日本名古屋大学Kenichiro Itami团队报道了由负弯曲纳米石墨烯组装的双螺旋超分子纳米纤维。 相关研究成果发表在2021年3月24日出版的《美国化学会杂志》。

石墨及其相关纳米石墨烯分子的层状结构对其物理和电子功能起着关键作用。然而，由于缺乏合适的纳米石墨烯分子，负弯曲纳米石墨烯的堆叠形式仍然不清楚。

该文中，研究人员报道了无任何辅助组装取代基的负弯曲纳米石墨烯的合成和一维超分子的自组装。这种弯曲的纳米石墨烯可以在各种有机溶剂中自组装，起到高效凝胶剂的作用。微观测量证实了纳米纤维的形成，三维电子晶体学揭示了一种前所未有的连续π-π堆积的双螺旋结构。

该工作不仅发现了一种具有负曲率的全sp2-碳超分子π-有机凝胶剂，而且证明了三维电子晶体学在亚微米级分子排列结构测定中的作用。

附：英文原文

Title: Double-Helix Supramolecular Nanofibers Assembled from Negatively Curved Nanographenes

Author: 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

Issue&Volume: March 24, 2021

Abstract: 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 remain 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.

DOI: 10.1021/jacs.1c00863

Source: https://pubs.acs.org/doi/10.1021/jacs.1c00863