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. Author manuscript; available in PMC: 2022 Aug 1.
Published in final edited form as: Chem Rev. 2022 Jan 25;122(14):12207–12243. doi: 10.1021/acs.chemrev.1c00915

Figure 15.

Figure 15.

The DR-UV-vis spectra of A: the O2 precursor that grows in (indicated by the arrow) upon exposure with O2 at room temperature and B: the spectral changes that occur when the O2 precursor is heated to form the [Cu2O]2+ active site. The arrows in B show the band around 29000 cm−1 decreases while the band around 22500 cm−1 increase upon heating. The rR spectrum of the 363.8 nm excitation of the O2 precursor is shown in C defining this site to be a μ-(η2:η2) peroxo dicopper(II) intermediate. Adapted with permission from ref 27. Copyright 2010 American Chemical Society.