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. Author manuscript; available in PMC: 2011 Nov 17.
Published in final edited form as: J Am Chem Soc. 2010 Oct 26;132(45):15869–15871. doi: 10.1021/ja106244k

Figure 1.

Figure 1

(top) UV-vis spectra of compounds 1, 3, and 4 (−80 °C, DMF/THF). (middle) Resonance Raman difference spectrum (16O-18O) for compound 3 prepared from K16O2 or K18O2 (−196 °C, λex = 647 nm). (bottom) Resonance Raman spectra for compound 4 prepared from 3(16O) (black line) or 3(18O) (blue line), overlaid with spectrum of [(tmpa)2Cu2(16O2)](OTf)2 (red dotted line) (−196 °C, λex = 647 nm).