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Updated: Jan 6, 2026

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
Published on: March 4, 2021
Pyrrole-Fused Aza-Nanographene with Two Gulf-Edge Regions as Flexible Sites
Takayuki Matsunaga1, Kosuke Oki1, Shigeki Mori2,3
1Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan.
Abstract:
A fused octapyrrolylanthracene, representing a nonplanar pyrrole-fused aza-nanographene with two deep gulf-edge regions, was readily synthesized and found to exhibit a ladder-shaped bent structure. Electrochemical studies revealed reversible multielectron oxidation up to four electrons. Stepwise oxidation with AgPF6 or I2 afforded a singlet diradical dication and a closed-shell aromatic tetracation. ESR spectroscopy indicated thermally populated diradical character, while NMR and ACID/NICS calculations confirmed global aromaticity in the tetracation.

