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. Author manuscript; available in PMC: 2018 Jan 2.
Published in final edited form as: Angew Chem Int Ed Engl. 2016 Dec 1;56(1):297–301. doi: 10.1002/anie.201607611

Figure 1.

Figure 1

A: Absorption spectra of 2–4 at −78 °C in toluene. B–D: rRaman spectra (413 nm excitation) of 2–4 in toluene at −90 °C: B. 3-16O2 in d8-toluene (solid trace) and 3-18O2 in toluene (dash-dotted trace). C: 2-16O2 in d8-toluene (solid trace) and 2-18O2 in toluene (dash-dotted trace). D: 4-16O2 in d8-toluene (solid trace) and 4-18O2 in d8-toluene (dashed trace). See also Fig S22.