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(a) UV-vis spectrum of LMe2Cu-Ge[N(SiMe3)2]2 (1b) + O2 in toluene at -80 °C. (b) Resonance Raman spectra (λex = 488 nm) of frozen toluene solutions (77K) of LMeCu(μ-O)2Ge[N(SiMe3)2]2 (solid line for 16O2, dashed line for 18O2, * denotes solvent peaks).
