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. 2023 Oct 20;14:6666. doi: 10.1038/s41467-023-42337-9

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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. 2 — Fe K-edge (a) and Zn K-edge (b) normalized X-ray absorption near-edge structure (XANES) spectra. Fourier transform of k-weighted Fe K-edge (c) and k²-weighted Zn K-edge (d) EXAFS spectra. e, f EXAFS fitting of the Fe-ZIF-8-800 at Fe and Zn K-edges. g Experimental Fe K-edge XANES spectra of Fe-ZIF-8-800 and theoretical spectra of porphyrin-based Fe(II)-N₃C₁₀ moiety. h Experimental Zn K-edge XANES spectra of ZIF-8-800 and theoretical spectra of the porphyrin-based Zn(II)-N₄C₁₂ moiety. The number in the bracket represents the formal oxidation state of the metal center. i Wavelet transform of Fe K-edge EXAFS for Fe-ZIF-8-800 and Zn K-edge EXAFS for Fe-ZIF-8-800 and ZIF-8-800. Insets: atomic structure models of Fe SAs/N-C; Fe (orange), Zn (light blue), N (blue), and C (gray).