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. 2021 Jun 24;12:3940. doi: 10.1038/s41467-021-24261-y

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Structural diversity of PAHs and nanographenes. b Diversity-oriented synthesis of nanographenes by APEX-based growth-from-template method. Red, blue, and green hexagons represent newly constructed hexagons created by K-APEX, M-APEX, and bay-APEX reactions, respectively. c DAPEX strategy toward achieving the formal M-region-selective APEX reaction. Gray hexagons represent newly constructed hexagons created by the present M-APEX reaction. n number of hexagons contained in a nanographene or a PAH structure, N number of possible structures of nanographenes and PAHs.