helix assembly by continuous π-π stacking was uncovered by three-dimensional electron crystallography. This work not only reports the discovery of an all-sp2-carbon supramolecular π-organogelator with negative curvature, but also demonstrates the power of three-dimensional electron crystallography for the structural determination of submicrometer-sized molecular alignment.

Funding

ERATO program from JST (JPMJER1302)

KAKENHI from MEXT (JP1905463)

KAKENHI from MEXT (JP16K05771)

KAKENHI from MEXT (JP19H02701)

KAKENHI from MEXT (JP19K22183)

A grant-in-aid for Scientific Research on Innovative Areas “π-Figuration” from the JSPS (JP17H05149)

Cyclic Innovation for Clinical Empowerment (CiCLE) from AMED

Toyoaki Scholarship Foundation

Daiko Foundation

US National Science Foundation (CHE-1149096)

History

Email Address of Submitting Author

itami@chem.nagoya-u.ac.jp

Institution

Nagoya University

Country

Japan

ORCID For Submitting Author

0000-0001-5227-7894

Declaration of Conflict of Interest

We have no conflict of interest to declare.

Licence

Exports