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Cathodic IR spectroelectrochemistry of [Re(3,3′-DHBPY)(CO)3Cl] (↓) in PrCN/Bu4NPF6 at 223 K. The parent complex undergoes two successive reductive deprotonations yielding [Re(3,3′-DHBPY-H+)(CO)3Cl]− (↑↓) at R1, and [Re(3,3′-DHBPY-2H+)(CO)3Cl]2– (↑) at R2′. The label ⧫ indicates the presence of a small amount of [Re(3,3′-DHBPY-2H+)(CO)3(PrCN)]3– as a secondary product resulting from the dissociation of the Re–Cl bond in the double-deprotonated precursor complex.
