Two molecules of CO2 add to electrochemically reduced 9,10-phenanthrenequinone (PAQ) in CH3CN/[n-Bu4N]BF4 to give the bis(carbonate), [PAQ -2CO2] 2-. In the absence of CO2, PAQ undergoes two reversible, one-electron reductions at -0.65 and -1.44V vs. SCE in CH~CN. Addition of CO2 occurs at --0.7V vs. SCE with a rate constant of about 102 M~s-L A
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