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. 2021 Aug 20;7(34):eabh0250. doi: 10.1126/sciadv.abh0250

Fig. 4. Tr-XES analysis reveals superoxide formation.

Fig. 4

(A) Fe Ka1,2 XES of anaerobic IPNS:Fe:ACV microcrystals (red), after 1600-ms O2 exposure (black); a difference spectrum between the two (blue, 5× enlarged) and a difference spectrum between 10 mM solutions of Fe(III)Cl3 and Fe(II)Cl2 (green, 2× enlarged). a.u., arbitrary units. (B) Full width at half maximum (FWHM) of the Fe Kα1 XES peak following O2 exposure. Early times (≤800 ms) show only small changes in the FWHM (+/− 0.03 eV); the 1600- and 3000-ms times show a shift by ~0.1 eV, indicating Fe oxidation. (C) 2mFo-DFc map of the IPNS:Fe3+:ACV:O2⸣●− complex (PDB: 6ZAI).