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IR spectroelectrochemistry of [Re(3,3′-DHBPY)(CO)3Cl] in CO2-saturated THF/Bu4NPF6. (a) Reduction at R1, reductive deprotonation forming [Re(3,3′-DHBPY-H+)(CO)3Cl]− (↑). (b) Reduction at R2′, efficient electrocatalytic conversion of CO2 to CO, with a minor appearance of free bicarbonate. Inset: the reference 13CO2 satellite band. Asterisk indicates a minor amount of [Re(3,3′-DHBPY)(CO)3Cl]•– (cf. Figure 7).
