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Cathodic IR spectroelectrochemistry of [Re(3,3′-DHBPY)(CO)3Cl] (↓) in PrCN/Bu4NPF6 at 258 K. (a) Conversion of the parent complex to [Re(3,3′-DHBPY-H+)(CO)3Cl]− (↑) at R1. (b) Reductive transformation of [Re(3,3′-DHBPY-H+)(CO)3Cl]− (↓) at R2′ to transient [Re(3,3′-DHBPY-2H+)(CO)3Cl]2–, denoted by ●, and dominant [Re(3,3′-DHBPY-2H+)(CO)3(PrCN)]3–, denoted by ⧫.
