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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. 3 — a Overlaid solid-state DR UV-vis spectra illustrating the light-induced spectral changes of the COF before (black trace) and after (red trace) exposure to 365 nm UV light irradiation, inset images of TTA-SPDFP COF showing the reversible color change upon UV- light irradiation. b Overlaid FT-IR spectra of the as-synthesized TTA-SPDFP COF (black trace) and the TTA-MCDFP COF (red trace) following UV light irradiation. The significant change in the C-O_spiro vibration band upon UV irradiation is shaded in yellow. c Overlaid one-dimensional ¹³C CPMAS NMR spectra depicting the spectral changes of TTA-SPDFP COF before (black) and after photoisomerization (red). d Overlay of the two-dimensional ¹H-¹³C heteronuclear correlation (CPMAS NMR) spectra of TTA-MCDFP COF (red) and TTA-SPDFP COF (black). Both spectra were obtained using a MAS frequency of 14 kHz at 600 MHz (¹H Larmor frequency). Spinning side bands are indicated by asterisks. e Changes in the surface contact angle of TTA-SPDFP COF before and after UV light irradiation for 5 min followed by visible-light (450 nm) irradiation for 8 h.