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. 2023 Jun 23;14:3765. doi: 10.1038/s41467-023-39402-8

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© The Author(s) 2023

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 Synthetic scheme for obtaining TTA-SPDFP COF under ultrasonic waves at room temperature in 3 mL of 1,4-dioxane. b, c Powder X-ray diffraction (PXRD) patterns of the TTA-SPDFP COF and TTA-MCDFP COF. The insets show the cartoon images of the spiropyran and merocyanine. d, e Simulated crystal structures that resulted from an eclipsed AA stacking model of TTA-SPDFP and TTA-MCDFP COFs. For proton assignment of the NMR spectrum, see Supplementary Fig. 3a.