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Resonance Raman spectra of [(Me4pda)2Cu2(O)2](OTf)2 (20 mM in CH2Cl2) after addition of (a) Bu4NBF (60 eq.) or (b) Bu4NBA (10 eq.), for samples prepared from 16O2 (solid) or 18O2 (dotted). Conditions: λex = 406.7 nm, -196 °C. Solvent peaks are marked with an asterisk.
