Fully conjugated azacorannulene dimer as large diaza[80]fullerene fragment

Weifan Wang, Fiona Hanindita, Yosuke Hamamoto, Yongxin Li and Shingo Ito ()
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Weifan Wang: Nanyang Technological University
Fiona Hanindita: Nanyang Technological University
Yosuke Hamamoto: Nanyang Technological University
Yongxin Li: Nanyang Technological University
Shingo Ito: Nanyang Technological University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract A fully conjugated azacorannulene dimer with a large π-surface (76π system) was successfully synthesized from a fully conjugated bifunctional polycyclic aromatic azomethine ylide. This molecule represents an example of diaza[80]fullerene (C78N2) fragment molecule bearing two internal nitrogen atoms. X-ray crystallography analysis shows its boat-shaped structure with two terminal azacorannulenes bent in the same direction. The molecular shape leads to unique selective association with a dumbbell-shaped C60 dimer (C120) over C60 through shape recognition. Owing to its large π-surface and a narrow HOMO–LUMO gap, the azacorannulene dimer exhibits red fluorescence with a quantum yield of up to 31%. The utilization of the fully conjugated bifunctional azomethine ylide is a powerful method for the bottom-up synthesis of large multiazafullerene fragments, providing a step towards the selective total synthesis of multiazafullerenes.

Date: 2022
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DOI: 10.1038/s41467-022-29106-w

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