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. Author manuscript; available in PMC: 2014 Oct 30.
Published in final edited form as: J Am Chem Soc. 2013 Oct 17;135(43):16148–16160. doi: 10.1021/ja406721a

Figure 3.

Figure 3

UV/Vis spectra of a solution of [FurNeu](Cu(NCCH3))2(OTf)2, 3, dissolved in acetonitrile (2 mM) before (yellow line) and 20 min after the reaction with O2 (blue line); employing PhIO as the oxidant an analogous spectrum with a somewhat higher absorbance is obtained (see SI, Figure S5). The dotted grey line represents the UV/Vis absorption behavior of a solution of [FurNeu](Cu)2(OTf)4, 4, in acetonitrile (2 mM). The reported extinction coefficient of the oxygenation product of 3 is based on the PhIO reaction. The inset shows the spectral changes associated with the oxidation of 3 in the ultra-violet region, the investigation of which required a reduction of the concentration to 0.1 mM.