+ undergo one, reversible reduction at E 1/2 = −1.65 V and −1.51 V, respectively, and one

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Multielectron reduction of CO 2 and CO to afford highly reduced organic molecules has a fundamental importance in the utilization of C 1 resources. A number of metal complexes have been proven to work as catalyst precursors in photo- [1] and electrochemical [2] reduction of CO 2 , although the reduction products are limited to CO and HCOOH as twoelectron-reduced products. The generation of CO occurs by reductive cleavage of metalÀCO bonds derived from M-h 1 -CO 2 and M-h 1 -CO(O)H complexes in protic media. The