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. Author manuscript; available in PMC: 2020 Jul 1.
Published in final edited form as: Angew Chem Int Ed Engl. 2019 May 22;58(27):9114–9119. doi: 10.1002/anie.201903749

Figure 1.

Figure 1

VtC XES of [(Me3TACN)2Cu2(µ-O)2]2+ (red) and [(DBED)2Cu2(µ-η2:η2-O2)]2+ (blue). Both VtC XES intensities are normalized to the Kβ mainline energy (not shown) integrated area of 1. The difference of the two spectra ([(Me3TACN)2Cu2(µ-O)2]2+ – [(DBED)2Cu2(µ-η2:η2-O2)]2+) is exhibited below (black) with a dashed horizontal guideline at zero intensity. [(DBED)2Cu2(µ-η2:η2-O2)]2+ exhibits a unique shoulder at the low energy side of its Kβ2,5 peak (~8970 eV) that appears as a negative peak in the difference spectrum. A broad Kβ’’ feature for [(Me3TACN)2Cu2(µ-O)2]2+ is observed centered at ~8961 eV that also appears as a broad positive peak in the difference spectrum.