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. 2024 Mar 8;16(7):1133–1140. doi: 10.1038/s41557-024-01477-1

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© The Author(s) 2024

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — a, Synthesis of PGNRs, with the porphyrin and graphene nanoribbon moieties highlighted in pink and blue, respectively. b, Analytical GPC traces of Yamamoto polymerization products of dichloroporphyrin 2b from reaction in DMF/toluene (1:1, v/v), DMF and THF (eluent: THF/1% pyridine, flow rate = 1 ml min^–1, detection at 430 nm). Peaks are labelled with N, the number of repeat units. c, MALDI-TOF mass spectrum of PPb measured with trans-2-[3-(4-tert-butylphenyl)-2-methyl-2-propenylidene]malononitrile (DCTB) as the matrix, conducted in the linear mode. Peaks from the polymer extend up to a molecular weight of 210 kDa (102 repeat units) and the average m/z difference between neighbouring peaks corresponds to one repeat unit. d, STM topograph of PPa transferred from toluene solution to a Au(111) surface via electro-spray deposition, and subsequently annealed to 250 °C (T_sample = 4.7 K, V_sample-bias = 2 V, I_set-point = 50 pA). e, CP-MAS solid-state ¹H-NMR spectra of PPb in comparison with PGNRb, and the integration of protons in the aromatic and aliphatic regions.

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