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. 2021 Nov 24;12:6818. doi: 10.1038/s41467-021-27090-1

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© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 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 The structures of the AQM ditriflates, 1–4, studied herein. Monomers 1–3 underwent topochemical polymerization under the effects of heat and/or light to produce polymers P1–P3. NR: no reaction. b–c Photographs and optical microscope images of vials containing crystals of (b) 1 and (c) P1, showing the typical morphology of crystals. Scale bar: 1 mm. d–f ¹³C-NMR spectra of polymers P1–P3. Cross-polarization/magic angle spinning (CP/MAS) solid-state ¹³C-NMR spectra of (d) P1, and (e) P2 (asterisks denote spinning side bands). (f) Solution ¹³C-NMR spectrum of P3 (solvent: CDCl₃). All carbon resonances are annotated by colored circles. The resonances in d–f between 49–53 ppm (red) indicate the presence of the sp³ carbons generated during polymerization, and the CF₃ multiplets (expected ratio of 1:3:3:1, but only the two highest peaks are observed) between 117 and 120 ppm (orange) show that the triflate groups remain intact.