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. Author manuscript; available in PMC: 2018 May 30.
Published in final edited form as: J Am Chem Soc. 2017 Mar 20;139(12):4477–4485. doi: 10.1021/jacs.7b00210

Figure 2.

Figure 2

rR spectra of 1 (red, ν(Cu–O) = 633 cm−1), 18O-enriched 1 (black, ν(Cu–O) = 607 cm−1), and the difference spectrum (blue, 16O–18O), using λex = 515 nm, CH2Cl2 solutions at 77 K.