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. 2019 Jul 11;10:3057. doi: 10.1038/s41467-019-11098-9

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© The Author(s) 2019

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. 2 — Nuclear magnetic resonance (NMR) characterization of molecular bilayer graphene. a, e The top views of 1 and 2, respectively. The asymmetric units in 1 and 2 are highlighted in blue. In and out represents the inward-spacing and outward-spacing methyl of the mesityl group. b, f The side views of 1 and 2. c, g Numeration of hydrogen atoms in the asymmetric units of 1 and 2, respectively. d, h ¹H NMR spectra of 1 and 2. The theoretical NMR spectra of 1 and 2 are represented as orange lines. All of the proton resonances are assigned with the assistance of two-dimensional NMR spectroscopy (Supplementary Figs. 21–32 and Supplementary Note 2)