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. 2020 Sep 11;11:4567. doi: 10.1038/s41467-020-18371-2

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© The Author(s) 2020

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. 3 — a Not observed and observed resonance forms of polymer 3, featuring cis configuration. b High-resolution nc-AFM image of a section of the pentalene-bridged bisanthene polymer (left panel) and sketch illustrating the average bond lengths statistically measured from experimental nc-AFM images (central panel) and DFT calculation (right panel) of the bond lengths of a trans- section of the polymer. c NICS calculations of a pentalene-linked bisanthene dimer at distance of 1 Å above the center of each ring. d Calculated electronic structure of a freestanding cumulene-like bridged bisanthene polymer (3). e dI/dV scanning tunneling spectra acquired at selected site on polymer 3 and on Au(111) as indicated by stars in b. f Experimental and simulated dI/dV maps of the valence (VB) and conduction band (CB) of polymer 3.