Stepwise Generation of Mono-, Di-, and Triply-Reduced Warped Nanographenes: Charge-Dependent Aromaticity, Surface Nonequivalence, Swing Distortion, and Metal Binding Sites

Sarah N. Spisak, Zheng Zhou, Shuyang Liu, Qi Xu, Zheng Wei, Kenta Kato, Yasutomo Segawa, Kenichiro Itami, Andrey Yu Rogachev, Marina A. Petrukhina*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The stepwise chemical reduction of a molecular warped nanographene (WNG) having a negatively curved π-surface and defined C80H30 composition with Cs metal used as the reducing and complexing agent allowed the isolation of three different reduced states with one, two, and three electrons added to its π-conjugated system. This provided a unique series of nanosized carbanions with increasing negative charge for in-depth structural analysis of consequences of controlled electron charging of non-planar nanographenes, using X-ray crystallographic and computational tools. The 3D molecular electrostatic potential (MEP) maps identified the negative charge localization at the central part of the WNG surface where selective coordination of Cs+ ions is confirmed crystallographically. In-depth theoretical investigation revealed a complex response of the WNG to the stepwise electron acquisition. The extended and contorted π-surface of the WNG undergoes subtle swinging distortions that are accompanied by notable changes in the electronic structure and site-dependent aromaticity of the resulting carbanions.

Original languageEnglish
Pages (from-to)25445-25453
Number of pages9
JournalAngewandte Chemie - International Edition
Volume60
Issue number48
DOIs
Publication statusPublished - 2021 Nov 22
Externally publishedYes

Keywords

  • cesium
  • chemical reduction
  • DFT calculations
  • nanographenes
  • X-ray crystallography

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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